Questions tagged [smart-contract]
A digital agreement that specifies where funds/tokens/assets should go, and under what conditions they will be sent, executing a deal only when all the conditions are met.
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Limit the number for each Token (AssetName) within one Currency Symbol (Policy ID)
is there any way to limit number for each tokens within one minting policy, in Plutus validator?
For example for policy ab12 I want to allow users minting tokens, in different transactions. Сan the ...
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Can I view a Plutus smart contract on the NFT marketplace?
Can I view a Plutus smart contract of an NFT from the marketplace like (JPG store) and what is PubKeyHash ?
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Comparing VALUES in a smart contract. How to know if they will be normalized or not?
I need to make VALUES comparisons on chain.
I realized that if a use the (==) operator from Plutus it is very inefficient in matter of memory and cpu steps needed to compute.
(https://github.com/input-...
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Need to Retrieve Info from (NFT)Assets in Policy ID to see if they are in a Plutus Contract (smart contract) or Not using Blockfrost API
I have a python script that retrieves the NFT asset name, and addresses of a specific policy ID using blockfrost API. Now I need to amend the script to add to the csv whether or not the specific asset ...
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"Transaction submit error" while trying to unlock funds from script address using Mesh
This is my setup code.
const wallet = await BrowserWallet.enable('Nami');
// this script always succeeds regardless of the datum or redeemer
const script: PlutusScript = {
code: '59079559079201......
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"The second data argument, does not decode to a context" when minting NFT with Mesh
This my script for minting NFT:
{-# INLINABLE mkPolicy #-}
mkPolicy :: BuiltinData -> PlutusV2.ScriptContext -> Bool
mkPolicy _ ctx = traceIfFalse "wrong amount minted" checkNFTAmount
...
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How to resolve this "(FromAlonzoUtxoFail (UtxosFailure (ValidationTagMismatch (IsValid True)" transaction submission error on mesh library
I am getting this error on transaction submission.
""transaction submit error ShelleyTxValidationError ShelleyBasedEraBabbage (ApplyTxError [UtxowFailure (UtxoFailure (FromAlonzoUtxoFail (...
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How do I design a dApp for 1000 NFTs minted per second
I am brainstorming on the architecture of a Cardano dApp that will be able to issue tickets as NFTs and can scale to around 1000 NFT tickets per second. From what I understand so far on UTXO, a ...
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How to generate CBOR hex of plutus smart contract
How can i generate the CBOR hex of a plutus smart contract. Does it requires to generate CBOR of onchain code only or both onchain and offchain?
Also if have a smart contract which requires parameters ...
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How to deploy the Plutus smart contract
I am following Plutus-pioneer-program to learn smart contract development in Cardano. I have tried the onchain and offchain code, compiled and tested in Plutus playground and also in emulator trace. ...
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Understanding Script Failure Error Relating to Order TxIds - (script hash not known)
trying to claim back the first player bet after deadline in the ZeroOneGame from ppbl gimbalabs course on pre-production_testnet I get an error when trying to build the claim transaction.
I have this ...
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What prevents a smart contract from going into an infinite loop?
What is the equivalent of gas in preventing DoS attacks? What happens if an attacker writes a recursion that never stops in Plutus? Someone asked the question before.
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Possible to get the total supply of a native token in a smart contract?
Is it possible to get the total supply of a native token in a smart contract, similar to the following Solidity code from here? One can easily query it from an external API.
address token = ...
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Is validator script needed to spend a UTXO locked by its hash?
When a UTXO is produced, it is locked to an address, i.e., the hash of a script, not the script itself. When a transaction spends it, does the tx have to provide the script in its input? There are ...
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ownPaymentPubKeyHash == wallet address?
According to this documentation, ownPaymentPubKeyHash is:
Get the hash of a public key belonging to the wallet that runs this contract. * Any funds paid to this public key hash will be treated as the ...
