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.