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Fix period test to recognize actual sink address

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lash 2023-02-10 16:17:06 +00:00
parent e6eef48808
commit 5c85a8abba
Signed by: lash
GPG Key ID: 21D2E7BB88C2A746
11 changed files with 20 additions and 2198 deletions
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6
python/CHANGELOG
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@ -1,3 +1,9 @@
- 0.3.0
* Smart contracts use abdk math libraries, all exponential operations are static gas cost
* Add expiry features, after which balances are frozen and no more transfers or demurrage will occur
* Add sealable features for supply, sink address, expiry and minters (when sealed cannot be changed)
* Deployer script now takes demurrage amount as ppm instead of literal growth fraction
* Retire old multi and cap contracts
- 0.1.1 - 0.1.1
* Settable demurrage steps for apply demurrage cli tool * Settable demurrage steps for apply demurrage cli tool
- 0.1.0 - 0.1.0

2
python/erc20_demurrage_token/data/DemurrageTokenSingleNocap.bin
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File diff suppressed because one or more lines are too long

51
python/run_tests.sh
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@ -1,47 +1,14 @@
#!/bin/bash #!/bin/bash
set -x set -a
set -e set -e
set -x
export PYTHONPATH=. default_pythonpath=$PYTHONPATH:.
export PYTHONPATH=${default_pythonpath:-.}
#modes=(MultiNocap MultiCap SingleCap SingleNocap) >&2 echo using pythonpath $PYTHONPATH
#modes=(SingleCap SingleNocap) # other contracts need to be updted for f in `ls tests/*.py`; do
modes=(SingleNocap) # other contracts need to be updted python $f
for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_basic.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_growth.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_amounts.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_single.py
done done
#modes=(SingleCap) # other contracts need to be updted
modes=()
for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_period.py
done
modes=(SingleNocap) # other contracts need to be updted
for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution_unit.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution_single.py
done
#modes=(MultiCap SingleCap)
modes=()
for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_cap.py
done
#modes=(MultiCap MultiNocap)
#for m in ${modes[@]}; do
# ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_remainder.py
# ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution.py
#done
python tests/test_expiry.py
python tests/test_seal.py
python tests/test_cap.py
set +e
set +x set +x
set +e
set +a

41
python/tests/test_demurrage_ext.py
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@ -1,41 +0,0 @@
# standard imports
import datetime
import unittest
# external imports
from chainlib.eth.nonce import RPCNonceOracle
# local imports
from erc20_demurrage_token import DemurrageToken
from erc20_demurrage_token.demurrage import DemurrageCalculator
# test imports
from erc20_demurrage_token.unittest.base import TestDemurrage
class TestEmulate(TestDemurrage):
def test_amount_since(self):
d = datetime.datetime.utcnow() - datetime.timedelta(seconds=29, hours=5, minutes=3, days=4)
c = DemurrageCalculator(0.00000050105908373373)
a = c.amount_since(100, d.timestamp())
self.assert_within_lower(a, 99.69667, 0.1)
def test_amount_since_slow(self):
d = datetime.datetime.utcnow() - datetime.timedelta(seconds=29, hours=5, minutes=3, days=4)
c = DemurrageCalculator(0.00000050105908373373)
a = c.amount_since_slow(100, d.timestamp())
self.assert_within_lower(a, 99.69667, 0.1)
def test_from_contract(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
self.deploy(c, 'SingleNocap')
dc = DemurrageCalculator.from_contract(self.rpc, self.chain_spec, self.address, sender_address=self.accounts[0])
self.assertEqual(dc.r_min, 0.02)
if __name__ == '__main__':
unittest.main()

4
python/tests/test_period.py
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@ -172,7 +172,7 @@ class TestPeriod(TestDemurrageDefault):
r = self.rpc.do(o) r = self.rpc.do(o)
self.assertEqual(r['status'], 1) self.assertEqual(r['status'], 1)
o = c.balance_of(self.address, ZERO_ADDRESS, sender_address=self.accounts[0]) o = c.balance_of(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o) r = self.rpc.do(o)
balance = c.parse_balance_of(r) balance = c.parse_balance_of(r)
self.assertGreater(balance, 0) self.assertGreater(balance, 0)
@ -222,7 +222,7 @@ class TestPeriod(TestDemurrageDefault):
r = self.rpc.do(o) r = self.rpc.do(o)
self.assertEqual(r['status'], 1) self.assertEqual(r['status'], 1)
o = c.balance_of(self.address, ZERO_ADDRESS, sender_address=self.accounts[0]) o = c.balance_of(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o) r = self.rpc.do(o)
balance = c.parse_balance_of(r) balance = c.parse_balance_of(r)
self.assertLess(balance, old_sink_balance) self.assertLess(balance, old_sink_balance)

328
python/tests/test_redistribution.py
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@ -1,328 +0,0 @@
# standard imports
import os
import unittest
import json
import logging
# external imports
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.tx import receipt
from chainlib.eth.block import (
block_latest,
block_by_number,
)
from chainlib.eth.address import to_checksum_address
from hexathon import (
strip_0x,
add_0x,
)
# local imports
from erc20_demurrage_token import DemurrageToken
# test imports
from erc20_demurrage_token.unittest.base import TestDemurrageDefault
logging.basicConfig(level=logging.DEBUG)
logg = logging.getLogger()
testdir = os.path.dirname(__file__)
class TestRedistribution(TestDemurrageDefault):
def test_whole_is_parts(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 100000000)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[2], 100000000)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.transfer(self.address, self.accounts[1], self.accounts[3], 50000000)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
self.backend.time_travel(self.start_time + self.period_seconds + 1)
o = block_latest()
r = self.rpc.do(o)
o = block_by_number(r)
r = self.rpc.do(o)
self.assertEqual(r['timestamp'], self.start_time + self.period_seconds)
(tx_hash, o) = c.change_period(self.address, self.accounts[1])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.apply_redistribution_on_account(self.address, self.accounts[1], self.accounts[1])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
balance = 0
for i in range(3):
o = c.balance_of(self.address, self.accounts[i+1], sender_address=self.accounts[0])
r = self.rpc.do(o)
balance_item = c.parse_balance_of(r)
balance += balance_item
logg.debug('balance {} {} total {}'.format(i, balance_item, balance))
o = c.balance_of(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
balance_item = c.parse_balance_of(r)
balance += balance_item
self.assertEqual(balance, 200000000)
# def test_debug_periods(self):
# nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
#
# o = c.actual_period(self.address, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# pactual = c.parse_actual_period(r)
#
# o = c.period_start(self.address, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# pstart = c.parse_actual_period(r)
#
# o = c.period_duration(self.address, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# pduration = c.parse_actual_period(r)
#
# o = block_latest()
# blocknumber = self.rpc.do(o)
#
# logg.debug('actual {} start {} duration {} blocknumber {}'.format(pactual, pstart, pduration, blocknumber))
#
#
# # TODO: check receipt log outputs
# def test_redistribution_storage(self):
# nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# o = c.redistributions(self.address, 0, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# self.assertEqual(strip_0x(r), '000000000000000000000000f424000000000000000000000000000000000001')
#
# (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 1000000)
# r = self.rpc.do(o)
#
# (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[2], 1000000)
# r = self.rpc.do(o)
#
# external_address = to_checksum_address('0x' + os.urandom(20).hex())
#
# nonce_oracle = RPCNonceOracle(self.accounts[2], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.transfer(self.address, self.accounts[2], external_address, 1000000)
# r = self.rpc.do(o)
#
# nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.transfer(self.address, self.accounts[1], external_address, 999999)
# r = self.rpc.do(o)
#
# self.backend.time_travel(self.start_time + self.period_seconds + 1)
#
# o = c.redistributions(self.address, 0, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# self.assertEqual(strip_0x(r), '000000000000000000000000f42400000000010000000000001e848000000001')
#
# o = c.redistributions(self.address, 0, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# self.assertEqual(strip_0x(r), '000000000000000000000000f42400000000010000000000001e848000000001')
#
#
# nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000)
# r = self.rpc.do(o)
#
# o = c.redistributions(self.address, 1, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# self.assertEqual(strip_0x(r), '000000000000000000000000ef4200000000000000000000002dc6c000000002')
#
#
# def test_redistribution_balance_on_zero_participants(self):
# supply = self.default_supply
#
# nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], supply)
# r = self.rpc.do(o)
#
# self.backend.time_travel(self.start_time + self.period_seconds + 1)
# (tx_hash, o) = c.apply_demurrage(self.address, self.accounts[0])
# self.rpc.do(o)
# o = receipt(tx_hash)
# rcpt = self.rpc.do(o)
# self.assertEqual(rcpt['status'], 1)
#
# (tx_hash, o) = c.change_period(self.address, self.accounts[0])
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
# o = c.total_supply(self.address, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# total_supply = c.parse_total_supply(r)
# sink_increment = int(total_supply * (self.tax_level / 1000000))
# self.assertEqual(supply, total_supply)
#
# for l in rcpt['logs']:
# if l['topics'][0] == '0xa0717e54e02bd9829db5e6e998aec0ae9de796b8d150a3cc46a92ab869697755': # event Decayed(uint256,uint256,uint256,uint256)
# period = int.from_bytes(bytes.fromhex(strip_0x(l['topics'][1])), 'big')
# self.assertEqual(period, 2)
# b = bytes.fromhex(strip_0x(l['data']))
# remainder = int.from_bytes(b, 'big')
# self.assertEqual(remainder, int((1000000 - self.tax_level) * (10 ** 32)))
#
# o = c.balance_of(self.address, self.sink_address, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# sink_balance = c.parse_balance_of(r)
#
# self.assertEqual(sink_balance, int(sink_increment * 0.98))
# self.assertEqual(sink_balance, int(sink_increment * (1000000 - self.tax_level) / 1000000))
#
# o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
# r = self.rpc.do(o)
# balance = c.parse_balance_of(r)
# self.assertEqual(balance, supply - sink_increment)
#
#
# def test_redistribution_two_of_ten(self):
# mint_amount = 100000000
# nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# z = 0
# for i in range(10):
# (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[i], mint_amount)
# self.rpc.do(o)
# z += mint_amount
#
# o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
# r = self.rpc.do(o)
# initial_balance = c.parse_balance_of(r)
#
# spend_amount = 1000000
# external_address = to_checksum_address('0x' + os.urandom(20).hex())
#
# nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.transfer(self.address, self.accounts[1], external_address, spend_amount)
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
# nonce_oracle = RPCNonceOracle(self.accounts[2], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.transfer(self.address, self.accounts[2], external_address, spend_amount)
