js-rln/example/index.js

import * as rln from "@waku/rln";

rln.create().then(async (rlnInstance) => {
  const credentials = rlnInstance.generateIdentityCredentials();

  //peer's index in the Merkle Tree
  const index = 5;

  // Create a Merkle tree with random members
  for (let i = 0; i < 10; i++) {
    if (i == index) {
      // insert the current peer's pk
      rlnInstance.insertMember(credentials.IDCommitment);
    } else {
      // create a new key pair
      const credentials = rlnInstance.generateIdentityCredentials(); // TODO: handle error
      rlnInstance.insertMember(credentials.IDCommitment);
    }
  }

  // prepare the message
  const uint8Msg = Uint8Array.from(
    "Hello World".split("").map((x) => x.charCodeAt())
  );

  // setting up the epoch
  const epoch = new Date();

  console.log("Generating proof...");
  console.time("proof_gen_timer");
  let proof = await rlnInstance.generateRLNProof(
    uint8Msg,
    index,
    epoch,
    credentials.IDSecretHash
  );
  console.timeEnd("proof_gen_timer");
  console.log("Proof", proof);

  try {
    // verify the proof
    let verifResult = rlnInstance.verifyRLNProof(proof, uint8Msg);
    console.log("Is proof verified?", verifResult ? "yes" : "no");
  } catch (err) {
    console.log("Invalid proof");
  }

  const provider = new ethers.providers.Web3Provider(window.ethereum, "any");

  const DEFAULT_SIGNATURE_MESSAGE =
    "The signature of this message will be used to generate your RLN credentials. Anyone accessing it may send messages on your behalf, please only share with the RLN dApp";

  const signer = provider.getSigner();
  const signature = await signer.signMessage(DEFAULT_SIGNATURE_MESSAGE);
  console.log(`Got signature: ${signature}`);

  const contract = await rln.RLNContract.init(rlnInstance, {
    address: rln.SEPOLIA_CONTRACT.address,
    provider: signer,
  });

  const event = await contract.registerMember(rlnInstance, signature);
  console.log(`Registered as member with ${event}`);
});