I will provide you with an article about the error message you are experiencing when spending money from a P2WSH (Proof of Work Smart Contract) address in Bitcoin.
Understanding the error code: -26, Error: non-mandatory-script-verify-flag (Data push larger than necessary)”
When trying to spend funds from a P2WSH smart contract address, you may encounter an error code that reads “-26, Error: non-mandatory-script-verify-flag (Data push larger than necessary)”. This message can be frustrating, especially if it prevents you from completing your transaction. Let’s take a closer look at what each part of this error code means and why it occurs.
Script Verification
In Bitcoin, smart contracts are executed in a script format that contains 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.
// Example of a P2WSH smart contract script:
function spendFromAddress(address, amount) {
// Function to verify transaction
}
spendFromAddress(P2WSH_ADDRESS, amount);
Mandatory script verification flag
script-verify-flag is an option that specifies whether to perform mandatory script verification. Mandatory script verification ensures that all functions called in a script must be defined and pass certain tests before the function can be executed.
// Example with mandatory script verification flag set
function spendFromAddress(address, amount) {
// Function verifying transaction (example)
}
if (!spendFromAddress(P2WSH_ADDRESS, amount)) {
throw new Error("Invalid transaction");
}
Data push size
When dealing with large amounts of data in Bitcoin transactions, especially when sending from a P2WSH contract, it is important to check whether the data property 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 push greater than necessary indicates that there may be a problem with the way the transaction data is constructed, specifically the amount passed as a script data field (amount). When sending large amounts from P2WSH contracts, you may inadvertently 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 your 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 that the transaction data is formatted correctly. Here are some steps you can take:
- Check data formats: Double-check how amounts are constructed within the P2WSH contract. Make sure they comply with Bitcoin formatting rules for script data fields (
amount).
- Check script definition: Check that all functions called by the
spendFromAddressfunction in the P2WSH contract define themselves correctly. Any missing or undefined functions will result in an error.
- Use a transaction tool: Use tools such as
Electrum,Bitcoin Coreor specialized transaction builders to create transactions that verify their integrity before sending.
- Validate input data: Verify that all input parameters, including the
amountfield, are formatted correctly and comply with the contract requirements.
- Check the P2WSH documentation: Refer to the P2WSH smart contract documentation for detailed requirements for creating script data fields or function calls in the contract.