Robert Marshall may refer to: Robert Marshall (magician), medieval magician's assistant allegedly involved in a plot to kill Edward II of England Robert Marshall (Irish judge) (1695–1774) Robert Ma
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 0x46f7e6469810e2af6a838c2309f0c65f2e23be03509ef3eed355d27633459c6c. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05122df0-3a4d-41e9-805a-3810b8d0280c.json and https://artists.proofprofile.net/proofs/artist/05122df0-3a4d-41e9-805a-3810b8d0280c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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