Sandeman is a surname. Notable people with the surname include: Albert George Sandeman (1833–1923), British wine importer and governor of the Bank of England Bill Sandeman (born 1942), American footb
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 0xf15455d5c7d78c33ba9ccc13b093c2cdeb58a0e61a982cb6b1796d4ba1ccffbb. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f536b5f0-8cf8-41d2-b41e-6bf075defe6f.json and https://artists.proofprofile.net/proofs/artist/f536b5f0-8cf8-41d2-b41e-6bf075defe6f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).