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
# # No cheating!
# nonce_oracle = RPCNonceOracle(self.accounts[3], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.transfer(self.address, self.accounts[3], self.accounts[3], spend_amount)
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
# # No cheapskating!
# nonce_oracle = RPCNonceOracle(self.accounts[4], self.rpc)
# c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
# (tx_hash, o) = c.transfer(self.address, self.accounts[4], external_address, spend_amount-1)
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
#
# self.backend.time_travel(self.start_time + self.period_seconds + 1)
#
# (tx_hash, o) = c.apply_demurrage(self.address, self.accounts[4])
# self.rpc.do(o)
#
# (tx_hash, o) = c.change_period(self.address, self.accounts[4])
# self.rpc.do(o)
#
# o = c.balance_of(self.address, self.accounts[3], sender_address=self.accounts[0])
# r = self.rpc.do(o)
# bummer_balance = c.parse_balance_of(r)
#
# self.assertEqual(bummer_balance, mint_amount - (mint_amount * (self.tax_level / 1000000)))
# logg.debug('bal {} '.format(bummer_balance))
#
# o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
# r = self.rpc.do(o)
# bummer_balance = c.parse_balance_of(r)
# spender_balance = mint_amount - spend_amount
# spender_decayed_balance = int(spender_balance - (spender_balance * (self.tax_level / 1000000)))
# self.assertEqual(bummer_balance, spender_decayed_balance)
# logg.debug('bal {} '.format(bummer_balance))
#
# (tx_hash, o) = c.apply_redistribution_on_account(self.address, self.accounts[4], self.accounts[1])
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
# (tx_hash, o) = c.apply_redistribution_on_account(self.address, self.accounts[4], self.accounts[2])
# self.rpc.do(o)
# o = receipt(tx_hash)
# r = self.rpc.do(o)
# self.assertEqual(r['status'], 1)
#
# o = c.redistributions(self.address, 0, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# redistribution_data = c.parse_redistributions(r)
# logg.debug('redist data {}'.format(redistribution_data))
#
# o = c.account_period(self.address, self.accounts[1], sender_address=self.accounts[0])
# r = self.rpc.do(o)
# account_period_data = c.parse_account_period(r)
# logg.debug('account period {}'.format(account_period_data))
#
# o = c.actual_period(self.address, sender_address=self.accounts[0])
# r = self.rpc.do(o)
# actual_period = c.parse_actual_period(r)
# logg.debug('period {}'.format(actual_period))
#
# redistribution = int((z / 2) * (self.tax_level / 1000000))
# spender_new_base_balance = ((mint_amount - spend_amount) + redistribution)
# spender_new_decayed_balance = int(spender_new_base_balance - (spender_new_base_balance * (self.tax_level / 1000000)))
#
# o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
# r = self.rpc.do(o)
# spender_actual_balance = c.parse_balance_of(r)
# logg.debug('rrr {} {}'.format(redistribution, spender_new_decayed_balance))
#
# self.assertEqual(spender_actual_balance, spender_new_decayed_balance)
#
if __name__ == '__main__':
unittest.main()

633
solidity/DemurrageTokenMultiCap.sol
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@ -1,633 +0,0 @@
pragma solidity > 0.6.11;
// SPDX-License-Identifier: GPL-3.0-or-later
contract DemurrageTokenMultiCap {
// Redistribution bit field, with associated shifts and masks
// (Uses sub-byte boundaries)
bytes32[] public redistributions; // uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
uint8 constant shiftRedistributionPeriod = 0;
uint256 constant maskRedistributionPeriod = 0x00000000000000000000000000000000000000000000000000000000ffffffff; // (1 << 32) - 1
uint8 constant shiftRedistributionValue = 32;
uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
uint8 constant shiftRedistributionParticipants = 104;
uint256 constant maskRedistributionParticipants = 0x00000000000000000000000000000fffffffff00000000000000000000000000; // ((1 << 36) - 1) << 104
uint8 constant shiftRedistributionDemurrage = 140;
uint256 constant maskRedistributionDemurrage = 0x000000000000000000000000fffff00000000000000000000000000000000000; // ((1 << 20) - 1) << 140
uint8 constant shiftRedistributionIsFractional = 255;
uint256 constant maskRedistributionIsFractional = 0x8000000000000000000000000000000000000000000000000000000000000000; // 1 << 255
// Account bit field, with associated shifts and masks
// Mirrors structure of redistributions for consistency
mapping (address => bytes32) account; // uint152(unused) | uint32(period) | uint72(value)
uint8 constant shiftAccountValue = 0;
uint256 constant maskAccountValue = 0x0000000000000000000000000000000000000000000000ffffffffffffffffff; // (1 << 72) - 1
uint8 constant shiftAccountPeriod = 72;
uint256 constant maskAccountPeriod = 0x00000000000000000000000000000000000000ffffffff000000000000000000; // ((1 << 32) - 1) << 72
// Cached demurrage amount, ppm with 38 digit resolution
uint128 public demurrageAmount;
// Cached demurrage period; the period for which demurrageAmount was calculated
//uint128 public demurragePeriod;
// Cached demurrage timestamp; the timestamp for which demurrageAmount was last calculated
uint256 public demurrageTimestamp;
// Implements EIP172
address public owner;
address newOwner;
// Implements ERC20
string public name;
// Implements ERC20
string public symbol;
// Implements ERC20
uint256 public decimals;
// Implements ERC20
uint256 public totalSupply;
// Maximum amount of tokens that can be minted
uint256 public supplyCap;
// Minimum amount of (demurraged) tokens an account must spend to participate in redistribution for a particular period
uint256 public minimumParticipantSpend;
// 128 bit resolution of the demurrage divisor
// (this constant x 1000000 is contained within 128 bits)
uint256 constant ppmDivider = 100000000000000000000000000000000;
// demurrage decimal width; 38 places
uint256 public immutable resolutionFactor = ppmDivider * 1000000;
// Timestamp of start of periods (time which contract constructor was called)
uint256 public immutable periodStart;
// Duration of a single redistribution period in seconds
uint256 public immutable periodDuration;
// Demurrage in ppm per minute
uint256 public immutable taxLevel;
// Addresses allowed to mint new tokens
mapping (address => bool) minter;
// Storage for ERC20 approve/transferFrom methods
mapping (address => mapping (address => uint256 ) ) allowance; // holder -> spender -> amount (amount is subject to demurrage)
// Address to send unallocated redistribution tokens
address sinkAddress;
// Implements ERC20
event Transfer(address indexed _from, address indexed _to, uint256 _value);
// Implements ERC20
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
// New tokens minted
event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
// New demurrage cache milestone calculated
event Decayed(uint256 indexed _period, uint256 indexed _periodCount, uint256 indexed _oldAmount, uint256 _newAmount);
// When a new period threshold has been crossed
event Period(uint256 _period);
// Redistribution applied on a single eligible account
event Redistribution(address indexed _account, uint256 indexed _period, uint256 _value);
// Temporary event used in development, will be removed on prod
event Debug(bytes32 _foo);
// EIP173
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress, uint256 _supplyCap) public {
// ACL setup
owner = msg.sender;
minter[owner] = true;
// ERC20 setup
name = _name;
symbol = _symbol;
decimals = _decimals;
// Demurrage setup
demurrageTimestamp = block.timestamp;
periodStart = demurrageTimestamp;
periodDuration = _periodMinutes * 60;
demurrageAmount = uint128(ppmDivider * 1000000); // Represents 38 decimal places
//demurragePeriod = 1;
taxLevel = _taxLevelMinute; // Represents 38 decimal places
bytes32 initialRedistribution = toRedistribution(0, 1000000, 0, 1);
redistributions.push(initialRedistribution);
// Misc settings
supplyCap = _supplyCap;
sinkAddress = _defaultSinkAddress;
minimumParticipantSpend = 10 ** uint256(_decimals);
}
// Given address will be allowed to call the mintTo() function
function addMinter(address _minter) public returns (bool) {
require(msg.sender == owner);
minter[_minter] = true;
