Sketch or Sketches may refer to: Sketch (drawing), a rapidly executed freehand drawing that is not usually intended as a finished work Arts, entertainment and media Sketch comedy, a series of sh
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 0xbb40cc2eaa2fdeb15012aafe376fb3935ad64976355c44e868c3498d97a9a79f. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d2d027f-e86a-4072-8e5d-0fc8731c5a64.json and https://artists.proofprofile.net/proofs/artist/5d2d027f-e86a-4072-8e5d-0fc8731c5a64.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).