ERC Identity

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

@feindura
What is identity?

@feindura
What is identity?
Claim 1
Physical
Claim 2
New Claim 3

@feindura
What is identity?
Its all claims!

@feindura

@feindura
Mastercoin
Counterparty
DigiX

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ERC: Identity

@feindura
ERC: Identity
Keys Execution Claims

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ERC: Identity Keys
Can be actors (logins, proofs, access)
Can make transactions
Can sign documents
Can sign claims
…

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ERC: Identity Execution
Act as your identity (execute contracts, voting, ...)
Add claims to other identities and contracts
…

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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

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ERC: Identity Claims
{
uint256 claimType;
address issuer;
uint256 signatureType;
bytes signature; // holder.address + claimType + claim
bytes claim;
string uri;
}

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ERC: Identity Off-Chain Usage
1. Random String
2. Random String +
Identity Address 
-> signed
3. getClaim()
4. Check claim

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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()

@feindura
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.

@feindura
ERC: Identity
ERC 725 Identity
ERC 735 Claim Holder

@feindura
ERC: Identity
https://github.com/ethereum/EIPs/issues/735
https://github.com/ethereum/EIPs/issues/725
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ERC Identity

ERC Identity

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