is the metadata hashfield refer to the hash we created on asset creation? I’m not seeing it match to what I sent, is there a particular hash we should use?

The MetaDataHash field is optional and immutable at creation of the asset. It allows 32-bytes of arbitrary data storage. A common use is for an NFT creator to hash the source digital asset and include the resulting value into MetaDataHash field. This makes it very easy for someone else to validate …

Thanks Ryan, is there a particular hash algorithm to use for the 32byte? I’m just not seeing the values matching what I created to the info on explorer.

Currently there is no specification on what to write in this hash field. I guess most people would use SHA-256 or SHA-512/256 or Keccak-256.

Thanks! Let me give that a try.

@toad were you able to solve this? I’m adding a simple 32 byte hash in the Metadata, but upon creation it doesn’t match. I found this: algorandfoundation/specs/blob/master/dev/ledger.md#assets --- numbersections: true title: "Algorand Ledger State Machine Specification" date: \today …

Can you create the asset on TestNet (on a fake account), show the code you used, and show the creation transaction in a block explorer, so we can help you debug? The msgpack encoding is how the algod node process the metadata. You can completely ignore it. What you need to provide is exactly 32 by…

Hi @fabrice , The metadata was generated with hashlib.sha256() ‘7f3a1942999ccdcd0123e76c3b1a63d50cbf92e975f454ddc703e01fe4bd0213’ in bytes b’\x7f:\x19B\x99\x9c\xcd\xcd\x01#\xe7l;\x1ac\xd5\x0c\xbf\x92\xe9u\xf4T\xdd\xc7\x03\xe0\x1f\xe4\xbd\x02\x13’ Here is the asset created which is showing: “fzoZ…

So it’s working properly. The hash fzoZQpmczc0BI+dsOxpj1Qy/kul19FTdxwPgH+S9AhM= is in base64. When you convert it back to hexadecimal, you get your hash in hexadecimal. On macOS: $ echo -n "fzoZQpmczc0BI+dsOxpj1Qy/kul19FTdxwPgH+S9AhM=" | base64 -D | xxd -p -c 64 7f3a1942999ccdcd0123e76c3b1a63d50…

@fabrice Thank you very much for clarifying and for including the example.

Metadata hash fields

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Metadata hash fields

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