Bitcoin: Code: -26, Error: non-mandatory-script-verify-flag (Data push larger than necessary)” when trying to spend from P2WSH

I will provide an article about the error message you encounter when spending from a P2WSH (Proof of Work Smart Contract) address in Bitcoin.

Understanding the error code: -26, Error: non-mandatory-script-verify-flag (Data transfer greater than required)

When trying to spend funds from a P2WSH smart contract address, you may encounter an error code that says “-26, Error: non-mandatory-script-verify-flag (Send date greater than required)”. This message can be frustrating, especially if it prevents you from completing the transaction. Let’s take a look at what each part of this error code means and why it appears.

Script Verification

In Bitcoin, smart contracts are executed 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 that they are valid and executed correctly.

// Example of a P2WSH smart contract script:
function spendFromAddress(address, value) {
// Transaction verification function
}
spendFromAddress(P2WSH_ADDRESS, value);

Required script verification flag

script-verify-flag is an option that specifies whether or not 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 set
function spendFromAddress(address, value) {
// Transaction verification function (example)
}
if (!spendFromAddress(P2WSH_ADDRESS, value)) {
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 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, “Applying data larger than necessary” indicates that there may be an issue with how you are constructing the transaction data, specifically the value that is passed as a script data field (“value”). When sending large amounts from P2WSH contracts, you may accidentally exceed the limit of these fields by sending values ​​that are not formatted or not formatted correctly.

What is causing your problem?

Given this explanation, let’s assume that your problem is… related to the transaction data. More precisely:

– You are trying to send funds from a “P2WSH” contract address.

– The error message indicates issues with the 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 in your P2WSH contract. Make sure it follows Bitcoin’s format rules for script data fields (amount).

• Check script definition: Make sure all functions called by the spendFromAddress function are defined correctly in your P2WSH contract. Any missing or undefined functions will result in an error.

• Use a transaction tool:

  

  Use tools like Electrum, Bitcoin Core, or specialized transaction builders to create transactions that verify their integrity before they are 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 to the P2WSH smart contract documentation for specific requirements on how to construct script data fields or function calls within the contract.

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