The Cathedral Quartet, also known as the Cathedrals, or the Cathedral Trio was an American southern gospel quartet who performed from 1964 to December 1999. The group's final lineup consisted of Glen
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbb53f7e3e24773e430a025503984a3bc25988dfc08ceec7228788833b0f928. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbcd87ac-ce4f-47c0-9190-1e02b17b9737.json and https://artists.proofprofile.net/proofs/artist/bbcd87ac-ce4f-47c0-9190-1e02b17b9737.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).