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 0xf626eeb239c86ca9d684c5ea92b1e295dab2d566090c1712327f163fb007a9b8. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bfa2f7d8-5547-448f-9b72-c91754923b78.json and https://artists.proofprofile.net/proofs/artist/bfa2f7d8-5547-448f-9b72-c91754923b78.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Dutilleux, H. / Lutoslawski, W.: Cello Concertos
Christian Poltera Plays Martin, Honegger, Schoeck
R. Schumann, C. Schumann & Brahms: Sonatas & Songs
Wie Melodien zieht es mir, Op. 105 No. 1 (Arr. for Cello & Piano)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xc77c1a6853bff20fd0b1afcf98b1fdf17735ed8c4464553db3f6edaa63ecdc11. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEW1967110 — a six-check JSON result.
Sie liebten sich beide, Op. 13 No. 2 (Arr. for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef71e2cb728dba3f1b302cc5ae2553149c97843656f7fa1605c31b4f3ea8169. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEW1967120 — a six-check JSON result.
Brahms & Schumann - Works for Cello and Piano