Questions tagged [metadata]

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11
votes
1answer
108 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 ...
11
votes
2answers
199 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
2answers
788 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-...
7
votes
2answers
159 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....
7
votes
1answer
294 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 ...
6
votes
2answers
183 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 ...
5
votes
2answers
439 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?
5
votes
2answers
221 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 ...
5
votes
1answer
66 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.
5
votes
1answer
270 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 ...
4
votes
2answers
147 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 ...
4
votes
1answer
274 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 ...
3
votes
1answer
210 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 ...
2
votes
1answer
174 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 ...
2
votes
1answer
123 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 ...
2
votes
1answer
49 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
1answer
80 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 ...
2
votes
1answer
117 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 ...
1
vote
2answers
102 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 ...
1
vote
1answer
74 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 "...
1
vote
0answers
23 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?
1
vote
0answers
93 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 ...
0
votes
1answer
158 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 "...
0
votes
2answers
66 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. ...
0
votes
1answer
75 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 ...
0
votes
1answer
60 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 ...
0
votes
1answer
38 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
0
votes
0answers
29 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 ...