diff --git a/python/eth_accounts_index/data/AccountsIndex.bin b/python/eth_accounts_index/data/AccountsIndex.bin
index 047bcc2..35616b6 100644
--- a/python/eth_accounts_index/data/AccountsIndex.bin
+++ b/python/eth_accounts_index/data/AccountsIndex.bin
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/python/eth_accounts_index/data/AccountsIndex.metadata.json b/python/eth_accounts_index/data/AccountsIndex.metadata.json
index 68fba60..dd8b478 100644
--- a/python/eth_accounts_index/data/AccountsIndex.metadata.json
+++ b/python/eth_accounts_index/data/AccountsIndex.metadata.json
@@ -1 +1 @@
-{"compiler":{"version":"0.8.18+commit.87f61d96"},"language":"Solidity","output":{"abi":[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_account","type":"address"},{"indexed":false,"internalType":"bool","name":"_active","type":"bool"}],"name":"AddressActive","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"AddressAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"AddressRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"WriterAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"WriterDeleted","type":"event"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"activate","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"add","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_writer","type":"address"}],"name":"addWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"deactivate","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_writer","type":"address"}],"name":"deleteWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_i","type":"uint256"}],"name":"entry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"entryCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"have","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"isActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"remove","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"time","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"AccountsIndex.sol":"AccountsIndex"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"AccountsIndex.sol":{"keccak256":"0x29486989a6ef2c1dc0f2ea6fc88f793478b02014ea57da4da592cca7d2aec1f6","license":"AGPL-3.0-or-later","urls":["bzz-raw://5048dc60210f008f6fb46fe79a9d1aaa7a39c2947b4cc11a723fea918b993174","dweb:/ipfs/QmVbVeHc4uRE4T6gHKEr6fCWPpcQDtVGhfs2XC5P6AG4BD"]}},"version":1}
+{"compiler":{"version":"0.8.18+commit.87f61d96"},"language":"Solidity","output":{"abi":[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_account","type":"address"},{"indexed":false,"internalType":"bool","name":"_active","type":"bool"}],"name":"AddressActive","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"AddressAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"AddressRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"WriterAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_account","type":"address"}],"name":"WriterDeleted","type":"event"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"activate","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"add","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_writer","type":"address"}],"name":"addWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"deactivate","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_writer","type":"address"}],"name":"deleteWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_i","type":"uint256"}],"name":"entry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"entryCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"have","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"isActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"remove","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"time","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}],"devdoc":{"kind":"dev","methods":{},"version":1},"userdoc":{"kind":"user","methods":{},"version":1}},"settings":{"compilationTarget":{"AccountsIndex.sol":"AccountsIndex"},"evmVersion":"byzantium","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"AccountsIndex.sol":{"keccak256":"0xd889ca99f06c6854bb0b347a3661421b9eb7726bf0940507a51ccc0e71895a5f","license":"AGPL-3.0-or-later","urls":["bzz-raw://fa6834759f7015ad9eec0b636e0c688fb1aaa9a2ccaacae8f4335e0d4da75e17","dweb:/ipfs/QmSs2ZNLNkFLiZeAFqs3S9mGW8BfuhZjgNMw5gzMwdveUg"]}},"version":1}
diff --git a/solidity/AccountsIndex.sol b/solidity/AccountsIndex.sol
index c316b85..241df9e 100644
--- a/solidity/AccountsIndex.sol
+++ b/solidity/AccountsIndex.sol
@@ -39,7 +39,7 @@ contract AccountsIndex {
 
 	// Implements Writer
 	function addWriter(address _writer) public returns (bool) {
-		require(owner == msg.sender);
+		require(owner == msg.sender, 'ERR_AXX');
 		isWriter[_writer] = true;
 		emit WriterAdded(_writer);
 		return true;
@@ -47,7 +47,7 @@ contract AccountsIndex {
 
 	// Implements Writer
 	function deleteWriter(address _writer) public returns (bool) {
-		require(owner == msg.sender);
+		require(owner == msg.sender, 'ERR_AXX');
 		delete isWriter[_writer];
 		emit WriterDeleted(_writer);
 		return true;
@@ -75,8 +75,8 @@ contract AccountsIndex {
 		uint256 i;
 		uint256 l;
 
-		require(isWriter[msg.sender]);
-		require(this.have(_account));
+		require(isWriter[msg.sender], 'ERR_AXX');
+		require(this.have(_account), 'ERR_ACL');
 
 		l = entryList.length - 1;
 
@@ -92,8 +92,9 @@ contract AccountsIndex {
 
 	// Implements AccountsIndexMutable
 	function activate(address _account) external returns (bool) {
-		require(isWriter[msg.sender]);
-		require(entryIndex[_account] > 0 && entryIndex[_account] & blockedField == blockedField);
+		require(isWriter[msg.sender], 'ERR_AXX');
+		require(entryIndex[_account] > 0, 'ERR_NOT_FOUND');
+	        require(entryIndex[_account] & blockedField == blockedField, 'ERR_NOT_BLOCKED');
 		entryIndex[_account] >>= 129;
 		emit AddressActive(_account, true);
 		return true;
@@ -102,7 +103,8 @@ contract AccountsIndex {
 	// Implements AccountsIndexMutable
 	function deactivate(address _account) external returns (bool) {
 		require(isWriter[msg.sender]);
-		require(entryIndex[_account] > 0 && entryIndex[_account] & blockedField == 0);
+		require(entryIndex[_account] > 0, 'ERR_NOT_FOUND');
+		require(entryIndex[_account] & blockedField == 0, 'ERR_NOT_ACTIVE');
 		entryIndex[_account] <<= 129;
 		entryIndex[_account] |= blockedField;
 		emit AddressActive(_account, false);
@@ -134,7 +136,7 @@ contract AccountsIndex {
 	// Implements EIP173
 	function transferOwnership(address _newOwner) public returns (bool) {
 		address oldOwner;
-		require(msg.sender == owner);
+		require(msg.sender == owner, 'ERR_AXX');
 
 		oldOwner = owner;
 		owner = _newOwner;