ERC725 / ERC735 implementation

Implementation Image

At first, read this article and understand basic flow and usage of ERC725 and ERC735

Implementation Sample

Working sample code is here. This is origin protocol repo so that this is reliable.

Update above code for solidity compiler v0.5

Change return value obtaining and argument passing style of call

Where the mapping of a identity address and a user wallet address store?

In Origin Protocol case, UserRegistory contract hold the mapping

About the data structure passing to "call" function

A call function appear in approve funcion of ERC725, like as follow.

executions[_id].to.call.value(executions[_id].value)(executions[_id].data)

The structure of data is as follow

Web3 implementation examples

1. Creating calldata for execute function of ERC725

code:sample1.js

import web3 form 'web3'

import json from "/contracts/ClaimHolder.json"

const createCalldata = async (identityAddress, privateKey, claimIssuerAddress, uri) => {

// Create signatute

const hexedData = web3.utils.asciiToHex("this guy is totes legit")

const hashedDataToSign = web3.utils.soliditySha3(

identityAddress, 3, hexedData,)

// The private key must start form '0x...'

const sig = await this.web3.eth.accounts.sign(hashedDataToSign, privateKey).signature

// Create contract instance

const identityContract = new web3.eth.Contract(json.abi, identityAddress)

// Create calldata

const claimIssuer = claimIssuerAddress

const abicode = await identityContract.methods

.addClaim(3, 1, claimIssuer, sig, hexedData, uri)

.encodeABI();

return abicode

}

2. Adding claim to ClaimHolder contract

code: sample2.js

import web3 form 'web3'

import json from "/contracts/ClaimHolder.json"

async addClaim(identityAddress, calldata, account) {

const identityContract = new web3.eth.Contract(json.abi, identityAddress)

const tx = await identityContract.methods.execute(identityAddress, 0, calldata)

const receipt = await tx.send({ from: account, gasPrice: 100000000 })

return recept

}