VEYLA

// VeylaVault.sol — deployed on Passet Hub Testnet
// Solidity 0.8.28 compiled to PolkaVM bytecode

import "./interfaces/IXcm.sol";       // XCM precompile (0x...000a0000)
import "./interfaces/IERC20Precompile.sol"; // USDT pallet-assets

contract VeylaVault {
    address public constant DOT  = address(0);
    address public constant USDT = USDT_PRECOMPILE;

    // Route assets cross-chain via XCM precompile
    function sendCrossChain(
        address token,
        bytes calldata destination,
        bytes calldata xcmMessage
    ) external onlyOwner {
        if (!trustedDestinations[keccak256(destination)])
            revert UntrustedDestination();

        // Native call to Polkadot's XCM runtime
        IXcm(XCM_PRECOMPILE).send(destination, xcmMessage);

        lastRoutedAt = block.timestamp;
        emit RoutedCrossChain(token, destination, _tvl[token]);
    }

    // Yield: principal × APY × elapsed / (365d × 10_000)
    function _pendingYield(address user, address token)
        internal view returns (uint256)
    {
        uint256 principal = _balances[user][token];
        uint256 elapsed   = block.timestamp - _depositTimestamps[user][token];
        return (principal * _apyBps[token] * elapsed) / (365 days * 10_000);
    }
}