Bitcoin: Broadcast Error RPC error: {“code”:-26,”message”:”non-mandatory-script-verify-flag (Invalid Schnorr signature)”}

Bitcoin Blockchain Error: Invalid Schnorr Signature in Broadcast RPC

The Bitcoin blockchain is experiencing issues with Broadcast RPC, a critical feature that allows nodes to broadcast raw transactions to the network. The latest error message from the Bitcoin Core client indicates a problem with the Schnorr signature verification process.

Error Details

The error message provided by the Bitcoin Core client states:

Broadcast Error: {"code":-26,"message":"non-mandatory-script-verify-flag (invalid Schnorr signature)"}

This code indicates that an invalid Schnorr signature is being used in the broadcast process. The “message” field lists the error reason as “non-mandatory-script-verify-flag”.

Introducing Schnorr Signature

For those unfamiliar with the Schnorr signature scheme, it is a secure digital signature scheme developed by Nick Wise and Simon De Courcey. It uses a compact representation of the public key to represent private keys.

The Bitcoin payment script uses the Schnorr signature scheme, which allows nodes to verify transactions without storing the entire blockchain history. However, this process relies on the transaction having a “script verification” flag set, and verifying this flag during delivery can cause errors if it is not implemented properly.

Causes of the error

The error message indicates an issue with the “non-mandatory-script-verify-flag” flag. This flag is used by nodes to verify that the script associated with a transaction has been executed. If this flag is set but the Schnorr signature is invalid, errors may occur during streaming.

In most cases, this type of error would be resolved if the node could correct the signature or re-execute the transaction from a previous block that was successfully verified. However, in some cases, an incorrect or outdated client installation can cause such errors.

Solution

To resolve the issue, you can try the following steps:

• Check your transaction history: Make sure you have not executed any transactions from the last block that may still have the “non-mandatory-script-verify-flag” set. Try re-executing these transactions and verifying their signatures before releasing them.

• Update your client configuration

  

  : Check for any updates that address known issues or bugs in the Bitcoin Core client installation.

Conclusion

The Bitcoin Core client error message indicates a problem with the Schnorr signature verification process during streaming. To resolve this issue, it is necessary to identify and resolve the root cause of the error, which may include reviewing transaction history, updating the client configuration, or seeking help from the Bitcoin community.

By understanding the root cause of the error and implementing fixes, you can ensure a smoother Broadcast RPC experience and overall functionality of the Bitcoin blockchain.

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