David Montague Rendall (11 October 1948 – 21 July 2025) was an English operatic tenor who developed an international career performing regularly at the Royal Opera House in London and the Metropolitan
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 0xf937fd2766bd1b05db188cb722cb1466700a50ebb89de9aa830043c3ce329974. Chain 2 (Bitcoin): anchored in block 954174 (2026-06-18T03:01:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cdf757d-b1a0-40c8-a2fc-a4f0f7000611.json and https://artists.proofprofile.net/proofs/artist/7cdf757d-b1a0-40c8-a2fc-a4f0f7000611.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).