return true;
}
// Given address will no longer be allowed to call the mintTo() function
function removeMinter(address _minter) public returns (bool) {
require(msg.sender == owner || _minter == msg.sender);
minter[_minter] = false;
return true;
}
/// Implements ERC20
function balanceOf(address _account) public view returns (uint256) {
uint256 baseBalance;
uint256 currentDemurragedAmount;
uint256 periodCount;
baseBalance = baseBalanceOf(_account);
//periodCount = actualPeriod() - demurragePeriod;
periodCount = getMinutesDelta(demurrageTimestamp);
currentDemurragedAmount = uint128(decayBy(demurrageAmount, periodCount));
return (baseBalance * currentDemurragedAmount) / (ppmDivider * 1000000);
}
/// Balance unmodified by demurrage
function baseBalanceOf(address _account) public view returns (uint256) {
return uint256(account[_account]) & maskAccountValue;
}
/// Increases base balance for a single account
function increaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
uint256 oldBalance;
uint256 newBalance;
uint256 workAccount;
workAccount = uint256(account[_account]);
if (_delta == 0) {
return false;
}
oldBalance = baseBalanceOf(_account);
newBalance = oldBalance + _delta;
require(uint160(newBalance) > uint160(oldBalance), 'ERR_WOULDWRAP'); // revert if increase would result in a wrapped value
workAccount &= (~maskAccountValue);
workAccount |= (newBalance & maskAccountValue);
account[_account] = bytes32(workAccount);
return true;
}
/// Decreases base balance for a single account
function decreaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
uint256 oldBalance;
uint256 newBalance;
uint256 workAccount;
workAccount = uint256(account[_account]);
if (_delta == 0) {
return false;
}
oldBalance = baseBalanceOf(_account);
require(oldBalance >= _delta, 'ERR_OVERSPEND'); // overspend guard
newBalance = oldBalance - _delta;
workAccount &= (~maskAccountValue);
workAccount |= (newBalance & maskAccountValue);
account[_account] = bytes32(workAccount);
return true;
}
// Creates new tokens out of thin air, and allocates them to the given address
// Triggers tax
function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
uint256 baseAmount;
require(minter[msg.sender]);
require(_amount + totalSupply <= supplyCap);
changePeriod();
baseAmount = toBaseAmount(_amount);
totalSupply += _amount;
increaseBaseBalance(_beneficiary, baseAmount);
emit Mint(msg.sender, _beneficiary, _amount);
saveRedistributionSupply();
return true;
}
// Deserializes the redistribution word
// uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) private pure returns(bytes32) {
bytes32 redistribution;
redistribution |= bytes32((_demurrageModifierPpm << shiftRedistributionDemurrage) & maskRedistributionDemurrage);
redistribution |= bytes32((_participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
redistribution |= bytes32((_value << shiftRedistributionValue) & maskRedistributionValue);
redistribution |= bytes32(_period & maskRedistributionPeriod);
return redistribution;
}
// Serializes the demurrage period part of the redistribution word
function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
return uint256(redistribution) & maskRedistributionPeriod;
}
// Serializes the supply part of the redistribution word
function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionValue) >> shiftRedistributionValue;
}
// Serializes the number of participants part of the redistribution word
function toRedistributionParticipants(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionParticipants) >> shiftRedistributionParticipants;
}
// Serializes the demurrage modifier part of the redistribution word
function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionDemurrage) >> shiftRedistributionDemurrage;
}
// Client accessor to the redistributions array length
function redistributionCount() public view returns (uint256) {
return redistributions.length;
}
// Add number of participants for the current redistribution period by one
function incrementRedistributionParticipants() private returns (bool) {
bytes32 currentRedistribution;
uint256 tmpRedistribution;
uint256 participants;
currentRedistribution = redistributions[redistributions.length-1];
participants = toRedistributionParticipants(currentRedistribution) + 1;
tmpRedistribution = uint256(currentRedistribution);
tmpRedistribution &= (~maskRedistributionParticipants);
tmpRedistribution |= ((participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
redistributions[redistributions.length-1] = bytes32(tmpRedistribution);
return true;
}
// Save the current total supply amount to the current redistribution period
function saveRedistributionSupply() private returns (bool) {
uint256 currentRedistribution;
currentRedistribution = uint256(redistributions[redistributions.length-1]);
currentRedistribution &= (~maskRedistributionValue);
currentRedistribution |= (totalSupply << shiftRedistributionValue);
redistributions[redistributions.length-1] = bytes32(currentRedistribution);
return true;
}
// Get the demurrage period of the current block number
function actualPeriod() public view returns (uint128) {
return uint128((block.timestamp - periodStart) / periodDuration + 1);
}
// Add an entered demurrage period to the redistribution array
function checkPeriod() private view returns (bytes32) {
bytes32 lastRedistribution;
uint256 currentPeriod;
lastRedistribution = redistributions[redistributions.length-1];
currentPeriod = this.actualPeriod();
if (currentPeriod <= toRedistributionPeriod(lastRedistribution)) {
return bytes32(0x00);
}
return lastRedistribution;
}
// Deserialize the pemurrage period for the given account is participating in
function accountPeriod(address _account) public view returns (uint256) {
return (uint256(account[_account]) & maskAccountPeriod) >> shiftAccountPeriod;
}
// Save the given demurrage period as the currently participation period for the given address
function registerAccountPeriod(address _account, uint256 _period) private returns (bool) {
account[_account] &= bytes32(~maskAccountPeriod);
account[_account] |= bytes32((_period << shiftAccountPeriod) & maskAccountPeriod);
incrementRedistributionParticipants();
return true;
}
// Determine whether the unit number is rounded down, rounded up or evenly divides.
// Returns 0 if evenly distributed, or the remainder as a positive number
// A _numParts value 0 will be interpreted as the value 1
function remainder(uint256 _numParts, uint256 _sumWhole) public pure returns (uint256) {
uint256 unit;
uint256 truncatedResult;
if (_numParts == 0) { // no division by zero please
revert('ERR_NUMPARTS_ZERO');
}
require(_numParts < _sumWhole); // At least you are never LESS than the sum of your parts. Think about that.
unit = _sumWhole / _numParts;
truncatedResult = unit * _numParts;
return _sumWhole - truncatedResult;
}
// Called in the edge case where participant number is 0. It will override the participant count to 1.
// Returns the remainder sent to the sink address
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
uint256 redistributionSupply;
uint256 redistributionPeriod;
uint256 unit;
uint256 truncatedResult;
redistributionSupply = toRedistributionSupply(_redistribution);
unit = (redistributionSupply * taxLevel) / 1000000;
truncatedResult = (unit * 1000000) / taxLevel;
if (truncatedResult < redistributionSupply) {
redistributionPeriod = toRedistributionPeriod(_redistribution); // since we reuse period here, can possibly be optimized by passing period instead
redistributions[redistributionPeriod-1] &= bytes32(~maskRedistributionParticipants); // just to be safe, zero out all participant count data, in this case there will be only one
redistributions[redistributionPeriod-1] |= bytes32(maskRedistributionIsFractional | (1 << shiftRedistributionParticipants));
}
increaseBaseBalance(sinkAddress, unit / ppmDivider);
return unit;
}
// sets the remainder bit for the given period and books the remainder to the sink address balance
// returns false if no change was made
function applyRemainderOnPeriod(uint256 _remainder, uint256 _period) private returns (bool) {
uint256 periodSupply;
if (_remainder == 0) {
return false;
}
// TODO: is this needed?
