EIP-725: Proxy Account Source

AuthorFabian Vogelsteller, Tyler Yasaka
TypeStandards Track

Simple Summary

A standard interface for a simple proxy account.


The following describes standard functions for a unique identifiable proxy account to be used by humans, groups, organisations, objects and machines. The proxy has 2 abilities: (1) it can execute arbitrary contract calls, and (2) it can hold arbitrary data through a generic key/value store. One of these keys should hold the owner of the contract. The owner may be an address or a key manager contract for more complex management logic. Most importantly, this contract should be the reference point for a long-lasting identifiable profiles.


Standardizing a minimal interface for an proxy account allows third parties to interact with various proxy accounts contracts in a consistent manner. the benefit is a persistent account that is independent from single keys and can attach an arbitrary amount of information to verifiy, or enhance the accounts purpose.




Returns the current owner

address public owner;


Changes the current owner. MUST only be called by the current owner of the contract.

function changeOwner(address _owner);

Triggers Event: OwnerChanged


Returns the data at the specified key.

function getData(bytes32 _key) external view returns (bytes _value);


Sets the data at a specific key. MUST only be called by the current owner of the contract.

Triggers Event: DataChanged

function setData(bytes32 _key, bytes _value) external;


Executes an action on other contracts or a transfer of the blockchains native cryptocurrency. MUST only be called by the current owner of the contract.

function execute(uint256 _operationType, address _to, uint256 _value, bytes _data) external;

The operationType should represent the assembly operation as follows:

  • 0 for call
  • 1 for create

Others may be added in the future. Inspired by ERC-1077 and Gnosis



MUST be triggered when setData was successfully called.

event DataChanged(bytes32 indexed key, bytes value);


MUST be triggered when execute creates a new contract using the _operationType 1.

event ContractCreated(address indexed contractAddress);


MUST be triggered when changeOwner was successfully called.

event OwnerChanged(address indexed ownerAddress);


This contract is controlled by the owner. The owner can be a smart contract or an address, or itself.

Data keys

Data keys, should be the keccak256 hash of a type name. e.g. myNewKeyType is 0xa94996022594f93c34a730df0ae89d1ecd69dff98c17d0387e69ce58346323a4

Multiple keys of the same type

Multiple keys for the same key type must add a keyTypeName-1 at the end of the key type.

This would looks as follows for myNewKeyType:
version 0 myNewKeyType: 0xa94996022594f93c34a730df0ae89d1ecd69dff98c17d0387e69ce58346323a4
version 1 myNewKeyType-1: 0xb6dace1ed14874742c4d1b8cd9b270305176f769e0ae22118a02c2db4e620f29
version 2 myNewKeyType-2: 0x6cc96a01de588f4550e8c3a821aed065ae7897f8dfb61836c78c0389e499d9ed

Anyone that would like to standardize a new data key should make a pull request to update the table below.

Name Description Key value
owner The owner of the proxy account 0x0000000000000000000000000000000000000000000000000000000000000000 left padded owner address, e.g. 0x000000000000000000000000de0B295669a9FD93d5F28D9Ec85E40f4cb697BAe
735 The proxy accounts claim holder contract (per ERC-735) 0xb0f23aea7d77ce19f9393243a7b50a3bcaac893c7d68a5a309dea7cacf035fd0 left padded address of the claim holder contract, e.g. 0x000000000000000000000000de0B295669a9FD93d5F28D9Ec85E40f4cb697BAe
780 The proxy accounts claim holder contract (per ERC-735) 0xdaf52dba5981246bcf8fd7c6b00dce587fdcf5e2a95b281eea95dcd1376afdcd left padded address of the claim registry contract, e.g. 0x000000000000000000000000de0B295669a9FD93d5F28D9Ec85E40f4cb697BAe


The purpose of an identity proxy is to allow an entity to exist as a first-class citizen in Ethereum, with the ability to execute arbitrary contract calls. At that same time the proxy account should be managed by an arbitrary simple or complex logic.

It also opens up the possibility of meta transactions, where a third party can send a transaction to the owner contract, that then verifies the execution permission based on a signed message.

It further allows any information to be attached to that proxy accounts which can be in the forms of claims via ERC-735 or ERC-780, or any arbitrary new systems and protocols.

This specification was chosen to allow the most flexibility and experimentation around verifiable manageable accounts.


Solidity Interface

pragma solidity ^0.5.4;

interface ERC725 {
    event DataChanged(bytes32 indexed key, bytes32 indexed value);
    event OwnerChanged(address indexed ownerAddress);
    event ContractCreated(address indexed contractAddress);

    // address public owner;

    function changeOwner(address _owner) external;
    function getData(bytes32 _key) external view returns (bytes32 _value);
    function setData(bytes32 _key, bytes32 _value) external;
    function execute(uint256 _operationType, address _to, uint256 _value, bytes calldata _data) external;

Additional References

Copyright and related rights waived via CC0.


Please cite this document as:

Fabian Vogelsteller, Tyler Yasaka, "EIP-725: Proxy Account [DRAFT]," Ethereum Improvement Proposals, no. 725, October 2017. [Online serial]. Available: https://eips.ethereum.org/EIPS/eip-725.