Mari Black is an American multistyle violinist, fiddler, and composer from Boston, Massachusetts. She has won national and international accolades in many styles of music, including being named the 2
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 0xdb32f6dfc91ca6289387bea46b96d6f671aacba543756a37145d154cd36ecc6c. Chain 2 (Bitcoin): anchored in block 953978 (2026-06-16T17:11:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2bf167cf-7249-4896-9a35-bc9fe2565def.json and https://artists.proofprofile.net/proofs/artist/2bf167cf-7249-4896-9a35-bc9fe2565def.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).