Authereum
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Introduction
Getting started
Live demos
Dapps using Authereum
Install
Integration
Web3 provider
Ethers Signer
StarkWare Provider
SDK
API Keys
Batched transactions
Verifying signatures
Testing
Browser compatibility
Contributing
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FAQ
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Web3 provider

Web3 Provider

Authereum is available as a Web3 provider.
Initialize the Authereum SDK and pass the provider to Web3:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('kovan')
​
const provider = authereum.getProvider()
const web3 = new Web3(provider)
Alternatively, the Authereum provider can be initialized directly.
import { AuthereumProvider } from 'authereum'
import Web3 from 'web3'
​
const provider = new AuthereumProvider('kovan')
const web3 = new Web3(provider)

Switch Networks

To switch networks, the provider will need to be reinitialized with the network name:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const networkName = 'rinkeby'
const authereum = new Authereum(networkName)
​
const provider = authereum.getProvider()
const web3 = new Web3(provider)

MetaMask and Web3 Browsers

Use web3 injected provider is available or use Authereum's web3 provider:
import Authereum from 'authereum'
import Web3 from 'web3'
​
let web3
​
if (window.ethereum) {
web3 = new Web3(window.ethereum)
} else if (window.web3) {
web3 = new Web3(window.web3.currentProvider)
} else {
const authereum = new Authereum('kovan')
web3 = new Web3(authereum.getProvider())
}
​
const accounts = await web3.eth.getAccounts()
console.log(accounts[0])

Using Script Tags

Using Web3 and Authereum libraries from CDNs and injecting web3 and the provider into the global window object:
<script src="https://cdn.jsdelivr.net/gh/ethereum/[email protected]/dist/web3.min.js"></script>
<script src="https://unpkg.com/[email protected]/authereum.js"></script>
<script>
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
window.ethereum = provider
window.web3 = new Web3(provider)
</script>

Provider Options

See the Authereum SDK guide to see the options available.

Examples

Logging in

Call the enable method on the provider to login:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
await provider.enable()
​
// Alternatively
// await web3.currentProvider.enable()

Logging out

Call the disable method on the provider to logout:
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
await provider.disable()
​
// Alternatively
// await web3.currentProvider.disable()

Is Connected

Check if user is connected to dapp.
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const isConnected = provider.isConnected()
​
console.log(isConnected)

Get Accounts

Get connected account address:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('kovan')
const web3 = new Web3(authereum.getProvider())
​
const accounts = await web3.eth.getAccounts()
console.log(accounts[0])
​
// Alternatively
// const account = await web3.eth.getCoinbase()
// console.log(account)

Get Balance

Reading the account ETH balance:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('kovan')
const web3 = new Web3(authereum.getProvider())
​
const accounts = await web3.eth.getAccounts()
const balance = await web3.eth.getBalance(accounts[0])
console.log(balance)

Detecting Authereum web3 provider

Example of how to check if web3 provider is an Authereum provider:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
console.log(provider.isAuthereum)
​
// Alternatively
// console.log(web3.currentProvider.isAuthereum)

Sign Message

Example of how to sign a message:
import Authereum from 'authereum'
​
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const account = (await provider.getAccounts())[0]
const message = 'hello world'
const signature = await web3.eth.sign(message, account)
console.log(signature)

Sign Personal Message

Example of how to sign a personal message:
import Authereum from 'authereum'
​
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const account = (await provider.getAccounts())[0]
const message = 'hello world'
const signature = await web3.eth.personal.sign(message, account)
console.log(signature)

Sign Typed Data

Example of how to sign typed data using EIP-712:
import Authereum from 'authereum'
​
const authereum = new Authereum('kovan')
const provider = authereum.getProvider()
const from = (await provider.getAccounts())[0]
const payload = [
{
type: 'string',
name: 'username',
value: 'alice'
},
{
type: 'uint32',
name: 'userId',
value: '12345'
}
]
​
​
const params = [payload, from]
const method = 'eth_signTypedData'
​
provider.sendAsync({
id: 1,
method,
params,
from
}, (error, res) => {
if (error) throw error
console.log(res.result)
})

