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PalladiumWallet/docs/adr/0018-exclusive-wallet-file-lock.md
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0018. Exclusive OS-level lock on the open wallet file

  • Status: Accepted
  • Area: Storage
  • Recorded: 2026-11-03 (retroactive: reconstructed from code, comments and changelog)

Context

Two processes opening the same wallet could overwrite each other's saves and corrupt state.

Decision

WalletLock.TryAcquire holds a FileStream opened with FileShare.None on a companion .lock file for the session. The OS releases it on exit or crash, so there are no stale locks to clean up. A second opener gets null; permission errors propagate so the UI can show a distinct message.

Consequences

  • Safe multi-instance behaviour without lock-file housekeeping.
  • Protects against concurrent app instances only, not against external tools editing the file.

References

  • src/Core/Storage/WalletLock.cs