Lawrence Davidson is a retired professor of Middle East History at West Chester University in West Chester, Pennsylvania. He is the author of Islamic Fundamentalism, Cultural Genocide and has focused
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 0x9098250eee777ff4d3e5cba078718f2281d69e34a677a9e6d5c06615380cb8ed. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f002a28d-79e2-4342-af0c-b86f65084a72.json and https://artists.proofprofile.net/proofs/artist/f002a28d-79e2-4342-af0c-b86f65084a72.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mussorgsky: Boris Godunov (Sung in English) [Live Recording 1956]
Wagner: Götterdämmerung (Live Recordings 1957)