I was wondering how it is possible to actually validate if a certain Token is an NFT without having to inspect the code of the script which mints that Token? Only by checking if the current quantity is 1 will certainly not ensure that it won't be possible to mint more of that Token.

1 Answer 1


You can check the token policy for that. For most NFT projects you can look it up on https://pool.pm

A token policy can look like this:

  "scripts": [
      "keyHash": "66833acfcf26d87e56bc829aa7bcef13295d4eee4d8b442175bd67a9",
      "type": "sig"
      "slot": 31882046,
      "type": "before"
  "type": "all"

You can see the "slot": 31882046 and "type": "before" values which means tokens with this policy can only be minted before slot 31882046. To be sure that your NFT is unique, you can check that the quantity is 1 and the current slot of the blockchain is later than the one mentioned in the policy.

This policy is from the following NFT: https://pool.pm/1131301ad4b3cb7deaddbc8f03f77189082a5738c0167e1772233097.CardanoBits1947

  • How do you check the quantity? Commented Aug 4, 2021 at 15:58
  • 1
    You can see the quantity on pool.pm on the asset or on cardanoscan.io when searching for the policy id. These are just 2 of many options.
    – eddex
    Commented Aug 4, 2021 at 16:31
  • How to check quantity using CLI? :)
    – sloik
    Commented Aug 15, 2021 at 17:08
  • Hi @sloik, I'd recommend you create a new question for this.
    – eddex
    Commented Aug 16, 2021 at 5:33
  • @eddex cardano.stackexchange.com/questions/2348/… done :)
    – sloik
    Commented Aug 16, 2021 at 15:26

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