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Bitcoin: Code: -26, Error: non-mandatory-script-verify-flag (Data push larger than necessary)” when trying to spend from P2WSH
I will provide you with an article about the error message you are experiencing when spending from a P2WSH (proof of work smart contract) address in Bitcoin.
Understanding Error Code: -26, Error: non-mandatory-script-verify-flag (Data push larger than necessary)”
When attempting to spend funds from a P2WSH smart contract address, you may see an error code that says “-26, Error: non-mandatory-script-verify-flag (Data push larger than necessary)”. This message can be frustrating, especially if it prevents you from completing the transaction. Let’s break down what each part of this error code means and why it occurs.
Script Verification
In Bitcoin, smart contracts run in a script format that includes functions such as spendFromAddress(), which is used to transfer funds from one address to another. These scripts must be verified by the blockchain to ensure they are valid and execute correctly.
`javascript
// Example of a P2WSH smart contract script:
function spendFromAddress(address, amount) {
//Function to verify transaction
}
spendFromAddress(P2WSH_ADDRESS, amount);
script-verify-flagMandatory script verification flag
is an option that specifies whether or not mandatory script verification should be performed. Mandatory script verification ensures that all functions called within a script must be defined and pass certain tests before the function can be executed.javascript// Example with mandatory script verification flag set
function spendFromAddress(address, amount) {
//Function to verify transaction (example)
}
if (!spendFromAddress(P2WSH_ADDRESS, amount)) {
throw new Error("Invalid transaction");
}
Data Send Size
When dealing with large amounts of data in Bitcoin transactions, especially when sending from a P2WSH contract, it is essential to check if the dataproperty is larger than necessary. This can lead to issues such as exceeding the maximum allowed size or encountering errors during transmission.
In most cases, "Data sent is larger than necessary" indicates that there may be a problem with the way you are constructing your transaction data, specifically with the amount being passed as a script data field ("amount"). When sending large amounts from P2WSH contracts, you may accidentally exceed the limit for such fields by passing values that are not formatted or populated correctly.
What is causing your problem?
Given this explanation, let's assume that the problem is with the transaction data. Specifically:
- You are trying to send funds from a 'P2WSH' contract address.
- The error message indicates issues with script verification (non-mandatory-script-verify-flag) and the size of the amount passed as a data field.
Solutions
To resolve this issue, make sure your transaction data is formatted correctly. Here are some steps you can take:
- Check data formats: Double-check how amounts are constructed within your P2WSH contract. Make sure they comply with Bitcoin's formatting rules for script data fields (amount
).
- Check script definition: Check if all functions called by thespendFromAddress` function in your P2WSH contract are defined correctly. Any missing or undefined functions will raise an error.
- Use a transaction tool: Use tools such as « Electrum », « Bitcoin Core », or specialized transaction builders to create transactions that verify their integrity before being sent.
- Validate input data: Verify that all input parameters, including the “amount” field, are formatted correctly and meet the requirements of your contract.
- Refer to P2WSH documentation: Refer back to the P2WSH smart contract documentation for specific requirements on how to construct script data fields or function calls within the contract.