I’m using ERC1155 based on ERC1155PresetMinterPauser. I Didn’t change anything from that implementation How does mint function actually uses “data” argument? is that mandatory?, if yes ,why? what that “data” actually represents? I see no references to that on mint function, or in _mint internal fu…

Hi @rtraba , To find more information about the _data parameter I suggest reading through the EIP: [image] EIP-1155: ERC-1155 Multi Token Standard Details on Ethereum Improvement Proposal 1155 (EIP-1155): ERC-1155 Multi Token Standard The issue comments are a g…

Hi @rtraba , The preset contract doesn't use the data parameter but passes it on. If you needed to pass additional data for mint and transfers then you could use data. EIP-1155 safeTransferFrom describes the data parameter as follows: Additional data with no specified format, MUST be sent unalte…

Thanks abcaoathup, so I see that basically _data parameter is just there to keep compliance with the standard most of all. Can you provide some insight about why the standard enforce this? I mean the reasons why. I understand that a any particular deployment could overwrite this method and do some…

What is actually the reason why the Preset-Contract ERC1155PresetMinterPauser does not use “_safeMint” instead of “_mint”? Shouldn’t we prefer the safeMint-methods over the conventional _mint-methods? And if not, what could be the reason for that?

_safeMint()? Do you mean the function in ERC721, you can find the defined of this function: function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual { xxx } And for _mint() in ERC1155PresetMinterPauser: function _mint(address account, uint256 id, uint256 amount, by…

Ah yes, my fault, sorry :slight_smile: I got the two standards mixed up.

ERC1155 data parameter on mint method

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ERC1155 data parameter on mint method

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