15
votes
Accepted
What is a Redeemer?
From https://iohk.io/en/blog/posts/2021/04/13/plutus-what-you-need-to-know/:
When validating an address, the script will access the data being
carried by the output, the transaction being validated, ...
- 1,527
11
votes
What is a Redeemer?
In simple terms, redeemer is the data that the user of the smart contract provides to the smart contract.
In the simple UTxO model, redeemer is your signature. By providing your signature, you prove ...
- 586
6
votes
What is a Redeemer?
Before (E)UTxO - There Was UTxO
Understanding how a UTxO model works (such as BTC) may help you understand the implementation of (E)UTxO in Cardano.
The UTxO Model
A UTxO model, meaning: unspent ...
- 211
5
votes
Accepted
Plutus datum and redeemer on cardano-cli
Have a look at the following source Cardano-Api Haddock. Here you will find all about the conversion between Haskell data types and the Json format the cardano-cli uses.
I noticed that you used the ...
- 1,872
3
votes
Accepted
Decoding transaction redeemers to JSON
A hash is the product of a one way function. It is not possible to decode the redeemer hash.
The redeemer itself is stored onchain inside the witness set of the transaction, see cddl spec (rfc8610). ...
- 1,560
3
votes
Accepted
What is the mkValidator Script
A validator script locks transaction outputs. This function is where you define conditions to unlock them. https://plutus.readthedocs.io/en/latest/tutorials/basic-validators.html
- 1,560
3
votes
What is the mkValidator Script
On Cardano logic can be enforced on how UTxO's are spend by attaching a "script" to the transaction + some inputs that will be used to run the script (the datum, redeemer and context). ...
- 1,872
3
votes
Plutus datum and redeemer on cardano-cli
{
"constructor": 0,
"fields": {int: 42}
}
This isn't valid because fields must be an array. The index of the constructor and fields will match the order of types defined for the ...
- 1,560
3
votes
Is Redeemer similar to <ScriptSig> in bitcoin context?
One way to think of it is that:
The Datum is a piece of data that's attached to the UTXO by the producer,
The Redeemer is a piece of data that's provided by the consumer,
When the UTXO is consumed, ...
- 224
2
votes
What is where executed and when?
One detail to add here:
In short:
if another Tx generator wants to use the same script, but one or more blocks later, it will need the datum (previous state of the script), which must be exposed by ...
- 101
2
votes
Is it possible to consume a script UTxO in the same block?
If the first output is in the mempool, you can use it in a subsequent transaction without the node throwing an error. However, there is no assurance that both transactions will be part of the same ...
- 176
2
votes
Meaning of Index of Redeemer in Serialization Lib 10.4
I was digging in this topic because I struggled with some transactions. I was reading the CDLL, the serialization lib, docs, etc.. but I couldn't find anything about the meaning of this index.
After ...
- 21
1
vote
Error Applying Redeemer Lucid
You probably already did, but check that you are actually passing the utxos to the tx, and check that the datum is the right one, the datum seems to be hash or its just a bytestring? how does quering ...
1
vote
Accepted
blockfrost.io API, reference inputs and redeemer tx_index
AIUI, when using the blockfrost.io API, the tx_index field in a redeemer contains the index of the enclosing transaction's input that it consumes (is that true ?).
The index holds different meaning ...
- 322
1
vote
Can one see Redeemer value on Blockchain?
The redeemer is stored in the transaction, so is visible onchain.
CardanoScan.io is one example of a blockchain explorer that displays the redeemer value for transactions that execute a plutus script (...
- 1,560
1
vote
Accepted
Script Execution Failure PT8
See here, PT8 means PlutusTx.List.head: empty list
Perhaps it's because you're using head on an empty txInfoSignatories. You must use --required-signer or --required-signer-hash flags when building ...
- 1,560
1
vote
What is where executed and when?
The blockchain does not only store hashes. It also stores the datum and the script of spent UTxOs. It would otherwise not be possible to validate the transaction in retrospect. So while you don't need ...
- 1,521
1
vote
Auction example: How does Bob know the redeemer of the UTXO sitting at the script address?
Finding transactions
Bob (the person) doesn't have to necessarily know that there's an auction going in the blockchain, but he can launch a transaction and look for UTXOs of this type of contract. If ...
- 119
1
vote
Can all redeemers in a transaction be retrieved at once?
This was Lars response to this question in the ppp Q&A on 25/Jan/22. Recording timestamp 0:43:17
You cant retrieve all redeemers at once, You can only see your own
redeemer,
You are always in ...
- 343
1
vote
Does the redeemer have to be from a wallet address/contract?
You seem to be misunderstanding how smart contracts work on Cardano.
Does the redeemer have to be from a wallet address(?)
Redeemers don't come from wallet address, they are included on transactions....
- 3,247
1
vote
How does the final transaction in the auction example know who did the bid?
Each change in state in the auction contract passes a new datum (arbitrary data). The auction datum is made up of the 'Auction' and 'Bid' records. The bid record has a 'bBidder' field which is the ...
- 31
1
vote
Finding the redeemer of another UTxO in a transaction
if I got you right, what you want to do is not possible.
The spending transaction sends the reedemer for each UTXO the transaction wants to spend.
The spending transaction is created by your offline ...
- 66
1
vote
What is a Redeemer?
There is an interesting example in one of the Pioneer lectures which implements Uniswap on Cardano.
A redeemer is not only used to justify that a UTxO can be spent, but also the manner in which it ...
- 524
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