Bitcoin: Is my k nonce being re-used here?

I can help you investigate wheour your private key (also painting as a nce) is reused.

Bitcoin SignMessage Output Explanation

When you run /bitcoin-cli signmessage "p2ph-address-here"




$ ./bitcoin-cli signmessage "p2ph-address-her" "abc123"

   > Bitcoin: transaction signature

  +--------------------------+++

  | Signature (base64) |

  +--------------------------+++



The first line shows that a new transaction signature was generaled. The second line is the base64-encoded signature, it is transaction.

 Reusing Nonce in SignMessage

To investigate whether your private Key (nc) is being reused, we need the signmessageoutput. Here's what you can do:




Look at the first line of the output:



   > Bitcoin: transaction signature

Notice that transaction signature uses a obses variable (p2ph-address-ere). In the Bitcoin standard, the noses are used to be generate random nubers for transactions, but they are not reused across.




Look at the second line of the output:



   > Signature (base64) |

Notice that lines a base64-encoded string containing bc123as its argument. Howver, thee is nop2ph-address-herevariable in this string.

Runecho -n “p2ph-address-here” | bitcoin-cli signmessageto the see thesignmessagecommemanded that the one thessssssssses variable set top2ph-adress-ere. This dewht generate a new transaction signature, it is the so-same as beefore.




$ echo -n "p2ph-address-her" | bitcoin-cli signmessage

   > Bitcoin: transaction signature

  +--------------------------+++

  | Signature (base64) |

  +--------------------------+++

As you can see, the second of the output is still a base64-encoded string bc123as its argument. This suggests that your private key (nce) is note reused across multiple transactions.



 Conclusion

Based on this analysis, it is appeares that you private key (nc) is not being reused across multiple traans. The signmessagecommmand generates for noces for each transaction, and the resulting signature users a different set of values. This one provide of some confidence that your safe is from reuse.



 Additional Tips 




Make to Keep your private Keys (ncs) secure and do not story in the public or accessible locations.



If you're Using Bitcoin for any sensitive purposes, consister generating a new private key time you need it.

Always from the thebitcoin-clicommand wth caution, as it can the generate signatures with the sender's identity. Use the-verbose` opting to enable more detailed logging and error messages.

I hope this helps! If you have any further questions or concerns, feel free to aask.