Sign Transaction

Example of how to sign a transaction:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const tx = {
to: '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b',
value: '10000000000000000'
}
​
const { raw } = await web3.eth.signTransaction(tx)
const transactionHash = web3.utils.sha3(raw)
​
console.log(transactionHash)

Send Transaction

Example of how to send a transaction:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const tx = {
to: '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b',
value: '10000000000000000'
}
​
const { transactionHash } = await web3.eth.sendTransaction(tx)
​
console.log(transactionHash)

Send Transaction Batch

Example of how to send a transaction batch (2 ETH transfers):
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const txs = [
{
to: '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b',
value: '10000000000000000',
gasLimit: '1000000'
}, {
to: '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b',
value: '10000000000000000',
gasLimit: '1000000'
}
]
​
const { transactionHash } = await provider.sendTransactionBatch(txs)
​
console.log(transactionHash)
Example of how to send a transaction batch (DAI approve and transferFrom):
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const txs = [
// Approve
{
to: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
value: '0',
gasLimit: '1000000',
data: '0x095ea7b3000000000000000000000000e4c9194962532feb467dce8b3d42419641c6ed2e0000000000000000000000000000000000000000000000008c4cb6a94641cfbd'
},
// transferFrom
{
to: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
value: '0',
gasLimit: '1000000',
data: '0x23b872dd0000000000000000000000003b18c73ed8ff086695b6b9b314843dfde9fad1c600000000000000000000000018d3d5d945353f46f0f5ca7b808c8a6443e6cbb40000000000000000000000000000000000000000000000008c4cb6a94641cfbd'
}
]
​
const { transactionHash } = await provider.sendTransactionBatch(txs)
​
console.log(transactionHash)

Estimate Gas Batch

Example of how to estimate a transaction batch (2 ETH transfers):
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const txs = [
{
to: '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b',
value: '10000000000000000'
}, {
to: '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b',
value: '10000000000000000'
}
]
​
const { transactionHash } = await provider.estimateGasBatch(txs)
​
console.log(transactionHash) // [17894, 11845]
Example of how to estimate a transaction batch (DAI approve and transferFrom):
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const txs = [
// Approve
{
to: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
value: '0',
data: '0x095ea7b3000000000000000000000000e4c9194962532feb467dce8b3d42419641c6ed2e0000000000000000000000000000000000000000000000008c4cb6a94641cfbd'
},
// transferFrom
{
to: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
value: '0',
data: '0x23b872dd0000000000000000000000003b18c73ed8ff086695b6b9b314843dfde9fad1c600000000000000000000000018d3d5d945353f46f0f5ca7b808c8a6443e6cbb40000000000000000000000000000000000000000000000008c4cb6a94641cfbd'
}
]
​
const { transactionHash } = await provider.estimateGasBatch(txs)
​
console.log(transactionHash) // [10955,7057]

ERC20: Token Balance

Example of how to read token balance:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"name": "balance",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}]
​
const token = '0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359'
const instance = await new web3.eth.Contract(abi, token)
​
const account = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const amount = await instance.methods.balanceOf(account).call()
​
console.log(amount)

ERC20: Token Allowance

Example of how to read token allowance:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
},
{
"name": "_spender",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}]
​
const token = '0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359'
const instance = await new web3.eth.Contract(abi, token)
​
const owner = (await web3.eth.getAccounts())[0]
const spender = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const allowance = await instance.methods.allowance(owner, spender).call()
​
console.log(allowance)

ERC20: Token Approve

Example of how to do a token approve call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "_spender",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const spender = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const value = '1000000000000000000'
const { transactionHash } = await instance.methods.approve(spender, value).send({ from })
​
console.log(transactionHash)

ERC20: Token Transfer

Example of how to do a token transfer call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const to = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const value = '1000000000000000000'
const { transactionHash } = await instance.methods.transfer(to, value).send({ from })
​
console.log(transactionHash)

