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 0xfe1204193f10658b85912f19dda991f3a0a2dc2e75eebb83d958b103ff75fbd8. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d2e5892-2f8c-4b55-9e3d-de2a91ffe0b7.json and https://artists.proofprofile.net/proofs/artist/3d2e5892-2f8c-4b55-9e3d-de2a91ffe0b7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Die tote Stadt, Op. 12, Act I Scene 1: Behutsam! Hier ist alles alt (Live)
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 0x06dd850b5ee24ff911ead42f7792ea0b753e3277cfb8cd87977a425c616a9054. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GB6CE2200001 — a six-check JSON result.
Die tote Stadt, Op. 12, Act I Scene 5: Wunderbar! Ja, wunderbar! (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1531e8f2e8d58ad8c957de1e34c6b6b99f4a2adbe5376599332169b74b75cefd. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GB6CE2200005 — a six-check JSON result.
Die tote Stadt, Op. 12, Act I Scene 5: Glück, das mir verblieb (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59be84418c8ea4201fb4b4072e7405a0ea112e0802fd6236ec431b047d855bfe. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB6CE2200006 — a six-check JSON result.
Die tote Stadt, Op. 12, Act I Scene 6: Marietta! Paul... Paul… (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d027cce3eb2880f6edf405c9a822bcef60a05b80e9624ee19154187b5a1a37e. 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/GB6CE2200009 — a six-check JSON result.
Die tote Stadt, Op. 12, Act II: Prelude (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bed493217c25ea6f4d2665abbf90a8bad1d133d81b4f8b2cfb43ae06eff2b29. 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/GB6CE2200011 — a six-check JSON result.
Beethoven: Mass in C Major & Other Sacred Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe169895f1b5ed116d9c0a99b1542defd528401d19a64f6ecf8fc5bc1a8d243c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191933001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a72038752ef2a0e2605e5715c0e70e4cc0a6cc90c40052760f3bd22120e60e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI191933002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ad952a8f12aac2edc6cf8c36cca25c46cd09f54afcec5561ee361d2ace1843. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI191933003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f535ecf88da833b9f4a107d90b03bf22d25171447632ef4e8e0a68759147fa. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/HKI191933004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd038c7ede2d973604990ca20e01d11ee308870d13bf9638732ce90b0ed6352b. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/HKI191933005 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a41ddfeb8cda1d3f28f6978aed9ce00ff81a4166edaca118e9b1bafbaf03ba. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKI191933006 — a six-check JSON result.
Meeresstille und glückliche Fahrt, Op. 112
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56168575c01486874320e02d041b7f4ae3dda94a1c59361545690347da84def0. 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/HKI191933007 — a six-check JSON result.
Leonore Prohaska, WoO 96: IV. Funeral March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672552e04b4ab76d7a48e3038ad914facf4099557b6061d42676db83dfda2a2f. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HKI191835823 — a six-check JSON result.
Celebrate Beethoven: Music from His Middle Compositional Period
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3b7099d43926b2445912e5ab0d7fddb525e956664fa0abb4bafdb7fc1183bd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FIABA0800533 — a six-check JSON result.