Non-fungible tokens (NFTs) are all the rage these days, but their current manifestation (ERC721) is inefficient. It is not possible to move multiple tokens at the same time or package multiple tokens for e.g. deposit into a plasma child chain.
The following is a new design for an NFT token that allows aggregation of assets. The rest of the functionality can be inherited from ERC721.
contract NFT {
tokens mapping(address => mapping(bytes32 => uint));
| // Bytecode origin https://www.reddit.com/r/ethereum/comments/6ic49q/any_assembly_programmers_willing_to_write_a/dj5ceuw/ | |
| // Modified version of Vitalik's https://www.reddit.com/r/ethereum/comments/6c1jui/delegatecall_forwarders_how_to_save_5098_on/ | |
| // Credits to Jordi Baylina for this way of deploying contracts https://gist.github.com/jbaylina/e8ac19b8e7478fd10cf0363ad1a5a4b3 | |
| // Forwarder is slightly modified to only return 256 bytes (8 normal returns) | |
| // Deployed Factory in Kovan: https://kovan.etherscan.io/address/0xaebc118657099e2110c90494f48b3d21329b23eb | |
| // Example of a Forwarder deploy using the Factory: https://kovan.etherscan.io/tx/0xe995dd023c8336685cb819313d933ae8938009f9c8c0e1af6c57b8be06986957 | |
| // Just 66349 gas per contract |