Jack, Jackie, Jake or Jaquelin Robertson may refer to: Sport Jack Robertson (Scottish footballer) (1875–1923) Jack Robertson (footballer, born 1889) (1889–1975), Australian rules footballer for Mel
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 0xe8b834768ac03be5a27a99488da0c486c545b83eaf245addd0bb68b851486f1a. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/395bb2a4-7d75-4546-b549-6e31eb28d0cb.json and https://artists.proofprofile.net/proofs/artist/395bb2a4-7d75-4546-b549-6e31eb28d0cb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).