Questions tagged [metadata]

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Why NFTs on cardano use IPFS CIDv0 instead of recommended CIDv1

IPFS, nft.storage and most other ipfs providers default and recommend using CIDv1. In contrast, most recently (September 2022.) minted NFT's on cardano still use CIDv0: tarc citizen lagani r ...
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0 votes
2 answers
56 views

How can I create a token that shows 6 decimals places in Eternl?

I have created my own token and I have added a Cardano Token Registry specifying that the token has 6 decimals places. My entry looks exactly like the Minswap's token entry, but the difference is that,...
0 votes
1 answer
62 views

How would you implement Soulbound Tokens in Cardano?

A lot is going on at the moment in the Ethereum dev community with Soulbound Tokens: https://ethereum-magicians.org/t/eip-5114-soulbound-badges/9417 What would be the best approach for implementing ...
2 votes
0 answers
39 views

What's the best way to store encrypted data on-chain?

I need to store encrypted information in the metadata field of a transaction. Is there a best practice on this? Are there any projects already doing this? Which algorithms do they use for encryption?
2 votes
1 answer
46 views

Metadata '721' error on pool.pm

Hello and thank you beforehand for your time! I read a lot before posting and could not find a solution to this. Pool.pm is complaining about the metadata '721' throwing an error: "Expecting an ...
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1 vote
1 answer
17 views

Metadata and Mithril

From my understanding you need to run a full node to add metadata to a txn. Will it be possible to do this without a full node using Mithril?
1 vote
1 answer
25 views

How can I see if an UTxO holds an NFT in the postgres DB?

Is it possible to find out if an UTxO on the tx_out postgres table holds an NFT? OR in generell which kind of asset this UTxO holds? Thank you!
1 vote
1 answer
44 views

CNFT metadata structure

So I am working on a NFT minting and I checked the CIP-25 for metadata descriptions and I am confused regarding the naming of the NFT. What is really the name of the NFT? (as in recognized by JPG....
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1 answer
51 views

Problem with metadata on pool.pm

I am having some trouble with metadata for NFT I am minting. This is the asset on pool.pm: https://pool.pm/asset1q6fku9qrfld526pfdm746qu3j7wtgvuh5xet9u And again on adaptors.org: https://adapools.org/...
2 votes
1 answer
60 views

Plutus Script Validation Metadata

I have a question but I cannot find a concrete answer for that. I have a smart contract developed in Plutus for managing locking and withdraw of Tokens/NFTs. I'm wondering if I can validate some ...
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1 vote
2 answers
58 views

How can I allow users to update a public array of data based on whether they own a token or not?

I want to construct public lists that can be altered by people who own a specific token. Is there a way I can group data together into an array like structure and allow users to append to it? I ...
1 vote
1 answer
62 views

Metadata transactions / eUTOX TTL / locking up ADA

I'm following this guide on metadata transactions with the cardano wallet server. My goal is to prove the existence of a given IPFS hash at a certain point in time. I don't need to send or receive ADA ...
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2 answers
303 views

Is there a 'Cardano Naming Service' available?

Is there any services like ENS (Ethereum Naming Service) for Cardano available now? If no, how difficult it is to come up with one?
0 votes
2 answers
99 views

Submitting Transaction with CSL Metadata Isn't Showing

I've forked a dApp Connector I found on Github and I'm trying to add some transaction metadata to the ADA transaction it builds. This is what I currently have: buildSendADATransaction = async () => ...
0 votes
0 answers
15 views

Clarification on policy script serialization in offchain-metadata-tools and policyid computation

I am reimplementing parts of the token-metadata-creator CLI tools in Java and got a question or need for confirmation of my assumption regarding the serialization of policy scripts and computation of ...
0 votes
1 answer
87 views

Royalities CIP 27

I followed the CIP 27 for implementing royalities: https://cardanoupdates.com/commits/facb8aa0ad9aa41f1a047b2000674fdea2162e71 Mint no name token with the policy then burn it wit the metadata ...
2 votes
1 answer
86 views

Is Camel Case notation required for the Asset Name of an NFT?

