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ERC Identity
The document discusses ERC identity, detailing the roles and functionalities of identities within the Ethereum ecosystem as described by Fabian Vogelsteller, a developer of web3.js and Mist. It explains how identities can execute claims, validate transactions, and interact both on-chain and off-chain. It also highlights the mechanisms for checking claims and the importance of issuer verification in the process.
In this document
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Introduction to the concept of identity in the context of Ethereum. Discusses claims as the essence of identity.
Introduction to ERC standards related to identity: Mastercoin, Counterparty, and DigiX.
Explains how identity interacts with actions such as transactions, claims signing, and contract execution.
Details on how claims are added and managed, including issuer signatures and claim references.
Differentiates between identity usage off-chain and on-chain, with processes like claim checking outlined.
Describes the steps involved in verifying identity claims, including signature verification.
Details the ERC 725 identity and ERC 735 claim holder standards, with links for further contribution.
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ERC Identity
- 1.
- 2. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog Fabian Vogelsteller Ethereum Wallet Mist Browser web3.js Flat File CMS ERC-20: Token StandardT
- 3. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity?
- 4. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity?
- 5. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity?
- 6. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity?
- 7. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity? Claim 1 Physical Claim 2 New Claim 3
- 8. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity?
- 9. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity? Its all claims!
- 10. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog What is identity?
- 11. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog
- 12. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog Mastercoin Counterparty DigiX
- 13. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity
- 14. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog
- 15. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Keys Execution Claims
- 16. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Keys Can be actors (logins, proofs, access) Can make transactions Can sign documents Can sign claims …
- 17. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Execution Act as your identity (execute contracts, voting, ...) Add claims to other identities and contracts …
- 18. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Can be added by anyone Need approval Can't be changed without your permission, but removed Contain issuer signature Contain claim reference (hash, bit-mask) … Claims
- 19. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Claims { uint256 claimType; address issuer; uint256 signatureType; bytes signature; // holder.address + claimType + claim bytes claim; string uri; }
- 20. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Off-Chain Usage 1. Random String 2. Random String + Identity Address -> signed 3. getClaim() 4. Check claim
- 21. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity On-Chain Usage 2. getClaim() 1. superCoolFunc() 3. Check claim (check claim signature get key) 4. Check if claim issuer still holds key from signature Issuer 5. continue execution of superCoolFunc()
- 22. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity Claim Checking { uint256 claimType; address issuer; uint256 signatureType; bytes signature; // holder.address + claimType + claim bytes claim; string uri; } 1. Check which signature type is used 2. Build the signed hash keccak256(address holder_address + uint256 _claimType + bytes _claim) 3. Recover address k from signature 4. Check if issuer identity contract still holds address k 5.
- 23. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity ERC 725 Identity ERC 735 Claim Holder
- 24. Fabian Vogelsteller, web3.jsand Mist Developer, Ethereum @feindura http://frozeman.de/blog ERC: Identity https://github.com/ethereum/EIPs/issues/735 https://github.com/ethereum/EIPs/issues/725 Discuss and Contribute!