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PolygonID On Chain Verifications

A basic tutorial on how to deploy a contract, and go through the proof process.


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Requirements

  • NVM Node v16.17.0
  • Yarn v1.22.19

Concept

There are 3 entities in SSI (Self-Sovereign Identify) for the "Trust Triangle" (https://www.okta.com/identity-101/self-sovereign-identity/).

1 - Owner

2 - Issuer

3 - Verifier


Deploy ERC20 Token

Step 1 - Create Configuration Files & Install Dependencies

cp .env.example .env;

yarn;

Fill in the following details to deploy the proper contract

File: ./.env

ETHERSCAN_API_KEY=
RPC_MUMBAI_URL=
WALLET_PRIVATE_KEY=

Step 2 - Deploy Contract

npx hardhat run scripts/erc20Deploy.ts --network mumbai;

# Expected output:
# Compiled x Solidity files successfully
# ERC20zkAirdrop deployed to 0xABc1...}

Step 3 - Create Claim

A - Sign up for https://platform-test.polygonid.com.

Platform Test Polygon ID

B - Create Schema

Create Schema

Configure Schema

Offer Claim

C - Claim

Claim

Claim Link

Polygon ID App

Connect Polygon ID Wallet

Re-Scan For Claim

Accept Claim

View Claim

Step 4 - Set ZKP Request

Modify the following file

File: ./scripts/erc20ZkpRequest.ts

    // Change to copied schemaHas from claim in Step 2C
    const schemaHash = "9c2498080a90d43cada7fec79eeee8de";
    // Changed to deployed contract
    const ERC20VerifierAddress = "0x085523dF632FEaAE3Ae232E0EBc31FaC9956ddAb";
    const schemaEnd = fromLittleEndian(hexToBytes(schemaHash));
    const query = {
        schema: ethers.BigNumber.from(schemaEnd),
        slotIndex: 2,
        operator: 2,
        // Change to 10 or value that you want to use (eg. everything greater than 10)
        value: [10, ...new Array(63).fill(0).map(i => 0)],
        circuitId,
    };

Set it on the contract:

npx hardhat run --network mumbai scripts/erc20ZkpRequest.ts;

# Expected output:
# Request set at:
# NOTE: May take a little bit to show up
# https://mumbai.polygonscan.com/tx/0x60ac...

Step 5 - QR Code Proof Request

Modify the following script:

File: ./htmlQRClaim/src/App.tsx

    // ...

    // Config
    // ========================================================
    // update with your contract address
    const DEPLOYED_CONTRACT_ADDRESS = "0xCfFEb70395C8E2A98d20Facf67122d638b18673c";

    /**
     * 
     */
    const qrProofRequestJson = proofRequest;
    qrProofRequestJson.body.transaction_data.contract_address = DEPLOYED_CONTRACT_ADDRESS;
    qrProofRequestJson.body.scope[0].rules.query.req = {
    "Date": {
        // NOTE: this value needs to match the erc20ZkpRequest.ts L34 or erc721ZkpRequest.ts L34
        "$gt": 10
    }
    };
    // NOTE1: if you change this you need to resubmit the erc10|erc721ZKPRequest
    // NOTE2: type is case-sensitive
    // You can generate new schemas via https://platform-test.polygonid.com
    qrProofRequestJson.body.scope[0].rules.query.schema = {
    "url": "https://s3.eu-west-1.amazonaws.com/polygonid-schemas/96c80e89-3c04-4762-8f4a-c39373571506.json-ld",
    "type": "MyCustomSchema"
    };

Run the local html QR code page

cd htmlQRClaim;
yarn dev;

# Expected output:
# VITE v3.2.0  ready in 238 ms
# 
#   ➜  Local:   http://127.0.0.1:5173/
#   ➜  Network: use --host to expose

Step 6 - Mint Airdrop With Proof

Mint

Generate Proof

Authenticate

Mint


Debugging Errors

Wrong Claim Schema Has Been Used For Proof Generation

Wrong Claim Schema Has Been Used For Proof Generation

Double check that that the schema has been set correctly in the following places:

File: ./scripts/erc20ZkpRequest.ts

// This should be copied from https://platform-test.polygonid.com
const schemaHash = "f91912b9332bb22be08b4e10fe9eda9a"; 

