Questions tagged [datum]
The datum tag has no usage guidance.
16
questions
1
vote
1answer
41 views
How does Constraints.mustHashDatum work?
I'm trying to understand how Constraints.mustHashDatum works but I'm not able to figure out the purpose of this Constraint.
Any help would be great.
8
votes
2answers
87 views
Plutus pattern/technique for finding original datum preimage of TxOutDatumHash?
Every UTXO at a script address must have a TxOutDatumHash (or will be unspendable). To spend the UTXO at the validator you provide a datum and a redeemer, the script must validate with your redeemer, ...
0
votes
1answer
27 views
Is Redeemer similar to <ScriptSig> in bitcoin context?
In the (e)UTxO model, discussed in the 1st lecture of PPP#3, I am trying to understand the differences between the UTxO model of Bitcoin and the (e)UTxO model of Cardano.
From what I understand, the &...
0
votes
1answer
50 views
How does the final transaction in the auction example know who did the bid?
In the second transaction of the auction example, these are the output EUTxO's. In the final transaction, only wallet 1 and the script are inputs. How does the script know that wallet 3 has done the ...
0
votes
3answers
61 views
How to pass TxOutDatumNone when building a script transaction with cardano-cli
I'm trying to consume a UTxO from a script address. When querying the script address with cardano-cli query utxo, I have the following UTxO:
TxHash ...
1
vote
1answer
44 views
How to add datum to UTXO in nami
Datum is hashed and assigned to an UTXO
When you send the transaction you can add optional parameters like metadata and/or datum
datum is used by smart contract since it's the only data that smart ...
0
votes
1answer
30 views
Embedding address into the datum using the CLI
I have a validator that uses Address in datum. I also have an address generated (payment.vkey, payment.skey, payment.addr, stake.vkey, stake.skey, stake.addr). I'm able to get PubKeyHash using command ...
7
votes
2answers
133 views
Is there complete cardano-cli documentation?
Hello all I can find is the cardano-cli help and
https://github.com/input-output-hk/cardano-node/blob/master/doc/reference/cardano-node-cli-reference.md/
I am trying to get information on things like ...
4
votes
2answers
82 views
How do I read the datum of an output?
How do I get the datum of an output from cardano-graphql (or another service)? I have attached it using the --tx-out-datum-embed-file flag already when building the tx using cardano-cli.
Thanks!
3
votes
1answer
91 views
Where is the Datum stored in PAB?
In utxo we store only the hash of the datum, so whenever you work with the Cardano cli to run a transaction - you should provide datum or its hash via tx-out-datum-embed-file, tx-in-datum-file, etc.
...
1
vote
1answer
82 views
Ensuring NFT collection uniqueness using counter as asset name?
I would like to be able to mint a collection of NFTs across different transactions that fall under the same policy id.
A method I would like to try is making a 'dummy' nft that holds a counter as its ...
5
votes
2answers
106 views
How can I enforce a datum type to be correct?
Most types in Plutus are simply wrappers around BuiltinByteString. For instance the bytes in PubKeyHash are not serialized/deserialized to an actual pubkey hash and checked for correctness. So ...
2
votes
0answers
45 views
How can I secure a Datum value in a smart contract?
I am trying to figure out how to write a script where you can make sure the datum value doesn't change each time an output gets consumed. For example, in the auction script in the pioneer program each ...
2
votes
2answers
110 views
How does custom Plutus data type map to cardano-cli --tx-in-datum-file content?
Let's say I have validator, which checks datum against two numbers, hash, time and a string and there are some funds locked at this script address and I would like to unlock these funds using cardano-...
2
votes
1answer
87 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
1answer
135 views
How to specify the new output datum value (not hash) using the CLI
I have written a script that basically keeps a counter and every time it is spent increases said counter, the way it guarantees that the counter was increased is by checking the current datum of the ...