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How to decode the datum stored across records in the tx_metadata table for a given tx
For a given tx - where a contract has been used, outputs have been stored in the tx_metadata table - in this case key/value pairs where the values of keys 0 through 10, when appended together to form ...
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Mesh Error: getUsedCollateral not implemented
I'm using mesh and follow this example of always-succeed smartcontract.
I successfully send Lovelace to the script address. But when building transaction for redeeming Lovelace from the script address,...
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How can i store local variables in Plutus just like solidity?
As the title suggests, how do i store local variables in Plutus? In solidity, i can have a (address => bool) mapping to enforce a rule that some functions should be callable at most ONCE by a ...
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How can I interact with smart contract created from Marlowe in the testnet/mainnet?
I create a smart contract with Marlowe from https://play.marlowe-finance.io
I now want to deploy the contract in the preview testnet and later mainnet. I imagine it must be somehow converted into ...
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How to import Plutus.Contracts.Currency
I am trying to build an application that will make use of function mintContract under Plutus.Contracts.Currency, but i have difficulty importing this module. What can i do?
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Call Martify Smart contract by cardano-cli
I call the martify smart contract by cardano-cli but I've seen the error Command failed: transaction build Error: The following scripts have execution failures:
the script for transaction input 1 (in ...
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Decentralized Private Content Storage and Accessing
What would be the best way to store Private Video on chain, completely and only NFT holders should be able to access it
Like the video can be encrypted and stored on IPFS or STORG. Only the NFT holder ...
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How To Verify The Code Of A SmartContract?
There's a lot of talk about open-source code on Cardano, but how can I verify that the SmartContract(s) in a git repo are the actual SmartContracts the project has deployed to the Blockchain?
I want ...
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How to properly start a new Plutus project, from scratch
I'm from ETH's ecosystem and recently just decided to get into Cardano development, specifically Plutus dev work thanks to Demeter.Run, and after going through the Plutus starters on there, I noticed ...
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How do you interact with smartcontract on jpg.store
Does anyone know how you interact with smart contract on jpg. store
Do we need this?
https://github.com/jpg-store/current-jpg-store-contracts
if so how do we do so?
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How do users interact with smart contract?
In plutus playground, there is an example called “Vesting”. In the simulation, users can interact with this smart contract by click on “vest fund” or “retrieve funds”.
Now suppose that we compile this ...
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Printing a plutus validators cborhex to a file
I was hoping to get some advice re printing a plutus validators cborhex to a file. Im kinda basing my logic off of an example in week03 in the pioneer program but need to make some adaptations.
Below ...
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Use a parameterized currencySymbol within a Plutus Validator. Unsupported feature: Type constructor: GHC.Prim.ByteArray#
I have a minting policy which is parameterized by PaymentPubKeyHash and a script which checks that a token from that minting policy has been burned. The script also takes PaymentPubKeyHash as a ...
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Plutus Playground - mustPayToTheScript - unexpected char escapes - 0 converted to \NUL, 1 to \SOH
I am having trouble with the mustPayToTheScript function - I am getting this error
Contract instance stopped with error: "WalletError (InsufficientFunds \"Total: Value (Map [(,Map [(\\\"...
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Plutus Playground WalletError: InsufficientFunds
I am running my smart contract on the plutus-playground and getting the error below:
Contract instance stopped with error: "WalletError (InsufficientFunds \"Total: Value (Map [(,Map [(\\\&...
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Plutus playground error when running simulator: WalletContractError ToCardanoError (Tag \"toCardanoPolicyId\" (Tag \"1 bytes\" DeserialisationError))
Plutus-apps v2022-04-06
My smart contract compiles successfully however when i run the simulator i get this error
Contract instance stopped with error: "WalletContractError (ToCardanoError (Tag \&...
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Convert ChainIndexTxOut to TxOutTx
I have this function that is expecting type TxOutTx, but it receives ChainIndexTxOut. I'm trying to convert to the type required but encountering issues
getTradeDatum o = case txOutDatum (txOutTxOut o)...