AND

Files: ./htmlQRClaim/src/App.tsx

// This should match the url and the type from https://platform-test.polygonid.com
qrProofRequestJson.body.scope[0].rules.query.schema = {
  "url": "https://s3.eu-west-1.amazonaws.com/polygonid-schemas/96c80e89-3c04-4762-8f4a-c39373571506.json-ld",
  "type": "MyCustomSchema"
};

Wrong Query Operator Has Been Used For Proof Generation

Wrong Query Operator Has Been Used For Proof Generation

Double check that the operator and the code for the operator is set correctly in the following places:

File: ./scripts/erc20ZkpRequest.ts

    const query = {
        schema: ethers.BigNumber.from(schemaEnd),
        slotIndex: 2,
        // see - https://0xpolygonid.github.io/tutorials/verifier/verification-library/zk-query-language/
        // 1 = equals
        // 2 = less-than
        // 3 = greater-than
        // 4 = in
        // 5 = not-in
        operator: 3,
        value: [10, ...new Array(63).fill(0).map(i => 0)],
        circuitId,
    };

AND

Files: ./htmlQRClaim/src/App.tsx

qrProofRequestJson.body.scope[0].rules.query.req = {
  "customNumberAttribute": {
    // see - https://0xpolygonid.github.io/tutorials/verifier/verification-library/zk-query-language/
    // NOTE: this value needs to match the erc20ZkpRequest.ts L34 or erc721ZkpRequest.ts L34
    // $eq = 1
    // $lt = 2
    // $gt = 3
    // $in = 4
    // $nin = 5
    "$gt": 12
  }
};

Wrong Comparison Value Has Been Used For Proof Generation

Wrong Comparison Value Has Been Used For Proof Generation

Double check that the value used for the condition is set correctly in the following places:

File: ./scripts/erc20ZkpRequest.ts

    const query = {
        schema: ethers.BigNumber.from(schemaEnd),
        slotIndex: 2,
        operator: 3,
        // Make sure this value (ex: 10) matches the other value
        value: [10, ...new Array(63).fill(0).map(i => 0)], 
        circuitId,
    };

AND

Files: ./htmlQRClaim/src/App.tsx

qrProofRequestJson.body.scope[0].rules.query.req = {
  "customNumberAttribute": {
    // Make sure this value (ex: 10) matches the other value
    "$gt": 10
  }
};

Proof Can Not Be Submitted More Than Once

Proof Can Not Be Submitted More Than Once

This is because you can only mint once with that specific proof.


Deploy ERC721 Token

Step 1 - Create Configuration Files & Install Dependencies For ERC721

See ERC20 - Step 1

Step 2 - Deploy Contract For ERC721

npx hardhat run scripts/erc721Deploy.ts --network mumbai;

# Expected output:
# Compiled x Solidity files successfully
# ERC721zkMint deployed to 0xABc1...}

Step 3 - Create Claim For ERC721

See ERC20 - Step 3

Step 4 - Set ZKP Request For ERC721

Modify the following file

File: ./scripts/erc721ZkpRequest.ts

    // Change to copied schemaHas from claim in Step 2C
    const schemaHash = "9c2498080a90d43cada7fec79eeee8de";
    // Changed to deployed contract
    const ERC721VerifierAddress = "0x085523dF632FEaAE3Ae232E0EBc31FaC9956ddAb";
    const schemaEnd = fromLittleEndian(hexToBytes(schemaHash));
    const query = {
        schema: ethers.BigNumber.from(schemaEnd),
        slotIndex: 2,
        operator: 2,
        // Change to 10 or value that you want to use (eg. everything greater than 10)
        value: [10, ...new Array(63).fill(0).map(i => 0)],
        circuitId,
    };

Set it on the contract:

npx hardhat run --network mumbai scripts/erc721ZkpRequest.ts;

# Expected output:
# Request set at:
# NOTE: May take a little bit to show up
# https://mumbai.polygonscan.com/tx/0x60ac...

Step 5 - QR Code Proof Request For ERC721

See ERC20 - Step 5

Step 6 - Mint NFT With Proof For ERC721

See ERC20 - Step 6

Step 7 - See On OpenSea

Go to your OpenSea Account, connect your wallet, and see the minted hex colour nft.

OpenSea Minted NFT

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