Deep dive into building an off-chain reward vault that produces verifiable on-chain claim vouchers without upfront gas.
Forcing non-crypto native users to immediately purchase native network tokens (POL) to interact with staking interfaces causes massive user drop-off. To eliminate this, we designed a gasless reward structure powered by EIP-712 structured cryptographic signatures.
The Verification Flow
- User actions are audited off-chain inside our secure Cloudflare Worker framework.
- If verified, the system constructs a typed data struct detailing the specific transaction limits (
recipient,amount,nonce). - The platform’s signer key cryptographically signs the structural hash of this exact payload.
// High-level conceptual checking mechanism
function verifyVoucher(Voucher calldata voucher, bytes calldata signature) public view returns (bool) {
bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
VOUCHER_TYPEHASH,
voucher.recipient,
voucher.amount,
voucher.nonce
)));
return ECDSA.recover(digest, signature) == trustedSigner;
}
Users can store their earned vouchers inside their virtual vaults and execute a single batch transaction to claim their real assets when gas fees are lowest.
