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 0x55ca55ab3d8a62322c4927eb9356aee2f6f564dca74413a3c605eaf85110b252. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7791c45-3de7-410c-b694-df85d1ab5b7c.json and https://artists.proofprofile.net/proofs/artist/c7791c45-3de7-410c-b694-df85d1ab5b7c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Liszt: Concerto for Piano and Orchestra in A Major, No. 2, S. 125 - Rachmaninoff: Rhapsody on a Theme of Paganini, Op. 43
Alexander Yossifov: Concerto for Piano and Orchestra - Pancho Vladigerov: 5 Pieces for Piano, Op. 60
Popular Piano Pieces: Nikolai Evrov (Recital)
Mozart - Mussorgsky - Liszt - Tchaikovsky - Rachmaninoff: Selected Works