Ishak, Ishaq or Eshaq may refer to: Ishak (name), list of people with this given name or surname Isaaq, a Somali clan-family in the Horn of Africa Ishaaq bin Ahmed, the forefather and common ances
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 0x3443b9e724f749f4acc0cff7dbfe347e628344956346b5e43d597dae8901ca47. Chain 2 (Bitcoin): anchored in block 953972 (2026-06-16T16:31:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a843746-da50-4a91-85ca-86225b0a7b5b.json and https://artists.proofprofile.net/proofs/artist/2a843746-da50-4a91-85ca-86225b0a7b5b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).