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 0xd206c334113b3526b75533094aeefcb98a503eb6526e6c78ae95762ba53ae8b0. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7cbc5b0-331e-4d5a-b75c-263ca9b97994.json and https://artists.proofprofile.net/proofs/artist/b7cbc5b0-331e-4d5a-b75c-263ca9b97994.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Borodin: String Quartet No. 2 in D Major / Brahms: Intermezzos
Schumann: Kinderszenen, Op. 15 / Tchaikovsky: Serenade for Strings in C Major, Op. 48
Schumann: Kinderszenen, Op. 15 - Tchaikovsky: Serenade for Strings in C Major, Op. 48