I followed the CIP 27 for implementing royalities:


Mint no name token with the policy then burn it wit the metadata incluiding royalities info:

for example:


   addr: [
       rate: "0.1"

then I burn the token.

My doubt is if should I add the same data that I added in the initial mint/burn as a field in the standard 721 metadata? so the marketplace can fetch this field, or if it is not needed, i am guessing it should not be needed otherwise the initial mint/burn mechanism would be not needed, right?

1 Answer 1


No, don't add your 721 data here. The above example is all you should have, and then burn the token.

  • Thank you, may I ask how do you know this is the right way to do it? Feb 22, 2022 at 19:59
  • 1
    Because I run Cardano minting vending machines for artists and have done it dozens of times.. :) I've also spoken with the person who initially wrote the 777 CIP proposal. You can find the details here: github.com/cardano-foundation/CIPs/pull/116/files
    – Tygar Pool
    Feb 23, 2022 at 12:29

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