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Is there an equivalent of Bitcoin Script Opcodes or the EVM instruction set in Cardano
Is there some lower level code that Plutus code compiles to (akin to Solidity => EVM bytecode, or BSV sCrypt => OP_codes)?
Related (but distinct) how the state changes: https://cardano....
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How can I determine which smart contracts / script addresses are associated with which dApps?
I have seen numerous examples of blockchain explorers providing information about the on chain activity of specific dApps. For example:
opencnft.io aggregates data about various token marketplaces
...
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Smart contract is not working after Vasil Hardfork in testnet
My smart contracts deployed in testnet stoped working after the Vasil Hardfork. i get this error:
""transaction submit error ShelleyTxValidationError
ShelleyBasedEraBabbage (ApplyTxError [...
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Can I Use TraceIfFalse in deployment?
So I use traceIfFalse to test a lot of my smart contracts now I'm ready to deploy some of then and I want to know if this is for development only or if its fine to have a smart contract use this ...
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How to have a contract on chain for extended periods of time?
In PPP Larz explains that there's a limit to how long a contract can remain on chain, what is that limit and how do I go about extending it?
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What is a Semantics Model?
In the eUTxO research paper by IOHK, it mentioned that the eUTxO model is able to enable both expressive smart contracts and keep the simple semantic simplicity of the UTXO model.
But what does ...
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How to convert Address type variable to get "addr_testXXX" format address?
In plutus endpoint, I want to convert Address type value to get addr_testXXX format address.
I have try :
import Cardano.Api ( SerialiseAddress (deserialiseAddress, serialiseAddress) )
...
-- here, ...
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How To Convert Old Plutus Scripts to Vasil Reference Scripts?
One of the fun things, the Vasil hardfork gives us is the ability to reduce the size of transactions and so put more of them into a block (speeding up the chain).
My question is how to change the ...
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How to create an unspent UTXO with specific value
I want to create a script (smart-contract) utxo with a specific number of tokens (it can be an output of a transaction before) in cardano-serialization-lib - javascript. I need this utxo to be part of ...
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Is there a way to see which Plutus code is deployed on a specific script address?
On Ethereum, for example, there is a way to see the Solidity code that is deployed in a specific address (as long as the code gets verified).
Is there a way to achieve this same behaviour in Cardano?
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How to Securely Serialise a Plutus Smart Contract Endpoint?
Assuming I made an arbitrary smart contract and want to serialise the endpoint after I have the validator hash and address hash, what should I do to ensure that the serialisation is as safe as ...
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Is possible to create a cNFT that depends on 'proof of ownership' in order to be own by a wallet?
I'm thinking on a way to create a cNFT that requires 'proof of ownership' to be minted and own by a wallet, by proof of ownership I refer to something the receipt owns and can pass to others or loss, ...
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How can I check the origin of a Token?
A smart contract minted a Token and send it to my wallet, after a time has passed how can I check if that smart-contract in specific did mint the token?
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Where Do I Go To Find All The ScriptContexts Feilds and Functions?
Hi im getting lost in the documentation, I have found some things I was looking for but am failing to find the info and functions for script contents. Im using this link https://playground.plutus....
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Whats the function to get the current time in Plutus?
Im using the time module in the ledger class to do some custom validation logic, but everything is done as intervals and I cant find the function that gets the current time. What is it?
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How to securely call Blockfrost or other API service from Smart Contract?
I just spent a few days trying to find a way to access account data from a smart contract using only plutus. Turns out IOG has yet to put that functionality in (at least that's how I understand it) ...
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How to get transaction info of a public key hash in a plutus smart contract?
Given a PubKeyHash (pkh) how can I get the history of that pkh's transactions from within a plutus smart contract?
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How To Get Address Transaction history into Smart Contract?
If I want the smart contract to alter functionality depending of the history of the signing address, how do I access the history from within the smart contract?
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