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feat(tips): grin public tips (voucher model via grin node get_outputs + get_kernel)

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Grin as a new asset arm in the tips machinery (no grin-lws change, no custodial
grin_transactions/grin_outputs port):
- GrinClient::get_outputs([commit]) (funding: present+height=confirmed) +
  get_kernel(excess) (sweep spend-height); reached via state.chains.grin.
- create-gating (supported_tip_asset grin, validate 66-hex commitment,
  confirmations_for_asset grin=10), grin_commitment column (migration).
- confirmation worker grin arm: get_outputs present -> confs; amount AUTO-VERIFY
  with warn (voucher hides amount; not a theft vector; matches legacy).
- sweep reconciler grin arm: get_outputs-absent + get_kernel height at depth 10 ->
  settle; absence-without-kernel -> no settle (recoverable, never missettle);
  reorg revert only on commitment reappearing; probe error never settles/reverts.
- 5 grin tests + pure-helper unit tests; 251 lib + 24 tips green.

Amount-verification note: the voucher's bulletproof rewind nonce is random +
untransmitted, so it can't be rewound today; a clean non-custodial fast-follow is
to have the client send the per-voucher rewind nonce and verify via rangeproof
rewind (nonce reveals amount only, not spend authority).
This commit is contained in:
jwinterm
2026-07-10 18:40:56 -04:00
parent 5d8d5e193f
commit 1d6d67faa5
12 changed files with 695 additions and 30 deletions
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src/api/capabilities.rs
+3 -4
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@@ -334,14 +334,13 @@ fn feed_advertised(config: &Config) -> bool {
}
/// Whether public tips are actually serveable: the feature is on, a share-URL
/// base is configured, AND at least one supported tip chain (btc/ltc/xmr/wow)
/// base is configured, AND at least one supported tip chain (btc/ltc/xmr/wow/grin)
/// is serviceable. Mirrors the chain/relay presence-downgrade — never advertise
/// tips an instance can't escrow on or build share links for. (Grin is out of
/// the tips port, so it is not a supported tip chain here.)
/// tips an instance can't escrow on or build share links for.
fn tips_advertised(config: &Config) -> bool {
config.features.tips
&& config.tip_share_base.is_some()
&& ["btc", "ltc", "xmr", "wow"]
&& ["btc", "ltc", "xmr", "wow", "grin"]
.iter()
.any(|asset| chain_serviceable(config, asset))
}