The Radcliffe Choral Society (RCS) is a 60-voice treble choral ensemble at Harvard University. Founded in 1899, it is one of the country's oldest soprano-alto choruses and one of its most prominent c
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 0x470298df4699e49023e97b85e7d727e2db547996004e8ee0e7e8e0aef8e0821b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b58f611e-f6c0-4473-a4f0-070ea4e04154.json and https://artists.proofprofile.net/proofs/artist/b58f611e-f6c0-4473-a4f0-070ea4e04154.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).