@erc725/smart-contracts

ERC725 Implementation

This package is currently in BETA, use with caution!

This package contains an implementation of ERC725 to make it as easy as possible to get started.
If you see ways to improve this implementation, you are welcome to create an issue or a pull request.

The package has the following contracts:

• ERC725X.sol: The execute part of ERC725, allows to execute any other smart contract. Uses ERC173 as a basis.
• ERC725Y.sol: The data part of ERC725, allows to attach any key-value data to a smart contract. Uses ERC173 as a basis.
• ERC725.sol: Combines both implementations: ERC725X.sol and ERC725Y.sol.
• ERC725Account.sol: An implementation that could be used for a smart contract based account.
  • Implements ERC1271.
  • Allows to receive native tokens (like ETH) and fires the event ValueReceived(address indexed sender, uint256 indexed value).
  • Sets the key hash keccak256('ERC725Type'): 0xee97c7dd2e734cf234c2ba0d83a74633e1ac7fc8a9fd779f8497a0109c71b993 to keccak256('ERC725Account'): 0xafdeb5d6e788fe0ba73c9eb2e30b8a4485e3a18fb31dd13e3b362f62a65c67a0 in the constructor.

Usage

To use in your project install via npm

npm install

And import in your contracts

import "erc725/contracts/ERC725/ERC725Account.sol";

contract MyContract is ERC725Account {
    ...
}

Development

Setup:

npm install

Run tests:

npm test

Run linter (solium):

npm run lint

Technical References

Interface IDs

The table below contains a list of ERC165 interface IDs used by the Solidity implementations of the ERC725 smart contracts.

Interface Name	Interface ID	Description
ERC725X	0x44c028fe	General executor
ERC725Y	0x5a988c0f	General key-value store
ERC725Account	0x63cb749b	ERC725X + ERC725Y + LSP1 + ERC1271
ERC165	0x01ffc9a7	Standard Interface Detection for Contracts
ERC1271	0x1626ba7e	Standard Signature Validation Method for Contracts
LSP1	0x6bb56a14	Universal Receiver entry function
LSP1Delegate	0xc2d7bcc1	Universal Receiver delegated to an other smart contract

The ERC725Account's interface ID is calculated as the XOR of the functions selectors from the interfaces it implements. Despite the fact that an ERC725Account is an ownable contract, the selectors from ERC173 (owner() and transferOwnership(address)) are omitted in the calculation.

  getData              // ERC725Y
^ setData              // ERC725Y
^ execute              // ERC725X
^ universalReceiver    // LSP1
^ isValidSignature     // ERC1271
= 0x63cb749b           // ERC725Account

Solc Contract details

Notice: you need the solc compiler installed locally to use this command. Installation instructions can be found in the solidity documentation

The repository offers a shell utility tool that generate details about each contracts (function selectors, storage layout, evm opcodes...). You can obtain them via the following command.

npm run solc

This will generate files and folders under /solc

solc
 |- bytecode/
 |- evm/
 |- metadata/
 |- opcodes/
 |- selectors/
 |- storage-layout/
 |- gas-costs.md