Asier Polo is a Spanish cellist. Biography Polo was born in Bilbao, Spain, where he studied at the Conservatory of Music with Professor Elisa Pascu. In 1987–1989, he won first prizes in cello and cha
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 0x7929854b87ffcdd43fc982a762b2659f7274c7003d8206256057f2c988a418ad. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80dec517-2d12-4e7d-9ab7-c42664a4d3c4.json and https://artists.proofprofile.net/proofs/artist/80dec517-2d12-4e7d-9ab7-c42664a4d3c4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Boccherini, Vivaldi & Haydn: Cello Concertos