Hello i just have noticed that i can mint NFTs with the Cardano serialization Lib with out using Camel Case notation: I can have string spaces as well a special characters. I have read in the CIP-25 ...
3 votes
2 answers
550 views

If metadata can be changed, how can the uniqueness of an NFT can be guaranteed?

Let's say, there's manufacturer that produces luxury watches, and he uses Cardano NFTs to track their authenticity. He embeds unique serial number of a watch into metadata of NFT. One watch - one NFT,...
1 vote
0 answers
61 views

Errors with compiling when trying to install offchain-metadata-tools

Hello I am trying to install the offchain-metadata-tools library from IOHK and when using nix-build -A project I am getting this error below saying failed in linker phase when trying to connect to the ...
0 votes
1 answer
58 views

How to be approved or reviewed on cardano-token-registry?

I made a pull request on cardano-token-registry but after days it's still blocked. How to ask for a review or some type of approval? My request is #1030 Andrea
3 votes
1 answer
513 views

What is the standard metadata schema for nfts

I realize that metadata for nfts has no official standard. However, many 3rd parties render nfts and their attributes which means they are reading meta data according to one or more schemas. Here is ...
0 votes
1 answer
731 views

Is posible to do Batch minting of NFT with each NFT having different image?

Since the metadata is attached to a Tx not to the NFT, and is unique per transaction, there can not be such a thing as a Batch minting of NFT with each one having different metadata for example "...
1 vote
1 answer
212 views

What is the difference between "on-chain-metadata" and "metadata" in the Blockfrost Endpoint

I am fetching my assets using the Blockfrost endpoint for a specific asset: https://docs.blockfrost.io/#tag/Cardano-Assets/paths/~1assets~1{asset}/get But there are two metadata entries, one for "...
4 votes
2 answers
218 views

How to retrieve the datum added with the option –tx-out-datum-embed-file from the tx witness data

I have been thinking recently about the way we are predominately creating NFTs on Cardano, right now the trend is to add the NFT attributes to the transaction metadata, however, I think this is not ...
0 votes
2 answers
236 views

How Do I include MP3/Mp4s into my smart contract?

How Do I include MP3/Mp4 capabilities in my smart contract? Im interested in minting songs and short videos as CNFTs but I do not see any information online what so ever about how this can be done. ...
5 votes
1 answer
915 views

How to mint multiple NFT assets in the same transaction?

The developer guide doesn't cover this. Here is an example of what I'm trying to do: https://cardanoscan.io/transaction/e1c7bc707e56bf37b4325dc4b7fe524eafe8ca746e54746d60b321588ffebb6c?tab=tokenmint I ...
0 votes
0 answers
59 views

Cardano Wallet AP Adding Meta Data to transaction Using C#

I am trying to add meta data in transaction using Cardano Wallet API from C# program. But i am not able to model Json format for meta data to equivalent C# class model and due to this i am getting bad ...
2 votes
1 answer
81 views

Store data in Tx Metadata on Cardano

I would like to notarize some data (like document signatures for example) of less than 500KB on the blockchain and for that I thought to use the Metadata field of a transaction. So I have 2 questions: ...
2 votes
1 answer
269 views

Is really any token metadata stored on chain? Or is it the mint TX metadata?

I am aware that offchain metadata is stored using the registration as Cardano Developers portal dictates, my concern is about on-chain metadata. Is really any NFT-metadata stored on-chain? Like ...
0 votes
1 answer
168 views

How do I mint an NFT without any image and and just some text?

I have made a script here to mint NFT as per the official docs. : https://github.com/nateshmbhat/cardano-nft-minter But there is no mention in the doc to mint an nft with just some text description ...
2 votes
1 answer
399 views

Extracting metadata info of cardano tokens

I am currently working with cardano-db-sync and I am doing research to extract the metadata of all the native tokens. I found out the policy id and asset name can be extracted from cardano-db-sync but ...
6 votes
2 answers
1k views

What is the size limit of transaction's metadata?

