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renews on its own and no renewal fee is paid unless the user opts in
Why: renewal fees were "money passively draining" to people who thought they had a custodial wallet (Stacker News, 2026-10-22). Measured over Sep–Oct: 84% of what users paid came from the client's own consolidation round at 20 coins (0.2% + 300 on every fresh coin), the rest from 300-sat rounds that each cohort of Lightning-received coins (30-day pool lifetime) triggered on its own schedule. The ASP itself honors a coin past its timelock — rounds and offboards never checked expiry, and captaind's allow_expired_arkoor (now on at ark.coinos.io) lets arkoor spends through too — so expiry only ever meant "the exit is gone", which most people coming from v2 never had.
Settings → Spending gets a Custody card with three tiers:
- coinos holds my coins (default): no renewals, no fees; a coin past its timelock shows as "held by coinos", stays spendable and receivable, and is left out of a unilateral exit (there is nothing on-chain for it to take).
- Keep my own exit: renew in the last hours (free bracket + base), the server backstop registered 36 blocks out and snapped to a 48-block grid so every wallet's orders share one round.
- Renew a week early: 1008 blocks out on a 144-block grid (0.1% + base).
renewPolicy() in ark/manager.js is the one table; the app, the service worker (the mirror carries the tier) and the Manage page all read it. Only shown on servers that honor expired coins (presets carry honorsExpired); elsewhere renewal stays automatic.
Manager: honorsExpired makes a past-timelock coin ordinary money (balance, selection, receive validation via acceptExpired) while a server refusal (expiryRejected) still excludes it; such coins spend LAST so an older build on the receiving side almost never meets one. A once-per-wallet rescan re-reads the mailbox and adopts coins older builds refused as expired, un-forgets expired dust, and clears stale refusals. The refresh gate that retired a renewal of expired inputs is gone (the server accepts them; the Manage page's Renew of exactly those coins was failing silently). Automatic consolidation is gone; the send cap goes 24 → 48 coins; small change (<1,000 sats) folds into a renewal that happens anyway.
Server (cs:~/ark/captaind-main.toml, restarted): allow_expired_arkoor = true; pool vtxo_lifetime 4320 → 8640 so Lightning-received coins live as long as the rest.
Tests: tools/ark/custody-test.js (policies, honoring, ordering, grid snap, validator), tools/ark/custody-ui-test.js (the card, held coins, exit count, switching), nwc-sw-test updated for the tier the worker reads.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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0.6.0 servers require the new hashlock clauses (OP_SIZE 32 guard) for
Lightning and rounds. New policies/transitions carry the v1 scripts and
type bytes; _v0 variants keep old vtxos reconstructing and exiting.
The retired third-party HTLC policy is dropped (upstream took 0x08).
Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01M5kFodm9azZJVTQxnkDdKe
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The warning: when the Spending balance minus round fee is under the
330-sat round minimum AND a vtxo enters the renewal window, auto-refresh
can't save the coins — a wallet-screen notice (and a daily local
notification, when permitted) says to receive any amount or spend
before the deadline. New walletNotices feature hook renders under the
balance card.
The amnesty: sub-dust vtxos have no unilateral exit to protect, and
regtest proves captaind keeps cosigning their spends past expiryHeight —
even after the watchman claims the backing on-chain
(tools/ark/expired-dust-test.js). Only hal's own receive validation
stood in the way; it now exempts sub-330 vtxos from the expiry check.
Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015QwAtBSpKvECqp1rHLHjJk
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The ASP is the HTLC counterparty (second.tech's protocol), so no external
swap provider is needed: paying a bolt11 converts pubkey vtxos into
ServerHtlcSend vtxos the server can only claim by revealing the invoice
preimage; receiving grants ServerHtlcRecv vtxos claimed by revealing ours.
Failure paths cosign the HTLC back (revocation) — proven end-to-end against
regtest captaind, which independently derives the HTLC taproots.
- ark/lightning.js: bolt11 decode, lightning fee schedules, all pay/receive
gRPC-web wrappers (cosign, initiate, status, revocation, hold-invoice
receive flow, anti-DoS attestation)
- ark/send.js: arkoor builder generalized to policy outputs (pubkey /
serverHtlcSend / serverHtlcRecv), two-leaf taproot trees, HTLC clause
scripts, reusable per-part cosign helpers for package RPCs
- ark/manager.js: ln-pay and ln-recv crash-safe action state machines
(deterministic receive preimages from the seed, chain 5), mailbox
lightning notifications, unpayable-invoice -> instant revocation
- proto.js: lightning ArkInfo fields + mailbox lightning message decode
- validate/refresh: policy-aware vtxo validation and reconstruction
- features: bolt11 routes via ark when the balance covers it (Boltz stays
the fallback), lightning-invoice receive on the Ark pane
- tools/ark/ln-test.js: harness proving HTLC cosign + revocation against
captaind; manager-test.js updated for the consolidated bc-container chain
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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