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could the metadata inn ERC721 be altered after issuing a token ? I want to create an contract allowing people changing the Token metadata content (on the tokens purchased in ICO).

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  • if you are asking about technical possibility , then yes, you are the one who is programming the contract, so you can output from a metadata call even a pseudo-random number. btw, metadata is optional, not a requirement.
    – Nulik
    Commented Jun 28, 2018 at 23:25
  • I am treating metadata as added value, just trying to determine whether I can overwrite it. Do you have an idea what is the metadata weight limitation in erc721 ?
    – frkfrk0
    Commented Jun 29, 2018 at 9:06
  • Haven't seen any size limitations in the standard specification of 721. But I am not fully understanding what are you trying to achieve. Maybe its worth detailing this in the original question. Because 721 tokens are non-fungible, i.e. each token is unique and has different price. However the ICOs are offering fungible tokens (like EOS token for example) , these tokens have the same price for the entrie totalSupply. So I guess your idea of offering metadata on purchased tokens in an ICO is conceptually flawed.
    – Nulik
    Commented Jun 29, 2018 at 20:27
  • I am thinking if I am able to alter the metadata, after deploying the contract.
    – frkfrk0
    Commented Jul 6, 2018 at 8:54
  • I am trying to make an example for you but Remix IDE is broken at the moment. Please ping me if this is fixed // github.com/ethereum/remix-ide/issues/1531#issue-361785565
    – William Entriken
    Commented Sep 19, 2018 at 14:52

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Metadata of a non-fungible ERC-721 token are hosted on a public HTTP address. The content of this metadata JSON file can be changed. ERC-721 standard does not prevent you to add smart contract logic for changing token's URI.

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