Is there a size limit on transaction metadata? If there is a limit, is it varying or fixed size?
2 votes
1 answer
52 views

Cardano Data for Data Analytics and Data Visualisation

Where can I get Cardano raw data or formatted data (e.g. no. of wallets, ADA price, etc) that I can use for data science, analytics and visualisation?
0 votes
1 answer
67 views

Cardan Hobby Project - Concept question

As hobby, I am trying to build a small website (using cardano db and nextjs) that would work as described : The website displays on its front page a "message" . The "message" is ...
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5 votes
2 answers
542 views

Retrieve NFT transaction metadata

i've minted some NFTs with 721 metadata in the transaction and am now looking to retrieve the metadata information for further processing. I've send these NFTs around a bit so the utxo is not the ...
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6 votes
1 answer
469 views

Options for adding Metadata to NFTs, to be used in a Plutus validator

I have a use case where I want to issue NFTs to users along with metadata (in the general sense of the term). The point of these NFTs is literally to hold that metadata - the user's results from ...
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5 votes
1 answer
443 views

Metadata value limits (64 UTF bytes) - Use Arrays ? NFT image question

I'm currently setting up my minting software and noticed I get the error when assigning a CIDv1 hash as the image (CIDv0 works fine - it just fits)"Text string metadata value must consist of at ...
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1 vote
2 answers
131 views

How to permanently persist an arbitrary hash string in the blockchain?

I have an interesting use case for permanently storing an arbitrary hash string somewhere "reliable" publicly and, very important, with a trustworthy timestamp. For me, this sounds like a ...
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15 votes
2 answers
309 views

Append metadata to transaction from Plutus code

Is there a way to append metadata to transactions that are send from plutus code? Right now we send transactions from the contracts like follows (or something alike): ledgerTx <- ...
8 votes
2 answers
1k views

NFT Image not Displaying in Pool.pm after using the 721 Metadata Standard

I am not seeing the image of the NFT I minted a couple of hours ago on pool.pm. I used the standard recommended by Alessandro Konrad and Smaug in https://github.com/Berry-Pool/CIPs/blob/master/CIP-...
5 votes
1 answer
78 views

Is the metadata limit on testnet transactions the same as mainnet?

I was wondering if there was a difference in the byte limit in metadata added to test-net transactions versus being done on the main-net.
1 vote
0 answers
96 views

What's happened with Cardano Proof of University Diplomas in Greece? [closed]

Storing university diplomas was a novel major usability announcement for Cardano back in 2018. It's been over 3 years if my memory serves me right. The plan was to use an enterprise permissioned ...
7 votes
1 answer
390 views

How can token metadata be stored onchain?

I was wondering how to link additional (meta)data to a token. Consider a trading card game which allows a user to purchase a booster pack containing cards via smart contract. Those cards should have a ...
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4 votes
2 answers
176 views

Can the value of the NFTs be added to the stake size of the pool?

Many small stake pools struggle with increasing their stake. The stake could be increased by adding the value of all the NFTS held in wallets by both delegators and operators. How do we determine ...
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6 votes
2 answers
192 views

How can I make an item traceable on the Cardano blockchain?

We would like to be able to identify an item on the blockchain for traceability and assign specific transactions against it to maintain a chain of custody. Can anyone lead me in the direction I need ...
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7 votes
2 answers
221 views

Providing metadata to `cardano-cli transaction build-raw`

What command-line options and input file content can I provide to cardano-cli transaction build-raw to specify a transaction with metadata similar to the one in this transaction? https://explorer....
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11 votes
1 answer
172 views

What enables the Cardano blockchain to be capable of storing so much information?

After the Africa Special it was announced that DIDs and academic records of 5 million+ people will now be stored in the Cardano blockchain and this is set up to scale for massive adoption. Thus it ...
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