coinosv3.git/tools/ark-prune-test.js, branch fdroid-v1.9

Ark: persist vtxo bytes as base64 (a third smaller than hex); hex still read, hex still on the wire.

2026-09-10T14:09:45Z

The live coins' signed bytes are most of a deep wallet's state — 560KB of hex, which localStorage then holds as UTF-16. vtxoBytesToStr/FromStr in proto.js persist base64 and read either form, _addVtxo writes base64, and pruneArkState converts hex to base64 on every save, so an existing state migrates itself the first time it saves. Measured on a live deep wallet: 904KB → 665KB (-26%), all 41 coins decoding identically. The sync wire (slimArkForSync) keeps sending hex for now: a device still on an older build would otherwise fail to decode every coin merged from a newer one. Flip it once pre-2026-09-10 builds are gone. Co-Authored-By: Claude Fable 5.1 Claude-Session: https://claude.ai/code/session_01Nw1Dijik1tLVKRM1WkU7xE

Ark: local state stops growing forever — spent coins shed bytes, done actions shed hex.

2026-09-10T13:59:13Z

pruneArkState runs on every manager save: a spent coin loses its signed bytes once its spend is 30 days old and no in-flight action names it (a spent coin can never take the exit those bytes exist for), and an action done more than 7 days ago loses the output-vtxo hex it minted (the change / HTLC coins live in `vtxos` in their own right). Ids, amounts, inputIds and preimages stay for history rows and spend dedupe; failed ln-pays keep their HTLC bytes for the refund. Selective and idempotent; unit-tested. Measured on a live deep wallet the immediate saving is small (every recent spend is inside the window) — what remains is the live coins' own chains, which only a renewal shrinks. The change is a growth cap, not a diet. Co-Authored-By: Claude Fable 5.1 Claude-Session: https://claude.ai/code/session_01Nw1Dijik1tLVKRM1WkU7xE