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This smart contract it will allow to wrap and unwrap an ERC-1155 into an ERC-20 token. To make this possible the contract will create a relationship between the contract and an ERC-20 bytecode generated on getWrapped1155DeployBytecode using the Wrapped1155Factory.
For a token name WrappedERC-1155 (hex"557f577261707065644552432d31313535"), symbol WMT (hex"574d54"), and 18 decimals (hex"12") this is the returned bytecode:
0x73d7acd2a9fd159e69bb102a1ca21c9a3e3a5f771b3d55737ef2e0048f5baede046f6bf797943daf4ed8cb476020557f00000000000000000000000000000000000000000000000000000000000000006040557f577261707065644552432d313135350000000000000000000000000000001e60c0557f574d54000000000000000000000000000000000000000000000000000000000660e055601261010055602c6040518160a08237f33d3d3d3d363d3d37363d73d840735f4b6a0d1af8fa48ece560f4778c0073975af43d3d93803e602a57fd5bf3
Here are the following opcodes used for that method:
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0x73: Pushes 20 bytes to memory, in this case the address of the factory.
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0x3d55: 3d -> return datasize allows us to push a 0 onto stack with minimal gas costs. 55-> stores the data in stack storage 1 (factory address) at slot specified in stack storage 0 (0).
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0x600255: 0x6002 -> push the next 1 byte of the instruction data onto stack (02) 0x55-> Stores the data in stack storage 1 (tokenId) at slot specified in stack storage 0 (02).
To deploy cheap contract there is a EIP-1167 Minimal Proxy contract that will especify a minimal bytecode implementation that delegates all calls to a known, fixed address. The fixed address used for this will be erc20Implementation as a new Wrapped1155 which will be allowed to mint and burn ERC-20 by the Wrapped1155Factory contract to generate the tokens when Conditional Token contract transfer the conditional token (safeTransferFrom) using the onERC1155Received.
The 1155-to-20 use the More-Minimal Proxy bytecode by Oage. Here is the table of the bytecode instructions:
0x3d3d3d3d363d3d37363d73{adress(erc20Implementation)}5af43d3d93803e602a57fd5bf3pc op / pushdata opcode stack (top on the left)
---- ------------- ------------------ ------------------------
0x00 3d returndatasize 0
0x01 3d returndatasize 0 0
0x02 3d returndatasize 0 0 0
0x03 3d returndatasize 0 0 0 0
0x04 36 calldatasize cds 0 0 0 0
0x05 3d returndatasize 0 cds 0 0 0 0
0x06 3d returndatasize 0 0 cds 0 0 0 0
0x07 37 calldatacopy 0 0 0 0
0x08 36 calldatasize cds 0 0 0 0
0x09 3d returndatasize 0 cds 0 0 0 0
0x0a 73{adress(erc20Implementation)} push20 {adress(erc20Implementation)} 0 cds 0 0 0 0
0x1f 5a gas gas 0xbebe 0 cds 0 0 0 0
0x20 f4 delegatecall suc 0 0
0x21 3d returndatasize rds suc 0 0
0x22 3d returndatasize rds rds suc 0 0
0x23 93 swap4 0 rds suc 0 rds
0x24 80 dup1 0 0 rds suc 0 rds
0x25 3e returndatacopy suc 0 rds
0x26 602a push1 0x2a 0x2a suc 0 rds
0x28 57 jumpi 0 rds
0x29 fd revert
0x2a 5b jumpdest 0 rds
0x2b f3 return