redistributions[_period-1] |= bytes32(maskRedistributionIsFractional);
periodSupply = toRedistributionSupply(redistributions[_period-1]);
increaseBaseBalance(sinkAddress, periodSupply - _remainder);
return true;
}
// Calculate the time delta in whole minutes passed between given timestamp and current timestamp
function getMinutesDelta(uint256 _lastTimestamp) public view returns (uint256) {
return (block.timestamp - _lastTimestamp) / 60;
}
// Calculate and cache the demurrage value corresponding to the (period of the) time of the method call
function applyDemurrage() public returns (bool) {
//uint128 epochPeriodCount;
uint256 periodCount;
uint256 lastDemurrageAmount;
uint256 newDemurrageAmount;
//epochPeriodCount = actualPeriod();
//periodCount = epochPeriodCount - demurragePeriod;
periodCount = getMinutesDelta(demurrageTimestamp);
if (periodCount == 0) {
return false;
}
lastDemurrageAmount = demurrageAmount;
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
//demurragePeriod = epochPeriodCount;
demurrageTimestamp = demurrageTimestamp + (periodCount * 60);
//emit Decayed(epochPeriodCount, periodCount, lastDemurrageAmount, demurrageAmount);
emit Decayed(demurrageTimestamp, periodCount, lastDemurrageAmount, demurrageAmount);
return true;
}
// Return timestamp of start of period threshold
function getPeriodTimeDelta(uint256 _periodCount) public view returns (uint256) {
return periodStart + (_periodCount * periodDuration);
}
// Amount of demurrage cycles inbetween the current timestamp and the given target time
function demurrageCycles(uint256 _target) public view returns (uint256) {
return (block.timestamp - _target) / 60;
}
// Recalculate the demurrage modifier for the new period
// After this, all REPORTED balances will have been reduced by the corresponding ratio (but the effecive totalsupply stays the same)
function changePeriod() public returns (bool) {
bytes32 currentRedistribution;
bytes32 nextRedistribution;
uint256 currentPeriod;
uint256 currentParticipants;
uint256 currentRemainder;
uint256 currentDemurrageAmount;
uint256 nextRedistributionDemurrage;
uint256 demurrageCounts;
uint256 periodTimestamp;
uint256 nextPeriod;
applyDemurrage();
currentRedistribution = checkPeriod();
if (currentRedistribution == bytes32(0x00)) {
return false;
}
currentPeriod = toRedistributionPeriod(currentRedistribution);
nextPeriod = currentPeriod + 1;
periodTimestamp = getPeriodTimeDelta(currentPeriod);
//applyDemurrage();
currentDemurrageAmount = demurrageAmount;
demurrageCounts = demurrageCycles(periodTimestamp);
if (demurrageCounts > 0) {
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts) / ppmDivider;
} else {
nextRedistributionDemurrage = currentDemurrageAmount / ppmDivider;
}
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
redistributions.push(nextRedistribution);
currentParticipants = toRedistributionParticipants(currentRedistribution);
if (currentParticipants == 0) {
currentRemainder = applyDefaultRedistribution(currentRedistribution);
} else {
currentRemainder = remainder(currentParticipants, totalSupply); // we can use totalSupply directly because it will always be the same as the recorded supply on the current redistribution
applyRemainderOnPeriod(currentRemainder, currentPeriod);
}
emit Period(nextPeriod);
return true;
}
// Reverse a value reduced by demurrage by the given period to its original value
function growBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = 1000000;
truncatedTaxLevel = taxLevel / ppmDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / 1000000);
}
return (valueFactor * _value) / 1000000;
}
// Calculate a value reduced by demurrage by the given period
// TODO: higher precision if possible
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = 1000000;
truncatedTaxLevel = taxLevel / ppmDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / 1000000);
}
return (valueFactor * _value) / 1000000;
}
// If the given account is participating in a period and that period has been crossed
// THEN increase the base value of the account with its share of the value reduction of the period
function applyRedistributionOnAccount(address _account) public returns (bool) {
bytes32 periodRedistribution;
uint256 supply;
uint256 participants;
uint256 baseValue;
uint256 value;
uint256 period;
uint256 demurrage;
period = accountPeriod(_account);
if (period == 0 || period >= actualPeriod()) {
return false;
}
periodRedistribution = redistributions[period-1];
participants = toRedistributionParticipants(periodRedistribution);
if (participants == 0) {
return false;
}
supply = toRedistributionSupply(periodRedistribution);
demurrage = toRedistributionDemurrageModifier(periodRedistribution);
baseValue = ((supply / participants) * (taxLevel / 1000000)) / ppmDivider;
value = (baseValue * demurrage) / 1000000;
// zero out period for the account
account[_account] &= bytes32(~maskAccountPeriod);
increaseBaseBalance(_account, value);
emit Redistribution(_account, period, value);
return true;
}
// Inflates the given amount according to the current demurrage modifier
function toBaseAmount(uint256 _value) public view returns (uint256) {
//return (_value * ppmDivider * 1000000) / toDemurrageAmount(demurrageModifier);
return (_value * ppmDivider * 1000000) / demurrageAmount;
}
// Implements ERC20, triggers tax and/or redistribution
function approve(address _spender, uint256 _value) public returns (bool) {
uint256 baseValue;
changePeriod();
applyRedistributionOnAccount(msg.sender);
baseValue = toBaseAmount(_value);
allowance[msg.sender][_spender] += baseValue;
emit Approval(msg.sender, _spender, _value);
return true;
}
// Implements ERC20, triggers tax and/or redistribution
function transfer(address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
bool result;
changePeriod();
applyRedistributionOnAccount(msg.sender);
baseValue = toBaseAmount(_value);
result = transferBase(msg.sender, _to, baseValue);
emit Transfer(msg.sender, _to, _value);
return result;
}
// Implements ERC20, triggers tax and/or redistribution
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
bool result;
changePeriod();
applyRedistributionOnAccount(msg.sender);
baseValue = toBaseAmount(_value);
require(allowance[_from][msg.sender] >= baseValue);
result = transferBase(_from, _to, baseValue);
emit Transfer(_from, _to, _value);
return result;
}
// ERC20 transfer backend for transfer, transferFrom
function transferBase(address _from, address _to, uint256 _value) private returns (bool) {
uint256 period;
decreaseBaseBalance(_from, _value);
increaseBaseBalance(_to, _value);
period = actualPeriod();
if (_value >= minimumParticipantSpend && accountPeriod(_from) != period && _from != _to) {
registerAccountPeriod(_from, period);
}
return true;
}
// Implements EIP173
function transferOwnership(address _newOwner) public returns (bool) {
require(msg.sender == owner);
newOwner = _newOwner;
}
// Implements OwnedAccepter
function acceptOwnership() public returns (bool) {
address oldOwner;
require(msg.sender == newOwner);
oldOwner = owner;
owner = newOwner;
newOwner = address(0);
emit OwnershipTransferred(oldOwner, owner);
}
// Implements EIP165
function supportsInterface(bytes4 _sum) public pure returns (bool) {
if (_sum == 0xc6bb4b70) { // ERC20
return true;
}
if (_sum == 0x449a52f8) { // Minter
return true;
}
if (_sum == 0x01ffc9a7) { // EIP165
return true;
}
if (_sum == 0x9493f8b2) { // EIP173
return true;
}
if (_sum == 0x37a47be4) { // OwnedAccepter
return true;
}
return false;
}
}

614
solidity/DemurrageTokenMultiNocap.sol
View File

@ -1,614 +0,0 @@
pragma solidity > 0.6.11;
// SPDX-License-Identifier: GPL-3.0-or-later
contract DemurrageTokenMultiNocap {
// Redistribution bit field, with associated shifts and masks
// (Uses sub-byte boundaries)
bytes32[] public redistributions; // uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
uint8 constant shiftRedistributionPeriod = 0;
uint256 constant maskRedistributionPeriod = 0x00000000000000000000000000000000000000000000000000000000ffffffff; // (1 << 32) - 1
uint8 constant shiftRedistributionValue = 32;
uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
uint8 constant shiftRedistributionParticipants = 104;
uint256 constant maskRedistributionParticipants = 0x00000000000000000000000000000fffffffff00000000000000000000000000; // ((1 << 36) - 1) << 104
uint8 constant shiftRedistributionDemurrage = 140;
uint256 constant maskRedistributionDemurrage = 0x000000000000000000000000fffff00000000000000000000000000000000000; // ((1 << 20) - 1) << 140
uint8 constant shiftRedistributionIsFractional = 255;
uint256 constant maskRedistributionIsFractional = 0x8000000000000000000000000000000000000000000000000000000000000000; // 1 << 255
// Account bit field, with associated shifts and masks
// Mirrors structure of redistributions for consistency
mapping (address => bytes32) account; // uint152(unused) | uint32(period) | uint72(value)
uint8 constant shiftAccountValue = 0;
uint256 constant maskAccountValue = 0x0000000000000000000000000000000000000000000000ffffffffffffffffff; // (1 << 72) - 1
uint8 constant shiftAccountPeriod = 72;
uint256 constant maskAccountPeriod = 0x00000000000000000000000000000000000000ffffffff000000000000000000; // ((1 << 32) - 1) << 72
// Cached demurrage amount, ppm with 38 digit resolution
uint128 public demurrageAmount;
// Cached demurrage period; the period for which demurrageAmount was calculated
uint128 public demurragePeriod;
// Implements EIP172
address public owner;
address newOwner;
// Implements ERC20
string public name;
// Implements ERC20
