Jack O'Brien Dash (23 February 1907 – 8 June 1989) was a British communist and trade union leader, famous for his role in London dock strikes. Born in Southwark to a family which was often in poverty
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 0x1101335de1d73bd2329808ce06abdd683c08c02770de196d655f3edb394cb720. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fcda32d1-ccd4-4342-9ac9-c7fc52b7229e.json and https://artists.proofprofile.net/proofs/artist/fcda32d1-ccd4-4342-9ac9-c7fc52b7229e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).