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 0xdd437c0d8ed54454271ce71c22eb90588a9ee84cb3f9a967cb2b6a12ff6a2079. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb7ebdfd-c9b4-4157-940c-9dcf8d6793d3.json and https://artists.proofprofile.net/proofs/artist/eb7ebdfd-c9b4-4157-940c-9dcf8d6793d3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Orchestral Music - Manner, F. / Spohr, L. / Labitzky, J. / Kruttner, T. / Smetana, B. / Hoch, T.
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 0x3bbf134cbb6df07aa10c8894c855cbd60a2d87cb1f1936310dbb8793b588cdb4. 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/DEB269900157 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3002bd6a83077d337827f150a69c943bce0c6ea18508833a7783f661164d59df. 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/DEB269900166 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f30f1d40f18472327af0cf4638d57c2ace5bde6892fd0b1096f79cb31e4298. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB269900168 — a six-check JSON result.
Lohengrin: Act III Scene 1: Treulich gefuhrt, ziehet dahin (Wedding March) (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc726343f0943e49a140ef255097fe9d4339e89c0f3bccd592bbfd049029c1a0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAD60900432 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10697096af6b5fbcffdccdd38649793d6939de4973b864107b767a71f68477a7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEAD60900431 — a six-check JSON result.
Chants du soir: Au bord de la mer (arr. H. Geese)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4b933c9cb9013bd07f5d39bc78d0ade7efd47923236385bf233982262fa1fc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USB8U1012599 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4650d73ed134d20d557a695845ed25cfefa025389ca6f2eb17989e10c195bae. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEAD60900401 — a six-check JSON result.
La vie parisienne (Parisian Life): Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc7f6eb8ff126e197fb48981e1bf60cea002b8f90b088d937d24809fd4c0fa2. 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/USB8U1012596 — a six-check JSON result.
Lohengrin: Act III Scene 3: Heil, Konig Heinrich! (All The Men)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083cde667cd07f4f958e72380b42c5eddcdbedaa57ef685e678df4c6efc9f438. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEAD60900438 — a six-check JSON result.
Lohengrin: Act I Scene 1: Hort! Grafen, Edle, Freie von Brabant! (King's Herald)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5aa47b529941735b9a74c72048bd97edfccfdf6e6fbe3e1aac9e34608809534. 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/DEAD60900402 — a six-check JSON result.
Lohengrin: Act I Scene 3: Durch Gottes Sieg ist jetzt dein Leben mein (Lohengrin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121848094e2e2bca85972eba3ac7377a7e26fbb162ee1ff35176590f8e212e17. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEAD60900412 — a six-check JSON result.
Composers In Exile - Zemlinsky, A. Von / Schreker, F. / Schulhoff, E. / Ullmann, V. / Hindemith, P. / Schoenberg, A. / Milhaud, D.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144cc490cc6615a5d71eb84fd77134e45a833031c9a8ff93a378b569fc4c1b67. 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/US2TL0943804 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784451057ddc6dea8868337722452a0f45251498b19b557f5d3cb8461effea31. 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/USB8U1014777 — a six-check JSON result.
Lohengrin: Act I Scene 3: Nun sei bedankt, mein lieber Schwan! (Lohengrin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1979e55ccc4f206ba5fe163431ff570d109092a1574799adec5a43db7650449c. 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/DEAD60900408 — a six-check JSON result.