TRON-TIP712-DEMO
├─ build/contracts/
├─ contracts/
│ ├─ Migrations.sol
│ └─ Tip712Verifier.sol
├─ migrations/
│ └─ 2_deploy_tip712.js
├─ demo.js
├─ tronbox.js
├─ .env
├─ .env.sample
└─ package.json

const domain = { name: NAME, version: VERSION, chainId: CHAIN_ID, verifyingContract: VERIFYING_CONTRACT };

const types = {
Person: [{ name: ‘name’, type: ‘string’ }, { name: ‘wallet’, type: ‘address’ }],
Mail: [{ name: ‘from’, type: ‘Person’ }, { name: ‘to’, type: ‘Person’ }, { name: ‘contents’, type: ‘string’ }, { name: ‘nonce’, type: ‘uint256’ }]
};

const value = {
from: { name: ‘Cow’, wallet: signer },
to: { name: ‘Bob’, wallet: signer },
contents: ‘Hello TIP-712 on TRON!’,
nonce: Date.now()
};

let signature = await tronWeb.trx._signTypedData(domain, types, value);
let raw = signature.startsWith(‘0x’) ? signature.slice(2) : signature;
const vHex = raw.slice(128, 130);
if (vHex === ‘00’) raw = raw.slice(0, 128) + ‘1b’;
else if (vHex === ‘01’) raw = raw.slice(0, 128) + ‘1c’;
signature = ‘0x’ + raw;

const contract = await tronWeb.contract(abi, VERIFYING_CONTRACT);
const okOnChain = await contract.verify(
[[value.from.name, value.from.wallet],
[value.to.name, value.to.wallet],
value.contents,
value.nonce],
signer,
signature
).call();

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