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 0xd4c218844fc765d87fe504dd72863b9913ff2c8d4c1f65670e7f2bd759c8df85. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07943341-2f53-46ef-a77b-d51c99dc669b.json and https://artists.proofprofile.net/proofs/artist/07943341-2f53-46ef-a77b-d51c99dc669b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Pfitzner / Grieg: Piano Concerto (Gieseking) (1943-44)
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 0x3275d86d984171930c16f241a844bf377427fcd4eca94b4b4e5db38945277588. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMFMG1498910 — a six-check JSON result.
Hamburg Philharmonic Orchestra: Studio 102 Essentials
The Most Essential Classical Music from Italy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5611320468f39f44373e155528c4a531684cc660ee6014710be1e5ade51b528b. 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/CAM460770424 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171736fec47959ed4183ec1a1c31a184252bc6dd286adbeb346d3ad5f6d5e6f4. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/SEWDL9436838 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76caa337fef70e6aad8b0d9bdf91f377a62f31df144fb008eb996af7b77e36d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/SEWDL0753302 — a six-check JSON result.
Nabucco: Va', pensiero, sull'ali dorate (Chorus of the Hebrew Slaves)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1247852cfd79ffece772f79c774646c7546dfa92750da733e7ecdb94be38f97f. 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/CAM460670220 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fa038083347db68c4e6db35b18dc56857e5041f4db5bc3c5301a07e68f56dd. 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/SEWDL0572304 — a six-check JSON result.
Scheherazade Theme (Symphonic Suite Opus 35)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f840c8c1315bddc296b9c122cf6f1fe1c2f75cba590d55855f593d5a195dc72. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/AUV401477449 — a six-check JSON result.
Bruckner, A.: Symphony No. 3 (1873 Version)
Symphony No. 3 in D Minor, WAB 103 (original 1873 version, ed. L. Nowak): II. Adagio: Feierlich
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d018d7b78219f3f10ce7996dacf1324f9d9a3f5bf40c1759333956831c0cc11. 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/DEU920762402 — a six-check JSON result.
Bruckner, A.: Symphony No. 8 (1887 Version)
Symphony No. 8 in C Minor, WAB 108 (original 1887 version, ed. L. Nowak): I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8590fd7f8e2bb61b9a64d6e56ef478db93de5d6a8398c175dda017ea3b9124c5. 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/DEU920963801 — a six-check JSON result.
Brahms: Sinfonie Nr. 2 - Tragische Ouvertüre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49565ef053acc7e7d7fde1953bc10e6f0ae7e218fa69c0062864bde7c54ce987. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEU921167605 — a six-check JSON result.
Symphony No. 1 in C Minor, WAB 101 (orig. 1866 unrevised Linz version, prep. W. Carragan): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb96ad39e4ed800b049cfe9a1228e207e29b141bb5d27af9c4b25f4e0c2f5b47. 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/DEU921163301 — a six-check JSON result.
Symphony No. 1 in C Minor, WAB 101 (orig. 1866 unrevised Linz version, prep. W. Carragan): II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6db74c912b5c090a0f0161bea0b13f32d4bc7da80704d23390ecc3fa9debeac. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEU921163302 — a six-check JSON result.
Symphony No. 1 in C Minor, WAB 101 (orig. 1866 unrevised Linz version, prep. W. Carragan): III. Scherzo: Schnell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ddb5ebc92451898e3ec8dab6864d02969ceca8dee7cc6d10ea016131f8c428. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEU921163303 — a six-check JSON result.
Symphony No. 1 in C Minor, WAB 101 (orig. 1866 unrevised Linz version, prep. W. Carragan): IV. Finale: Bewegt, feurig
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecbc8e4656bdb5b91efdc0df9acc1b92c8f423ad7b06bc4f712d4cafc016d36. 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/DEU921163304 — a six-check JSON result.
String Quintet in E Major, G. 275: III. Minuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf670d21849fc44610d892950185ec514d9badf2c39903c6afa2b5928f1fe1dc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USZDG0600022 — a six-check JSON result.
Bruckner, A.: Symphony No. 2 (1872 Version)
Bruckner, A.: Symphony No. 4, "Romantic" (Original 1874 Version)
Beethoven: Violin Concerto, Coriolan Overture, Leonora Overtures Nos. 2 & 3