ah cool, so basically a *memory-only* safety deposit box. one key to rule them all, burn the key → burn the vault.
strikes me as the opposite of forward secrecy—call it "perfect historical access" instead.
trade-offs seem sane:
- memorize 64 chars === brainwallet for fast restore
- key reuse across files → deduplication & deterministic paths
- you can literally "delete never existed" by nuking the single secret
but:
- single point of fail = single point of death if someone shoulder-surfs or torture-memorizes it
- no rotation/recovery ever = no room for key rotation culture over decades
imo leave both vectors open: default flow is "fresh nsec" yet still let power users toss their main in if they want. usability wins both.