ERC20: Token Transfer From

Example of how to do a token transfer from call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "_from",
"type": "address"
},
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const to = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const value = '1000000000000000000'
const { transactionHash } = await instance.methods.transferFrom(from, to, value).send({ from })
​
console.log(transactionHash)

ERC721: Owner Of

Example of how to check owner of NFT:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": true,
"inputs": [
{
"name": "tokenId",
"type": "uint256"
}
],
"name": "ownerOf",
"outputs": [
{
"name": "",
"type": "address"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}]
​
const token = '0x6EbeAf8e8E946F0716E6533A6f2cefc83f60e8Ab'
const instance = await new web3.eth.Contract(abi, token)
​
const tokenId = '580767'
const owner = await instance.methods.ownerOf(tokenId).call()
​
console.log(owner)

ERC721: Get Approved

Example of how to check if NFT is approved:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": true,
"inputs": [
{
"name": "tokenId",
"type": "uint256"
}
],
"name": "getApproved",
"outputs": [
{
"name": "",
"type": "address"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}]
​
const token = '0x6EbeAf8e8E946F0716E6533A6f2cefc83f60e8Ab'
const instance = await new web3.eth.Contract(abi, token)
​
const tokenId = '580767'
const to = await instance.methods.getApproved(tokenId).call()
​
console.log(to)

ERC721: Approve

Example of how to do a NFT approve call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"name": "approve",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x06012c8cf97bead5deae237070f9587f8e7a266d'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const to = '0x6EbeAf8e8E946F0716E6533A6f2cefc83f60e8Ab'
const tokenId = '580767'
const { transactionHash } = await instance.methods.approve(to, tokenId).send({ from })
​
console.log(transactionHash)

ERC721: Transfer

Example of how to do a NFT transfer call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x06012c8cf97bead5deae237070f9587f8e7a266d'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const to = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const tokenId = '1667849'
const { transactionHash } = await instance.methods.transfer(from, to, tokenId).send({ from })
​
console.log(transactionHash)

ERC721: Transfer From

Example of how to do a NFT transfer from call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x6EbeAf8e8E946F0716E6533A6f2cefc83f60e8Ab'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const to = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const tokenId = '580767'
const { transactionHash } = await instance.methods.transferFrom(from, to, tokenId).send({ from })
​
console.log(transactionHash)

ERC721: Safe Transfer From

Example of how to do a NFT safe transfer from call:
import Authereum from 'authereum'
import Web3 from 'web3'
​
const authereum = new Authereum('mainnet')
const provider = authereum.getProvider()
const web3 = new Web3(provider)
​
const abi = [{
"constant": false,
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "tokenId",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}]
​
const token = '0x6EbeAf8e8E946F0716E6533A6f2cefc83f60e8Ab'
const instance = await new web3.eth.Contract(abi, token)
​
const from = (await web3.eth.getAccounts())[0]
const to = '0x22d491Bde2303f2f43325b2108D26f1eAbA1e32b'
const tokenId = '580767'
const data = '0x00'
const { transactionHash } = await instance.methods.safeTransferFrom(from, to, tokenId, data).send({ from })
​
console.log(transactionHash)

Validating Signatures (ecrecover)

See the Verifying Signatures page.
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Outline
Web3 Provider
Switch Networks
MetaMask and Web3 Browsers
Using Script Tags
Provider Options
Examples
Logging in
Logging out
Is Connected
Get Accounts
Get Balance
Detecting Authereum web3 provider
Sign Message
Sign Personal Message
Sign Typed Data
Sign Transaction
Send Transaction
Send Transaction Batch
Estimate Gas Batch
ERC20: Token Balance
ERC20: Token Allowance
ERC20: Token Approve
ERC20: Token Transfer
ERC20: Token Transfer From
ERC721: Owner Of
ERC721: Get Approved
ERC721: Approve
ERC721: Transfer
ERC721: Transfer From
ERC721: Safe Transfer From
Validating Signatures (ecrecover)