string public symbol;
// Implements ERC20
uint256 public decimals;
// Implements ERC20
uint256 public totalSupply;
// Minimum amount of (demurraged) tokens an account must spend to participate in redistribution for a particular period
uint256 public minimumParticipantSpend;
// 128 bit resolution of the demurrage divisor
// (this constant x 1000000 is contained within 128 bits)
uint256 constant ppmDivider = 100000000000000000000000000000000;
// demurrage decimal width; 38 places
uint256 public immutable resolutionFactor = ppmDivider * 1000000;
// Timestamp of start of periods (time which contract constructor was called)
uint256 public immutable periodStart;
// Duration of a single redistribution period in seconds
uint256 public immutable periodDuration;
// Demurrage in ppm per minute
uint256 public immutable taxLevel;
// Addresses allowed to mint new tokens
mapping (address => bool) minter;
// Storage for ERC20 approve/transferFrom methods
mapping (address => mapping (address => uint256 ) ) allowance; // holder -> spender -> amount (amount is subject to demurrage)
// Address to send unallocated redistribution tokens
address sinkAddress;
// Implements ERC20
event Transfer(address indexed _from, address indexed _to, uint256 _value);
// Implements ERC20
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
// New tokens minted
event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
// New demurrage cache milestone calculated
event Decayed(uint256 indexed _period, uint256 indexed _periodCount, uint256 indexed _oldAmount, uint256 _newAmount);
// When a new period threshold has been crossed
event Period(uint256 _period);
// Redistribution applied on a single eligible account
event Redistribution(address indexed _account, uint256 indexed _period, uint256 _value);
// Temporary event used in development, will be removed on prod
event Debug(bytes32 _foo);
// EIP173
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress) public {
// ACL setup
owner = msg.sender;
minter[owner] = true;
// ERC20 setup
name = _name;
symbol = _symbol;
decimals = _decimals;
// Demurrage setup
periodStart = block.timestamp;
periodDuration = _periodMinutes * 60;
demurrageAmount = uint128(ppmDivider * 1000000); // Represents 38 decimal places
demurragePeriod = 1;
taxLevel = _taxLevelMinute; // Represents 38 decimal places
bytes32 initialRedistribution = toRedistribution(0, 1000000, 0, 1);
redistributions.push(initialRedistribution);
// Misc settings
sinkAddress = _defaultSinkAddress;
minimumParticipantSpend = 10 ** uint256(_decimals);
}
// Given address will be allowed to call the mintTo() function
function addMinter(address _minter) public returns (bool) {
require(msg.sender == owner);
minter[_minter] = true;
return true;
}
// Given address will no longer be allowed to call the mintTo() function
function removeMinter(address _minter) public returns (bool) {
require(msg.sender == owner || _minter == msg.sender);
minter[_minter] = false;
return true;
}
/// Implements ERC20
function balanceOf(address _account) public view returns (uint256) {
uint256 baseBalance;
uint256 currentDemurragedAmount;
uint256 periodCount;
baseBalance = baseBalanceOf(_account);
periodCount = actualPeriod() - demurragePeriod;
currentDemurragedAmount = uint128(decayBy(demurrageAmount, periodCount));
return (baseBalance * currentDemurragedAmount) / (ppmDivider * 1000000);
}
/// Balance unmodified by demurrage
function baseBalanceOf(address _account) public view returns (uint256) {
return uint256(account[_account]) & maskAccountValue;
}
/// Increases base balance for a single account
function increaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
uint256 oldBalance;
uint256 newBalance;
uint256 workAccount;
workAccount = uint256(account[_account]);
if (_delta == 0) {
return false;
}
oldBalance = baseBalanceOf(_account);
newBalance = oldBalance + _delta;
require(uint160(newBalance) > uint160(oldBalance), 'ERR_WOULDWRAP'); // revert if increase would result in a wrapped value
workAccount &= (~maskAccountValue);
workAccount |= (newBalance & maskAccountValue);
account[_account] = bytes32(workAccount);
return true;
}
/// Decreases base balance for a single account
function decreaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
uint256 oldBalance;
uint256 newBalance;
uint256 workAccount;
workAccount = uint256(account[_account]);
if (_delta == 0) {
return false;
}
oldBalance = baseBalanceOf(_account);
require(oldBalance >= _delta, 'ERR_OVERSPEND'); // overspend guard
newBalance = oldBalance - _delta;
workAccount &= (~maskAccountValue);
workAccount |= (newBalance & maskAccountValue);
account[_account] = bytes32(workAccount);
return true;
}
// Creates new tokens out of thin air, and allocates them to the given address
// Triggers tax
function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
uint256 baseAmount;
require(minter[msg.sender]);
changePeriod();
baseAmount = _amount;
totalSupply += _amount;
increaseBaseBalance(_beneficiary, baseAmount);
emit Mint(msg.sender, _beneficiary, _amount);
saveRedistributionSupply();
return true;
}
// Deserializes the redistribution word
// uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) private pure returns(bytes32) {
bytes32 redistribution;
redistribution |= bytes32((_demurrageModifierPpm << shiftRedistributionDemurrage) & maskRedistributionDemurrage);
redistribution |= bytes32((_participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
redistribution |= bytes32((_value << shiftRedistributionValue) & maskRedistributionValue);
redistribution |= bytes32(_period & maskRedistributionPeriod);
return redistribution;
}
// Serializes the demurrage period part of the redistribution word
function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
return uint256(redistribution) & maskRedistributionPeriod;
}
// Serializes the supply part of the redistribution word
function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionValue) >> shiftRedistributionValue;
}
// Serializes the number of participants part of the redistribution word
function toRedistributionParticipants(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionParticipants) >> shiftRedistributionParticipants;
}
// Serializes the number of participants part of the redistribution word
function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionDemurrage) >> shiftRedistributionDemurrage;
}
// Client accessor to the redistributions array length
function redistributionCount() public view returns (uint256) {
return redistributions.length;
}
// Add number of participants for the current redistribution period by one
function incrementRedistributionParticipants() private returns (bool) {
bytes32 currentRedistribution;
uint256 tmpRedistribution;
uint256 participants;
currentRedistribution = redistributions[redistributions.length-1];
participants = toRedistributionParticipants(currentRedistribution) + 1;
tmpRedistribution = uint256(currentRedistribution);
tmpRedistribution &= (~maskRedistributionParticipants);
tmpRedistribution |= ((participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
redistributions[redistributions.length-1] = bytes32(tmpRedistribution);
return true;
}
// Save the current total supply amount to the current redistribution period
function saveRedistributionSupply() private returns (bool) {
uint256 currentRedistribution;
currentRedistribution = uint256(redistributions[redistributions.length-1]);
currentRedistribution &= (~maskRedistributionValue);
currentRedistribution |= (totalSupply << shiftRedistributionValue);
redistributions[redistributions.length-1] = bytes32(currentRedistribution);
return true;
}
// Get the demurrage period of the current block number
function actualPeriod() public view returns (uint128) {
return uint128((block.timestamp - periodStart) / periodDuration + 1);
}
// Add an entered demurrage period to the redistribution array
function checkPeriod() private view returns (bytes32) {
bytes32 lastRedistribution;
uint256 currentPeriod;
lastRedistribution = redistributions[redistributions.length-1];
currentPeriod = this.actualPeriod();
if (currentPeriod <= toRedistributionPeriod(lastRedistribution)) {
return bytes32(0x00);
}
return lastRedistribution;
}
// Deserialize the pemurrage period for the given account is participating in
function accountPeriod(address _account) public view returns (uint256) {
return (uint256(account[_account]) & maskAccountPeriod) >> shiftAccountPeriod;
}
// Save the given demurrage period as the currently participation period for the given address
function registerAccountPeriod(address _account, uint256 _period) private returns (bool) {
account[_account] &= bytes32(~maskAccountPeriod);
account[_account] |= bytes32((_period << shiftAccountPeriod) & maskAccountPeriod);
incrementRedistributionParticipants();
return true;
}
// Determine whether the unit number is rounded down, rounded up or evenly divides.
// Returns 0 if evenly distributed, or the remainder as a positive number
// A _numParts value 0 will be interpreted as the value 1
function remainder(uint256 _numParts, uint256 _sumWhole) public pure returns (uint256) {
uint256 unit;
uint256 truncatedResult;
if (_numParts == 0) { // no division by zero please
revert('ERR_NUMPARTS_ZERO');
}
require(_numParts < _sumWhole); // At least you are never LESS than the sum of your parts. Think about that.
unit = _sumWhole / _numParts;
truncatedResult = unit * _numParts;
return _sumWhole - truncatedResult;
}
// Called in the edge case where participant number is 0. It will override the participant count to 1.
