Ethereum Transaction Error: Not required script Check the flag problem
As an Ethereum developer, you are probably facing an unexpected problem with your transactions. The error message “GOT 64: Non-Mandatary-Script-Verify-Flag (Subscription should be zero for verification failure (Multi Operation)” Indicates a problem with the script verification flag used in segwit transactions.
What is Segwit?
Segwit is a soft fork update introduced by Ethereum to improve transaction efficiency and safety. It allows more advanced script features such as portfolios with multiple signatures without requiring an additional block.
The error message explained
The error message suggests that the script check flag is defined as “non-mandatory” when checking the Multi-Synatuation Operation (Check (Multi) SIG). This implies that the transaction script has a conditional instruction (probably using IF or Switch) that requires a different signing to pass validation. However, in Segwit transactions, this condition should be met with a zero signature.
Possible causes of error
Several factors can contribute to this error:
- Incorrect script verification flag
: The script check flag can be defined incorrectly, leading to the "non -mandatory" problem.
- Script Conditional : Conditional instruction used in the script may not be coded or validated correctly, causing the error.
3.
Solution
To solve this error, make sure:
- The script verification flag is correctly defined
: Check that the script check flag is indeed "non-mandatory" (ietrue
) when checking the multi-signature operation.
- Conditional instructions are correctly encoded : Check twice that any conditional statements used in the script have proper coding and validation to ensure that they meet the necessary conditions for zero or different signatures.
- Subscription validation is correctly implemented : Check that signature check during the transaction shipping is implemented correctly, including checking signatures before proceeding.
Example of case use
To demonstrate a potential solution, consider an example of a simple conditional statement:
Solidity
Pragma solidity ^0.8,0;
Contract Example {
TESTCONDITIONAL FUNCTION () PUBLIC PERFORMABLE {
BOOL condition = TRUE; // Define a condition variable
if (condition) {
demand (msg.value> 10, “invalid value”);
} other {
Requires (false, “condition failed”);
}
}
}
`
In this example, the testconditional function uses an instructionif to test a condition. To correct the error, you would define the script verification flag as " True " (indicating that zero signatures are allowed), ensuring proper coding and validation of conditional instructions.
Conclusion
By sending segwit transactions, it is essential to review and carefully validate script checking and conditional statements to avoid unexpected errors like this. Following the best practices for scripts and signature verification, developers can ensure that their transactions are validated and performed properly on the Ethereum network.