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The trustless backstop behind the Ark card's promise. The vtxo's
genesis chain reconstructs to fully-signed txs (keyspend sigs for
cosigned/arkoor transitions, preimage script-path for hark leaves);
they are zero-fee v3 with P2A anchors, so each hop broadcasts as a
[parent, CPFP child] package via esplora POST /txs/package, one
confirmed hop at a time (TRUC allows a single unconfirmed parent).
After the vtxo tx confirms and the CSV exit delta passes, the claim
spends the delayed_sign leaf with only the user key into the wallet's
own receive address.
Settings gains 'Exit on-chain without the server' with live per-exit
status lines; the claim tx is labeled 'Ark exit' in History. Probing
uses /tx/:txid (definitive 404), never /tx/:txid/status, which answers
confirmed:false for unknown txids.
Also: a fresh visitor opening an ark gift link now adopts the gift's
network automatically instead of being sent to Settings.
Co-Authored-By: Claude Fable 5 <[email protected]>
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Speaks Second's bark/captaind Ark protocol directly from the browser —
gRPC-web over fetch with hand-rolled protobuf, no wasm, no new deps
(crypto via the existing @scure/@noble stack incl. btc-signer's BIP-327
musig2 module).
src/ark:
- proto.js transport, ark address codec, mailbox blinding/auth,
VTXO ProtocolEncoding v2 decode
- send.js arkoor send: checkpoint+arkoor txs, BIP-341 sighashes,
MuSig2 cosign ceremony, signed-VTXO assembly
- board.js onchain -> ark: funding taproot, exit-tx cosign
- refresh.js delegated round (hArk): participation, tx-chain
reconstruction, hash-locked leaf cosign, forfeit swap
- validate.js receive-side verification: chain must land on the vtxo
point, anchor checked onchain, every transition sig verified
- manager.js persistent wallet layer: storage-checkpointed step-machine
actions (send/board/refresh) that survive crashes, mailbox
sync with validation, multi-input consolidation refresh
tools/ark: end-to-end regtest tests (receive, send, board, refresh,
manager incl. crash-mid-send + resume), all passing against captaind
with the bark CLI as counterparty.
Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01QFAcD4V284DvYZZHP7Rxxy
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