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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How to build smart contract depending on trusted server for additional information
I am trying to build a smart contract that will need to rely on off-chain information from a trusted server in order to gather to the state of something which will impact on how the UTXO should be ...
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Failed to build atlas examples with cabal
I tried both in the main branch and in the atlas-0.3-update branch and get the same result. but when i run cabal build i get the same error fatal: Could not parse object '...
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Decompiling Plutus Core Binary Encoding
I'm working with Plutus Core smart contracts, and I have the binary encoding of a Plutus Core script. I'm curious to explore the higher-level Plutus code or any human-readable representation of the ...
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Is Plutus compiler backend producing code cheap enough for production purposes?
I have heard a couple of times, that is hard to make Plutus produce non-costly code, and one should consider writing scripts on a level with Plutarch's help instead. Still, I never get real reasons ...
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I want to mint an NFT using a JSON file using plu-ts, but I dont know how and where to start
I want to mint an NFT using a JSON file using plu-ts, but I don't know how and where to start.
Do I need to create a Node? OR Do I need to write it in Haskel? I have read and performed everything from ...
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Coming from ethereum I am looking for the Cardano equivalent of https://remix.ethereum.org/ for quick development
I am coming from the Ethereum world, where I got started with https://remix.ethereum.org/ really fast. What is the equivalant in the Cardano world so that I can experiment fast just using my web ...
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Create a smart contract in Marlowe from A to Z
What is the process of building a smart contract in Marlowe from start to deployment and first main net transaction? I know that there's blockly and Marlowe playground. But I can't figure out the step-...
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Programmatically write and submit a smart contract
Title. Any ways to accomplish this? Preferrably in react/javascript
Edit: downvote me to oblivion!!
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How to handle sensitive data in smart contracts?
I'm interested in creating an escrow smart contract using Plutus, where a seller stores an encryption key in the Datum and sells it for a price. The key should only be accessible to a buyer who pays ...
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Different types of Datums
I have a good understanding of the role of Datums in Cardano's Extended UTXO model, including their use in representing the state of a smart contract. However, I'm seeking further clarification on the ...
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which programming language is predominantly used for writing smart contracts in Cardano now?
I am a newbie to blockchain in the Cardano ecosystem. I have been exploring the Cardano documentation, which mentions various programming languages for writing smart contracts on the platform.
How do ...
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How to get Daily Volume for an Cardano token by using Cardano-Db-Syncs database
Is there an way to query directly Cardano Db Syncs database to get withhold of the daily volume of an certain token ( For example via using multi_asset.fingerprint )
WITH ma_tx_ids AS (
SELECT ...
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Can a smart contract execute itself automatically?
I was wondering wether a smart contract can execute automatically or not. For example, let's say I have a vesting contract that, when a certain deadline passes, automatically executes and send some ...
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Mutable NFT state by minting and burning in same transaction
The problem
Please consider the following case: a token (NFT) needs to holds some state, ie {a: 234, b: "someState"}, which needs to be mutable and it needs to abide to specific rules.
The ...
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Which would be the future language for writing smart-contract?
As we might know well-known approaches for writing smart contracts on Cardano are using Plutus Tx or Marlowe based on specific requirements. However, according to the growth of the Cardano community, ...
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playground-common package giving 'Failed to build scrypt-0.5.0' error
I'm trying to run my own little smart contract in the plutus-pioneer-program [fourth iteration] docker container and I'm having some problems. I've just added an extra folder alongside the other weeks....
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Unlock NFT from smart contract by Cardano-serialization-library
I am trying to implement the Unlocking of NFT from an "always true" smart contract. I am using the Cardano serialization library for this. I can lock the NFT successfully, but when i unlock ...
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how to use ownPubKey and RedeemerType and DatumType
My code is here.
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE ...
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Expecting one more argument to ‘RedeemerType’
My code is here
marketConstraints :: Market -> TxConstraints (RedeemerType -> ScriptContext -> Bool) (DatumType, ())
marketConstraints market = mustValidateIn (to $ scriptAddress market)
I ...
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PlutusTx TxInfo Type Mismatch
I am building a PlutusTx V1 Smart Contract for NFT Royalty distribution. Part of that requires totaling up the amount of Lovelace sent to the contract from the most recent tx. I came up with the ...
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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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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 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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