// Returns the remainder sent to the sink address
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
uint256 redistributionSupply;
uint256 redistributionPeriod;
uint256 unit;
uint256 truncatedResult;
redistributionSupply = toRedistributionSupply(_redistribution);
unit = (redistributionSupply * taxLevel) / 1000000;
truncatedResult = (unit * 1000000) / taxLevel;
if (truncatedResult < redistributionSupply) {
redistributionPeriod = toRedistributionPeriod(_redistribution); // since we reuse period here, can possibly be optimized by passing period instead
redistributions[redistributionPeriod-1] &= bytes32(~maskRedistributionParticipants); // just to be safe, zero out all participant count data, in this case there will be only one
redistributions[redistributionPeriod-1] |= bytes32(maskRedistributionIsFractional | (1 << shiftRedistributionParticipants));
}
increaseBaseBalance(sinkAddress, unit / ppmDivider);
return unit;
}
// sets the remainder bit for the given period and books the remainder to the sink address balance
// returns false if no change was made
function applyRemainderOnPeriod(uint256 _remainder, uint256 _period) private returns (bool) {
uint256 periodSupply;
if (_remainder == 0) {
return false;
}
// TODO: is this needed?
redistributions[_period-1] |= bytes32(maskRedistributionIsFractional);
periodSupply = toRedistributionSupply(redistributions[_period-1]);
increaseBaseBalance(sinkAddress, periodSupply - _remainder);
return true;
}
// Calculate and cache the demurrage value corresponding to the (period of the) time of the method call
function applyDemurrage() public returns (bool) {
uint128 epochPeriodCount;
uint128 periodCount;
uint256 lastDemurrageAmount;
uint256 newDemurrageAmount;
epochPeriodCount = actualPeriod();
periodCount = epochPeriodCount - demurragePeriod;
if (periodCount == 0) {
return false;
}
lastDemurrageAmount = demurrageAmount;
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
demurragePeriod = epochPeriodCount;
emit Decayed(epochPeriodCount, periodCount, lastDemurrageAmount, demurrageAmount);
return true;
}
// Return timestamp of start of period threshold
function getPeriodTimeDelta(uint256 _periodCount) public view returns (uint256) {
return periodStart + (_periodCount * periodDuration);
}
// Amount of demurrage cycles inbetween the current timestamp and the given target time
function demurrageCycles(uint256 _target) public view returns (uint256) {
return (block.timestamp - _target) / 60;
}
// Recalculate the demurrage modifier for the new period
// After this, all REPORTED balances will have been reduced by the corresponding ratio (but the effecive totalsupply stays the same)
function changePeriod() public returns (bool) {
bytes32 currentRedistribution;
bytes32 nextRedistribution;
uint256 currentPeriod;
uint256 currentParticipants;
uint256 currentRemainder;
uint256 currentDemurrageAmount;
uint256 nextRedistributionDemurrage;
uint256 demurrageCounts;
uint256 periodTimestamp;
uint256 nextPeriod;
currentRedistribution = checkPeriod();
if (currentRedistribution == bytes32(0x00)) {
return false;
}
currentPeriod = toRedistributionPeriod(currentRedistribution);
nextPeriod = currentPeriod + 1;
periodTimestamp = getPeriodTimeDelta(currentPeriod);
applyDemurrage();
currentDemurrageAmount = demurrageAmount;
demurrageCounts = demurrageCycles(periodTimestamp);
if (demurrageCounts > 0) {
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts) / ppmDivider;
} else {
nextRedistributionDemurrage = currentDemurrageAmount / ppmDivider;
}
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
redistributions.push(nextRedistribution);
currentParticipants = toRedistributionParticipants(currentRedistribution);
if (currentParticipants == 0) {
currentRemainder = applyDefaultRedistribution(currentRedistribution);
} else {
currentRemainder = remainder(currentParticipants, totalSupply); // we can use totalSupply directly because it will always be the same as the recorded supply on the current redistribution
applyRemainderOnPeriod(currentRemainder, currentPeriod);
}
emit Period(nextPeriod);
return true;
}
// Reverse a value reduced by demurrage by the given period to its original value
function growBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = 1000000;
truncatedTaxLevel = taxLevel / ppmDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / 1000000);
}
return (valueFactor * _value) / 1000000;
}
// Calculate a value reduced by demurrage by the given period
// TODO: higher precision if possible
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = 1000000;
truncatedTaxLevel = taxLevel / ppmDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / 1000000);
}
return (valueFactor * _value) / 1000000;
}
// If the given account is participating in a period and that period has been crossed
// THEN increase the base value of the account with its share of the value reduction of the period
function applyRedistributionOnAccount(address _account) public returns (bool) {
bytes32 periodRedistribution;
uint256 supply;
uint256 participants;
uint256 baseValue;
uint256 value;
uint256 period;
uint256 demurrage;
period = accountPeriod(_account);
if (period == 0 || period >= actualPeriod()) {
return false;
}
periodRedistribution = redistributions[period-1];
participants = toRedistributionParticipants(periodRedistribution);
if (participants == 0) {
return false;
}
supply = toRedistributionSupply(periodRedistribution);
demurrage = toRedistributionDemurrageModifier(periodRedistribution);
baseValue = ((supply / participants) * (taxLevel / 1000000)) / ppmDivider;
value = (baseValue * demurrage) / 1000000;
// zero out period for the account
account[_account] &= bytes32(~maskAccountPeriod);
increaseBaseBalance(_account, value);
emit Redistribution(_account, period, value);
return true;
}
// Inflates the given amount according to the current demurrage modifier
function toBaseAmount(uint256 _value) public view returns (uint256) {
//return (_value * ppmDivider * 1000000) / toDemurrageAmount(demurrageModifier);
return (_value * ppmDivider * 1000000) / demurrageAmount;
}
// Implements ERC20, triggers tax and/or redistribution
function approve(address _spender, uint256 _value) public returns (bool) {
uint256 baseValue;
changePeriod();
applyRedistributionOnAccount(msg.sender);
baseValue = toBaseAmount(_value);
allowance[msg.sender][_spender] += baseValue;
emit Approval(msg.sender, _spender, _value);
return true;
}
// Implements ERC20, triggers tax and/or redistribution
function transfer(address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
bool result;
changePeriod();
applyRedistributionOnAccount(msg.sender);
baseValue = toBaseAmount(_value);
result = transferBase(msg.sender, _to, baseValue);
emit Transfer(msg.sender, _to, _value);
return result;
}
// Implements ERC20, triggers tax and/or redistribution
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
bool result;
changePeriod();
applyRedistributionOnAccount(msg.sender);
baseValue = toBaseAmount(_value);
require(allowance[_from][msg.sender] >= baseValue);
result = transferBase(_from, _to, baseValue);
emit Transfer(_from, _to, _value);
return result;
}
// ERC20 transfer backend for transfer, transferFrom
function transferBase(address _from, address _to, uint256 _value) private returns (bool) {
uint256 period;
decreaseBaseBalance(_from, _value);
increaseBaseBalance(_to, _value);
period = actualPeriod();
if (_value >= minimumParticipantSpend && accountPeriod(_from) != period && _from != _to) {
registerAccountPeriod(_from, period);
}
return true;
}
// Implements EIP173
function transferOwnership(address _newOwner) public returns (bool) {
require(msg.sender == owner);
newOwner = _newOwner;
}
// Implements OwnedAccepter
function acceptOwnership() public returns (bool) {
address oldOwner;
require(msg.sender == newOwner);
oldOwner = owner;
owner = newOwner;
newOwner = address(0);
emit OwnershipTransferred(oldOwner, owner);
}
// Implements EIP165
function supportsInterface(bytes4 _sum) public pure returns (bool) {
if (_sum == 0xc6bb4b70) { // ERC20
return true;
}
if (_sum == 0x449a52f8) { // Minter
return true;
}
if (_sum == 0x01ffc9a7) { // EIP165
return true;
}
if (_sum == 0x9493f8b2) { // EIP173
return true;
}
if (_sum == 0x37a47be4) { // OwnedAccepter
return true;
}
return false;
}
}

517
solidity/DemurrageTokenSingleCap.sol
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@ -1,517 +0,0 @@
pragma solidity > 0.6.11;
// SPDX-License-Identifier: GPL-3.0-or-later
contract DemurrageTokenSingleCap {
// Redistribution bit field, with associated shifts and masks
// (Uses sub-byte boundaries)
bytes32[] public redistributions; // uint51(unused) | uint64(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
uint8 constant shiftRedistributionPeriod = 0;
uint256 constant maskRedistributionPeriod = 0x00000000000000000000000000000000000000000000000000000000ffffffff; // (1 << 32) - 1
uint8 constant shiftRedistributionValue = 32;
uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
uint8 constant shiftRedistributionDemurrage = 104;
uint256 constant maskRedistributionDemurrage = 0x0000000000ffffffffffffffffffffffffffff00000000000000000000000000; // ((1 << 20) - 1) << 140
// Account balances
mapping (address => uint256) account;
// Cached demurrage amount, ppm with 38 digit resolution
uint128 public demurrageAmount;
// Cached demurrage period; the period for which demurrageAmount was calculated
//uint128 public demurragePeriod;
// Cached demurrage timestamp; the timestamp for which demurrageAmount was last calculated
uint256 public demurrageTimestamp;
// Implements EIP172
address public owner;
address newOwner;
// Implements ERC20
string public name;
// Implements ERC20
string public symbol;
