safeTransferFromfrom

SafeTransferFromfrom appears to be a typographical error or nonstandard variation of the widely used ERC-721 function safeTransferFrom. The standard function, safeTransferFrom, is part of the ERC-721 non-fungible token specification and is used to securely transfer a token from one address to another. The extra “from” is not part of the official API and is not defined by the ERC-721 standard.

Two overloads exist for safeTransferFrom:

- safeTransferFrom(address from, address to, uint256 tokenId)

- safeTransferFrom(address from, address to, uint256 tokenId, bytes data)

The first overload is typically implemented by calling the second with empty data. Both variants require that the caller is the owner of the token or is approved to transfer it, and that the from address is the actual owner.

How it works:

When transferring, safeTransferFrom validates that the token exists and that the caller is authorized. If the recipient address is a smart contract, the function calls onERC721Received on the recipient. The recipient contract must implement the IERC721Receiver interface and return a specific magic value; otherwise the transfer reverts. This mechanism guards against tokens being locked in contracts that cannot handle ERC-721 tokens.

Comparison with transferFrom:

transferFrom transfers the token but does not perform the onERC721Received check, which can result in tokens being lost if sent to non-compliant contracts. safeTransferFrom adds an additional safety layer by ensuring contract recipients can handle NFTs.

Usage and considerations:

safeTransferFrom is widely adopted by wallets, marketplaces, and other token-enabled applications. It is essential to ensure correct approvals and to be aware that contract recipients must implement the ERC721Receiver interface to accept tokens.