Polygon ID SBT Age Credential

This is a basic Hardhat project showcasing how to create a Soulbound Token using an Age Credential from Polygon ID!

Tutorial: Video coming soon

Presentation Slids: https://pitch.com/public/2ac4415d-fcf6-4ad2-ac7f-1427483b8ece

This tutorial uses Hardhat as a development environment and Polygon Mumbai testnet as the network.

Polygon ID Wallet setup

Download the Polygon ID mobile app on the Google Play or Apple app store
Open the app and set a pin for security
Follow the Issue a Polygon ID claim doc to issue yourself a KYC Age Credential attesting your date of birth.

Instructions to compile and deploy the smart contract

Create a .env file in the root of this repo. Copy in .env.sample to add keys touch .env
Install dependencies npm i
Compile smart contracts npx hardhat compile
Deploy smart contracts npx hardhat run --network mumbai scripts/deploy.js

results in x tx hash: 0xecf178144CceC09417412D66E2ecC8a2841eE228
example contract creation: https://mumbai.polygonscan.com/address/0xecf178144ccec09417412d66e2ecc8a2841ee228

Update the ERC721VerifierAddress variable in scripts/set-request.js with your deployed contract address
Run set-request to send the zk request to the smart contract npx hardhat run --network mumbai scripts/set-request.js
- Successful tx means the age query has been set up: https://mumbai.polygonscan.com/tx/0x2ddb2db7b3d35cf7cdf658209b257fd2a51c49df2249bf46ede8979eb8410ffb

Claim SBT from a frontend

Design a proof request (see my example in qrValueProofRequestExample.json) and more info in the docs: Query Based Requests
- Update the contract_address field to your deployed contract address
Create a frontend with a QR code to the proof request. Codesandbox example A user should be able to scan the QR code from the Polygon ID app and trustlessly prove that they are old enough to mint an SBT

More Resources

Additional Tutorials from Steph and Manny: https://github.com/oceans404/tutorial-examples/tree/main/on-chain-verification https://github.com/codingwithmanny/polygonid-on-chain-verification

Starter kit from Steph for using API in a frontend: https://github.com/oceans404/generate-frontend-polygon-id-issuer