Hello, <br /><br />I made a post on <a href="https://delvingbitcoin.org/t/file-format-for-recovering-descriptor-wallets/1115">Delving Bitcoin</a>
 describing a file format for importing and exporting descriptor-based 
wallets. After further discussion, I believe it is suitable to propose 
as a BIP, and I am seeking further feedback. <br /><br /><b>Motivation</b><br /><br />As
 to not simply repeat the motivation section in my reference 
implementation, I will try to include some new thoughts after leaving 
this proposal alone for a while. Inheritance is a difficult problem when
 considering heirs that may not be technically apt. There are many 
services indeed that build around a smooth inheritance model, yet these 
entities may also terminate operations in the future. My feeling is the 
missing component of truly robust inheritance is an open standard for 
backing up wallet data. Mnemonic phrases are great, however a set of 
mnemonics is not sufficient to recover the descriptor for any number of 
potential configurations. <br /><br />A simple file type to backup the 
public metadata about a wallet, potentially including directions, notes,
 and public descriptor data, would alleviate challenges for heirs when 
attempting to recover funds. Further still, the file would also allow 
interoperability between semi-custodial services that offer inheritance 
services. One service may fall as another one rises, but customers may 
simply export their wallet metadata with a few clicks if contained in a 
file. Importantly, an heir need not know what a descriptor is, only that
 their benefactor has given them the specified file. <br /><br /><b>Implementation</b><br /><br />I
 wrote a reference implementation in Rust with the link contained in the
 Delving Bitcoin post. After further thought, I am thinking it makes 
more sense to closely follow, or even adopt, the data encoding used in 
PSBT. Reading and writing to files should be made as easy as possible 
for developers, so I believe a simple key-value mapping would see the 
most adoption. <br /><br />Thank you for reading, and if you have further feedback or would use such a file for managing a wallet, please let me know!

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