William McDougall "Mac" Anderson (8 October 1919 – 21 December 1979) was a New Zealand cricketer who played in one Test match in 1946. His son Robert Anderson played international cricket for New Zeal
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 0xef2000f7d211f0390e1718b0d5a1699de96408a59d9a894d4ff13a1f584d83bb. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bca6eea-bed1-40ac-8678-2bf7a4d294a5.json and https://artists.proofprofile.net/proofs/artist/4bca6eea-bed1-40ac-8678-2bf7a4d294a5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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