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.

1. ERC: Identity

2. Fabian Vogelsteller, web3.js and 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.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?

4. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?

5. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?

6. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?

7. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?
Claim 1
Physical
Claim 2
New Claim 3

8. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?

9. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?
Its all claims!

10. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
What is identity?

11. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog

12. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
Mastercoin
Counterparty
DigiX

13. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
ERC: Identity

14. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog

15. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
ERC: Identity
Keys Execution Claims

16. Fabian Vogelsteller, web3.js and 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.js and 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.js and 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.js and 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.js and 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.js and 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.js and 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.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
ERC: Identity
ERC 725 Identity
ERC 735 Claim Holder

24. Fabian Vogelsteller, web3.js and Mist Developer, Ethereum
@feindura
http://frozeman.de/blog
ERC: Identity
https://github.com/ethereum/EIPs/issues/735
https://github.com/ethereum/EIPs/issues/725
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