// Implements ERC20
uint256 public decimals;
// Implements ERC20
uint256 public totalSupply;
// Maximum amount of tokens that can be minted
uint256 public supplyCap;
// Minimum amount of (demurraged) tokens an account must spend to participate in redistribution for a particular period
uint256 public minimumParticipantSpend;
// 128 bit resolution of the demurrage divisor
// (this constant x 1000000 is contained within 128 bits)
uint256 constant nanoDivider = 100000000000000000000000000; // now nanodivider, 6 zeros less
// remaining decimal positions of nanoDivider to reach 38, equals precision in growth and decay
uint256 constant growthResolutionFactor = 1000000000000;
// demurrage decimal width; 38 places
uint256 public immutable resolutionFactor = nanoDivider * growthResolutionFactor;
// Timestamp of start of periods (time which contract constructor was called)
uint256 public immutable periodStart;
// Duration of a single redistribution period in seconds
uint256 public immutable periodDuration;
// Demurrage in ppm per minute
uint256 public immutable taxLevel;
// Addresses allowed to mint new tokens
mapping (address => bool) minter;
// Storage for ERC20 approve/transferFrom methods
mapping (address => mapping (address => uint256 ) ) allowance; // holder -> spender -> amount (amount is subject to demurrage)
// Address to send unallocated redistribution tokens
address sinkAddress;
// Implements ERC20
event Transfer(address indexed _from, address indexed _to, uint256 _value);
// Implements ERC20
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
// New tokens minted
event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
// New demurrage cache milestone calculated
event Decayed(uint256 indexed _period, uint256 indexed _periodCount, uint256 indexed _oldAmount, uint256 _newAmount);
// When a new period threshold has been crossed
event Period(uint256 _period);
// Redistribution applied on a single eligible account
event Redistribution(address indexed _account, uint256 indexed _period, uint256 _value);
// Temporary event used in development, will be removed on prod
event Debug(bytes32 _foo);
// EIP173
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint128 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress, uint256 _supplyCap) public {
// ACL setup
owner = msg.sender;
minter[owner] = true;
// ERC20 setup
name = _name;
symbol = _symbol;
decimals = _decimals;
// Demurrage setup
demurrageTimestamp = block.timestamp;
periodStart = demurrageTimestamp;
periodDuration = _periodMinutes * 60;
//demurrageAmount = 100000000000000000000000000000000000000 - _taxLevelMinute; // Represents 38 decimal places, same as resolutionFactor
//demurrageAmount = 100000000000000000000000000000000000000;
demurrageAmount = 10000000000000000000000000000;
//demurragePeriod = 1;
taxLevel = _taxLevelMinute; // Represents 38 decimal places
bytes32 initialRedistribution = toRedistribution(0, demurrageAmount, 0, 1);
redistributions.push(initialRedistribution);
// Misc settings
supplyCap = _supplyCap;
sinkAddress = _defaultSinkAddress;
minimumParticipantSpend = 10 ** uint256(_decimals);
}
// Change sink address for redistribution
function setSinkAddress(address _sinkAddress) public {
require(msg.sender == owner);
sinkAddress = _sinkAddress;
}
// Given address will be allowed to call the mintTo() function
function addMinter(address _minter) public returns (bool) {
require(msg.sender == owner);
minter[_minter] = true;
return true;
}
// Given address will no longer be allowed to call the mintTo() function
function removeMinter(address _minter) public returns (bool) {
require(msg.sender == owner || _minter == msg.sender);
minter[_minter] = false;
return true;
}
/// Implements ERC20
function balanceOf(address _account) public view returns (uint256) {
uint256 baseBalance;
uint256 currentDemurragedAmount;
uint256 periodCount;
baseBalance = baseBalanceOf(_account);
//periodCount = actualPeriod() - demurragePeriod;
periodCount = getMinutesDelta(demurrageTimestamp);
currentDemurragedAmount = uint128(decayBy(demurrageAmount * 10000000000, periodCount));
return (baseBalance * currentDemurragedAmount) / (nanoDivider * 1000000000000);
}
/// Balance unmodified by demurrage
function baseBalanceOf(address _account) public view returns (uint256) {
return account[_account];
}
/// Increases base balance for a single account
function increaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
uint256 oldBalance;
uint256 newBalance;
uint256 workAccount;
workAccount = uint256(account[_account]);
if (_delta == 0) {
return false;
}
oldBalance = baseBalanceOf(_account);
account[_account] = oldBalance + _delta;
return true;
}
/// Decreases base balance for a single account
function decreaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
uint256 oldBalance;
uint256 newBalance;
uint256 workAccount;
workAccount = uint256(account[_account]);
if (_delta == 0) {
return false;
}
oldBalance = baseBalanceOf(_account);
require(oldBalance >= _delta, 'ERR_OVERSPEND'); // overspend guard
account[_account] = oldBalance - _delta;
return true;
}
// Creates new tokens out of thin air, and allocates them to the given address
// Triggers tax
function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
uint256 baseAmount;
require(minter[msg.sender], 'ERR_ACCESS');
require(_amount + totalSupply <= supplyCap, 'ERR_CAP');
changePeriod();
baseAmount = toBaseAmount(_amount);
totalSupply += _amount;
increaseBaseBalance(_beneficiary, baseAmount);
emit Mint(msg.sender, _beneficiary, _amount);
saveRedistributionSupply();
return true;
}
// Deserializes the redistribution word
// uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) public pure returns(bytes32) {
bytes32 redistribution;
redistribution |= bytes32((_demurrageModifierPpm << shiftRedistributionDemurrage) & maskRedistributionDemurrage);
redistribution |= bytes32((_value << shiftRedistributionValue) & maskRedistributionValue);
redistribution |= bytes32(_period & maskRedistributionPeriod);
return redistribution;
}
// Serializes the demurrage period part of the redistribution word
function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
return uint256(redistribution) & maskRedistributionPeriod;
}
// Serializes the supply part of the redistribution word
function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionValue) >> shiftRedistributionValue;
}
// Serializes the number of participants part of the redistribution word
function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) {
return (uint256(redistribution) & maskRedistributionDemurrage) >> shiftRedistributionDemurrage;
}
// Client accessor to the redistributions array length
function redistributionCount() public view returns (uint256) {
return redistributions.length;
}
// Save the current total supply amount to the current redistribution period
function saveRedistributionSupply() private returns (bool) {
uint256 currentRedistribution;
uint256 grownSupply;
//grownSupply = growBy(totalSupply, 1);
grownSupply = totalSupply;
currentRedistribution = uint256(redistributions[redistributions.length-1]);
currentRedistribution &= (~maskRedistributionValue);
currentRedistribution |= (grownSupply << shiftRedistributionValue);
redistributions[redistributions.length-1] = bytes32(currentRedistribution);
return true;
}
// Get the demurrage period of the current block number
function actualPeriod() public view returns (uint128) {
return uint128((block.timestamp - periodStart) / periodDuration + 1);
}
// Add an entered demurrage period to the redistribution array
function checkPeriod() private view returns (bytes32) {
bytes32 lastRedistribution;
uint256 currentPeriod;
lastRedistribution = redistributions[redistributions.length-1];
currentPeriod = this.actualPeriod();
if (currentPeriod <= toRedistributionPeriod(lastRedistribution)) {
return bytes32(0x00);
}
return lastRedistribution;
}
function getDistribution(uint256 _supply, uint256 _demurrageAmount) public view returns (uint256) {
uint256 difference;
difference = _supply * (resolutionFactor - (_demurrageAmount * 10000000000)); //(nanoDivider - ((resolutionFactor - _demurrageAmount) / nanoDivider));
return difference / resolutionFactor;
}
function getDistributionFromRedistribution(bytes32 _redistribution) public returns (uint256) {
uint256 redistributionSupply;
uint256 redistributionDemurrage;
redistributionSupply = toRedistributionSupply(_redistribution);
redistributionDemurrage = toRedistributionDemurrageModifier(_redistribution);
return getDistribution(redistributionSupply, redistributionDemurrage);
}
// Returns the amount sent to the sink address
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
uint256 unit;
unit = getDistributionFromRedistribution(_redistribution);
increaseBaseBalance(sinkAddress, toBaseAmount(unit));
return unit;
}
// Calculate the time delta in whole minutes passed between given timestamp and current timestamp
function getMinutesDelta(uint256 _lastTimestamp) public view returns (uint256) {
return (block.timestamp - _lastTimestamp) / 60;
}
// Calculate and cache the demurrage value corresponding to the (period of the) time of the method call
function applyDemurrage() public returns (bool) {
return applyDemurrageLimited(0);
}
function applyDemurrageLimited(uint256 _rounds) public returns (bool) {
//uint128 epochPeriodCount;
uint256 periodCount;
uint256 lastDemurrageAmount;
//epochPeriodCount = actualPeriod();
//periodCount = epochPeriodCount - demurragePeriod;
periodCount = getMinutesDelta(demurrageTimestamp);
if (periodCount == 0) {
return false;
}
lastDemurrageAmount = demurrageAmount;
// safety limit for exponential calculation to ensure that we can always
// execute this code no matter how much time passes.
