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Version: v1.4

Allow

The allowance concept is well known from the EVM contracts like ERC20. In ISC, we have a similar concept for our native assets. You might want to use this, for example, to send native assets to L1 (which includes sending tokens to other L1 chain accounts).

Example Code​

1. Create the allow Function​

Create a function which allows an address or contract to access a specific ID of your account:

function allow(address _address, bytes32 _allowanceNFTID) public {

2. Create the ISCAssets object​

Create an ISCAssets object to pass as allowance:

NFTID[] memory nftIDs = new NFTID[](1);
nftIDs[0] = NFTID.wrap(_allowanceNFTID);
ISCAssets memory assets;
assets.nfts = nftIDs;

3. Use the Assets as Allowance​

With that asset, you can call allow to allow address to take our NFT:

ISC.sandbox.allow(_address, assets);

Full Example Code​

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@iota/iscmagic/ISC.sol";

contract Allowance {
    function allow(address _address, bytes32 _allowanceNFTID) public {
        NFTID[] memory nftIDs = new NFTID[](1);
        nftIDs[0] = NFTID.wrap(_allowanceNFTID);
        ISCAssets memory assets;
        assets.nfts = nftIDs;
        ISC.sandbox.allow(_address, assets);
    }
}