The Boston Gay Men's Chorus is a group of vocalists located in Boston, Massachusetts. The group currently has over 300 members and has been directed by Conductor Reuben Reynolds for over 20 years. The
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7d543468715b02c2501c8abaadd022144b56fbd8ca2f93d21882a6ea703789. Chain 2 (Bitcoin): anchored in block 953985 (2026-06-16T18:03:53Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e038b43-dcb6-45b7-a6a3-0f644d8313a0.json and https://artists.proofprofile.net/proofs/artist/2e038b43-dcb6-45b7-a6a3-0f644d8313a0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Oz and Beyond: the Music of Harold Arlen