Sham may refer to: Arabic use Al-Sham or Shām (شام), the Arabic term for the Greater Syria region, known in English as the Levant or the eastern Mediterranean, which includes the modern countries of
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 0xff9517c9c3a15c85d7b83a3f55f9a899ea650e28c631bbb92455fe5345b07223. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2514472-92d0-4343-9192-5e6f888be006.json and https://artists.proofprofile.net/proofs/artist/e2514472-92d0-4343-9192-5e6f888be006.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).