Robert Dollar, also known as Captain Robert Dollar (1844–1932), was a Scottish-American industrialist born in Bainsford, Falkirk, Scotland. The title "Captain" was honorary and he was called the "Gran
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 0x8d3ffc07801c282e6f054085b695c4fa712f6796ed59f4ae2ae0d1dee65a2f81. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f09a2b4-eb45-48a8-8d85-445b4d5003b5.json and https://artists.proofprofile.net/proofs/artist/3f09a2b4-eb45-48a8-8d85-445b4d5003b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).