if (_rounds > 0 && _rounds < periodCount) {
periodCount = _rounds;
}
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
//demurragePeriod = epochPeriodCount;
demurrageTimestamp = demurrageTimestamp + (periodCount * 60);
emit Decayed(demurrageTimestamp, periodCount, lastDemurrageAmount, demurrageAmount);
return true;
}
// Return timestamp of start of period threshold
function getPeriodTimeDelta(uint256 _periodCount) public view returns (uint256) {
return periodStart + (_periodCount * periodDuration);
}
// Amount of demurrage cycles inbetween the current timestamp and the given target time
function demurrageCycles(uint256 _target) public view returns (uint256) {
return (block.timestamp - _target) / 60;
}
// Recalculate the demurrage modifier for the new period
function changePeriod() public returns (bool) {
bytes32 currentRedistribution;
bytes32 nextRedistribution;
uint256 currentPeriod;
uint256 currentDemurrageAmount;
uint256 nextRedistributionDemurrage;
uint256 demurrageCounts;
uint256 periodTimestamp;
uint256 nextPeriod;
applyDemurrage();
currentRedistribution = checkPeriod();
if (currentRedistribution == bytes32(0x00)) {
return false;
}
currentPeriod = toRedistributionPeriod(currentRedistribution);
nextPeriod = currentPeriod + 1;
periodTimestamp = getPeriodTimeDelta(currentPeriod);
currentDemurrageAmount = demurrageAmount;
demurrageCounts = demurrageCycles(periodTimestamp);
if (demurrageCounts > 0) {
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts);
} else {
nextRedistributionDemurrage = currentDemurrageAmount;
}
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
redistributions.push(nextRedistribution);
applyDefaultRedistribution(nextRedistribution);
emit Period(nextPeriod);
return true;
}
// Reverse a value reduced by demurrage by the given period to its original value
function growBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = growthResolutionFactor;
truncatedTaxLevel = taxLevel / nanoDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / growthResolutionFactor);
}
return (valueFactor * _value) / growthResolutionFactor;
}
// Calculate a value reduced by demurrage by the given period
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
uint256 valueFactor;
uint256 truncatedTaxLevel;
valueFactor = growthResolutionFactor;
truncatedTaxLevel = taxLevel / nanoDivider;
for (uint256 i = 0; i < _period; i++) {
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / growthResolutionFactor);
}
return (valueFactor * _value) / growthResolutionFactor;
}
// Inflates the given amount according to the current demurrage modifier
function toBaseAmount(uint256 _value) public view returns (uint256) {
return (_value * resolutionFactor) / (demurrageAmount * 10000000000);
}
// Implements ERC20, triggers tax and/or redistribution
function approve(address _spender, uint256 _value) public returns (bool) {
uint256 baseValue;
changePeriod();
baseValue = toBaseAmount(_value);
allowance[msg.sender][_spender] += baseValue;
emit Approval(msg.sender, _spender, _value);
return true;
}
// Implements ERC20, triggers tax and/or redistribution
function transfer(address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
bool result;
changePeriod();
baseValue = toBaseAmount(_value);
result = transferBase(msg.sender, _to, baseValue);
emit Transfer(msg.sender, _to, _value);
return result;
}
// Implements ERC20, triggers tax and/or redistribution
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
uint256 baseValue;
bool result;
changePeriod();
baseValue = toBaseAmount(_value);
require(allowance[_from][msg.sender] >= baseValue);
result = transferBase(_from, _to, baseValue);
emit Transfer(_from, _to, _value);
return result;
}
// ERC20 transfer backend for transfer, transferFrom
function transferBase(address _from, address _to, uint256 _value) private returns (bool) {
uint256 period;
decreaseBaseBalance(_from, _value);
increaseBaseBalance(_to, _value);
//period = actualPeriod();
return true;
}
// Implements EIP173
function transferOwnership(address _newOwner) public returns (bool) {
require(msg.sender == owner);
newOwner = _newOwner;
}
// Implements OwnedAccepter
function acceptOwnership() public returns (bool) {
address oldOwner;
require(msg.sender == newOwner);
oldOwner = owner;
owner = newOwner;
newOwner = address(0);
emit OwnershipTransferred(oldOwner, owner);
}
// Implements EIP165
function supportsInterface(bytes4 _sum) public pure returns (bool) {
if (_sum == 0xc6bb4b70) { // ERC20
return true;
}
if (_sum == 0x449a52f8) { // Minter
return true;
}
if (_sum == 0x01ffc9a7) { // EIP165
return true;
}
if (_sum == 0x9493f8b2) { // EIP173
return true;
}
if (_sum == 0x37a47be4) { // OwnedAccepter
return true;
}
return false;
}
}

3
solidity/DemurrageTokenSingleNocap.sol
View File

@ -189,12 +189,11 @@ contract DemurrageTokenSingleCap {
function setMaxSupply(uint256 _cap) public { function setMaxSupply(uint256 _cap) public {
require(!isSealed(CAP_STATE)); require(!isSealed(CAP_STATE));
require(msg.sender == owner); require(msg.sender == owner);
require(_cap > supply); require(_cap > totalSupply());
emit Cap(maxSupply, _cap); emit Cap(maxSupply, _cap);
maxSupply = _cap; maxSupply = _cap;
} }
// Change sink address for redistribution // Change sink address for redistribution
function setSinkAddress(address _sinkAddress) public { function setSinkAddress(address _sinkAddress) public {
require(!isSealed(SINK_STATE)); require(!isSealed(SINK_STATE));

19
solidity/Makefile
View File

@ -2,29 +2,12 @@ SOLC = /usr/bin/solc
all: single_nocap all: single_nocap
multi_nocap:
$(SOLC) DemurrageTokenMultiNocap.sol --abi --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiNocap.json
$(SOLC) DemurrageTokenMultiNocap.sol --bin --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiNocap.bin
truncate -s -1 DemurrageTokenMultiNocap.bin
multi_cap:
$(SOLC) DemurrageTokenMultiCap.sol --abi --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiCap.json
$(SOLC) DemurrageTokenMultiCap.sol --bin --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiCap.bin
truncate -s -1 DemurrageTokenMultiCap.bin
multi: multi_nocap multi_cap
single_nocap: single_nocap:
$(SOLC) DemurrageTokenSingleNocap.sol --abi --evm-version byzantium | awk 'NR==4' > DemurrageTokenSingleNocap.json $(SOLC) DemurrageTokenSingleNocap.sol --abi --evm-version byzantium | awk 'NR==4' > DemurrageTokenSingleNocap.json
$(SOLC) DemurrageTokenSingleNocap.sol --bin --evm-version byzantium | awk 'NR==4' > DemurrageTokenSingleNocap.bin $(SOLC) DemurrageTokenSingleNocap.sol --bin --evm-version byzantium | awk 'NR==4' > DemurrageTokenSingleNocap.bin
truncate -s -1 DemurrageTokenSingleNocap.bin truncate -s -1 DemurrageTokenSingleNocap.bin
single_cap: single: single_nocap
$(SOLC) DemurrageTokenSingleCap.sol --abi --evm-version byzantium | awk 'NR>3' > DemurrageTokenSingleCap.json
$(SOLC) DemurrageTokenSingleCap.sol --bin --evm-version byzantium | awk 'NR>3' > DemurrageTokenSingleCap.bin
truncate -s -1 DemurrageTokenSingleCap.bin
single: single_nocap single_cap
test: all test: all
python ../python/tests/test_basic.py python ../python/tests/test_basic.py