CRYPTO DEV SIGNER

This package is written because at the time no good solution seemed to exist for solving the following combined requirements and issues:

• A service has custody of its users' private keys.
• The are a large number of private keys involved (hundreds of thousands and up).
• Need to sign transactions conforming to EIP-155, with the ability to arbitrarily specify the "chain id".
• Do not want to store the keys inside an ethereum node, especially not the one connected to the network.
• Want to use the "standard" web3 JSON-RPC interface, so that the component can be easily replaced later.
• Multiple providers don't work on either web3.js and/or web3.py.
• As a bonus, provide a practical keystore solution for testing in general for web3 projects.

TECHNICAL OVERVIEW

Scripts

When installed with pip/setuptools, this package provides a Unix socket IPC server as crypto-dev-daemon implementing the following web3 json-rpc methods:

• web3.eth.personal.newAccount
• web3.eth.personal.signTransaction
• web3.eth.signTransaction

Classes

The classes and packages provided are:

keystore

• Keystore: Interface definition
• ReferenceKeystore: Implements the Keystore interface, with a postgresql backend expecting sql schema as defined in ReferenceKeystore.schema

transaction

• Transaction: Interface definition.
• EIP155Transaction: Creates transaction serializations appropriate for EIP155 replay protected signatures. Accepts a web3 format transaction dict as constructor argument together with nonce and optional chainId.

signer

• Signer: Interface definition. Its signTransaction method expects an object implementing the Transaction interface.
• ReferenceSigner Implements Signer, accepting a single argument of type Keystore interface.

VERSION

This software is in alpha state.

Current version is 0.2.5

LICENSE

GPLv3

LEGAL MUMBO-JUMBO

No responsibility assumed for any use of this software. You're on your own, as usual.