Sandy Stewart may refer to: Sandy Stewart (singer) (born 1937), jazz singer, mother of pianist Bill Charlap Sandy Stewart (musician) (born 1958), singer from Texas Sandy Stewart (producer) (1930–1
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 0x9c85f184fb24403758277a78ab388246aa8389e5aac4569b8a21cba7b1853dc0. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7a73474-3ebe-49e3-b425-bd5a73a6673f.json and https://artists.proofprofile.net/proofs/artist/e7a73474-3ebe-49e3-b425-bd5a73a6673f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).