A simple backup scheme for wallet accounts

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@salvatoshi

The descriptors (and their little brother xpub) is only private: unauthorized access allows an attacker, to spy on your funds. That is bad, but not nearly as valuable as taking your funds.

Descriptors could include private keys: bitcoin/doc/descriptors.md at cdc32994feadf3f15df3cfac5baae36b4b011462 · bitcoin/bitcoin · GitHub