Create an attester's wallet
const attester = new ethers.Wallet(
ATTESTER_PRIVATE_KEY,
provider
)
Attester signs up in UniRep smart contract
const tx = await contract
.connect(attester)
.attesterSignUp()
Then the attester can get his own attester ID
const attesterID = await contract.attesters(attester.address)
console.log(attesterID)