right|thumb|250px|Eddy and MacDonald from the trailer for Sweethearts (1938) Jeanette MacDonald (1903–1965) and Nelson Eddy (1901–1967) were a popular screen couple in the 1930s and '40s, specializing
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 0x4bd9bbb242952f2e7f7d0eafb4bd3121367c9f1e7910f0f86ebc918c0494bf9c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7063b6dc-9174-4907-b329-fc6d65fb7acc.json and https://artists.proofprofile.net/proofs/artist/7063b6dc-9174-4907-b329-fc6d65fb7acc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jeanette Macdonald and Nelson Eddy Sing "Ah Sweet Mystery Of Life" and Other Favourites