Bitcoin's BIP138 wallet-backup proposal was merged into the Bitcoin Improvement Proposals repository on Sept. 21, while the specification remains Draft. According to NS3.AI, the proposal is designed to store wallet descriptors and other non-seed metadata in an encrypted file.

The proposal would allow a holder of an eligible extended public key to decrypt a copy without access to the wallet's seed. The article does not provide additional details on implementation or timing beyond the Draft status and the Sept. 21 merge.