A simple backup scheme for wallet accounts

pyth · August 7, 2025, 6:49am

Since last week I’ve been working on an Rust implementation based on this scheme & comments that have been made in this thread:

I’ve also started to write draft spec:

github.com/pythcoiner/encrypted_backup

BIP.mediawiki

6c165bc87

<pre>
  BIP: // TBD
  Layer: Applications
  Title: Bitcoin Encrypted Backup
  Author: // TBD
  Comments-Summary: No comments yet.
  Comments-URI: // TBD
  Status: Draft
  Type: Standards Track
  Created: // TBD
  License: BSD-2-Clause
</pre>

==Introduction==

===Abstract===

This specification applies to encrypting '''wallet descriptors''' that contain only '''public keys'''. 
It is NOT intended for descriptors containing private keys. 
The encrypted format is intended for long-term offline backup storage, not for interactive processes.

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tldr : it define a broader scope of what can be encrypted and add few useful metadas to the encrypted payload:

version
list of derivation path (optional)
the type of content
the encryption protocol used
the nonce used in AES-GCM