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 0x9c311f4518f1c5f383de0f68cc584835bdc9ec620079db11dbdec43be2c6cef3. 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/6a181142-04a2-441b-b8bb-3fc28d3a8938.json and https://artists.proofprofile.net/proofs/artist/6a181142-04a2-441b-b8bb-3fc28d3a8938.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Carmen Suite No. 1 (Arr. E. Guiraud): II. Aragonaise
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 0x61f62f6bfae1fe87736f4c8fa5005c7f9c9d52c22e0e2f58cf2f5ea60b65c5cc. 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/HKI199220702 — a six-check JSON result.
Carmen Suite No. 1 (Arr. E. Guiraud): III. Intermezzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a08ccdbc4fc2ba8baba0e7ca8ffd67d60f4fee5ac64877330b123f98f6f0a08. 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/HKI199220703 — a six-check JSON result.
Carmen Suite No. 1 (Arr. E. Guiraud): IV. Séguedille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a19a2bb38d476525aefa195d607ce5952be44c78f51ea18dc3d18b9ddf7e892. 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/HKI199220704 — a six-check JSON result.
Carmen Suite No. 1 (Arr. E. Guiraud): V. Les dragons de Alcala
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe68187f19914e600a643dbff8606ff46ca0e436707c61cce2a6804a2bcd013a. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/HKI199220705 — a six-check JSON result.
Carmen Suite No. 1 (Arr. E. Guiraud): VI. Les Toréadors
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb09883de7201ded51252dd7fe371fbeaf6bf490703960168ab722aaad874b2a. 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/HKI199220706 — a six-check JSON result.
Carmen Suite No. 2 (Arr. E. Guiraud): I. Marche des contrabandiers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd419520181a68899f5b6dc0aec2819bb600b11c3b91d3557812672ee1b91a9. 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/HKI199220707 — a six-check JSON result.
Carmen Suite No. 2 (Arr. E. Guiraud): II. Habanera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a2f17c17bda970f954ec86b1e4930c9354ff5e55d7e2ac336cc17284fb83f6. 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/HKI199220708 — a six-check JSON result.
Carmen Suite No. 2 (Arr. E. Guiraud): III. Nocturne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb47e111af25b30cdc7725a54a58b4c8655e016ef1bff087aba195b3abaabe4d. 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/HKI199220709 — a six-check JSON result.
Carmen Suite No. 2 (Arr. E. Guiraud): IV. Chanson du Toréador
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08376d7f0ca77c50ada29570d4387e46636ef82d1bcc49976406071019450602. 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/HKI199220710 — a six-check JSON result.
Carmen Suite No. 2 (Arr. E. Guiraud): V. La garde montante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31dc734d6bdeb2b16d760d25840199a8e110b17e4775631223387db6491ab806. 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/HKI199220711 — a six-check JSON result.
Carmen Suite No. 2 (Arr. E. Guiraud): VI. Danse Bohème
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe338bde194d7dd369ef734d32a7c0bd2e91cf28f9bafd47d0c62282b8c05d774. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKI199220712 — a six-check JSON result.
Carmen, WD 31: Act I: L'amour est un oiseau rebelle, "Habanera" (Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975ba0af516173b811bb9c46843277358aea7ba4dd791562fff2ccf9e00f07bd. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/HKI199220603 — a six-check JSON result.
Carmen, WD 31: Act II: Couplets: Votre toast, je peux vous le rendre (Escamillo, Chorus, Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8883b1a6d19fb9880e337a5cf3cd641bfb1e3d798039f554e3e0e6905c9b83a. 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/HKI199220606 — a six-check JSON result.
Dvořák: Saint Ludmila, Op. 71, B. 144 (Live)
Bartók New Series, Vol. 22: Choral Works I
Arthur Honegger: Demon De L'himalaya / Regain
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4e4786093b15ef590ec4d6de6c162fc9f7051fb443219f6b2d7ac12dcbb92a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI199283001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3268f9475480b11afcbf61ee41d7ac310765f49d8f7e2f7ce53688fbd8734b7. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/HKI199283002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202a60f889bd34360552485750b86c0961ceec5526f00042085dde1377e3a109. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HKI199283004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda46fa1543891feba04dafe1dc88f2c77d8988f96979e8a2c99878b538561ffb. 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/HKI199283005 — a six-check JSON result.
Carmina Burana: Chramer, gip die varwe mir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8910a951fee6653136e0520d5699b34ed5c21a8c02d877453bfdb1422d53b0. 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/HKI199283008 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0d944d5afeaec52f2bf3ec35665129d06e275d3081f042b8554af51a11a3a3. 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/HKI199283025 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe88401f3094b6cb973561d01f0cc14eeab1e4ecc954b6b132227a80510a4b02. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199992708 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0d944d5afeaec52f2bf3ec35665129d06e275d3081f042b8554af51a11a3a3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199283025 — a six-check JSON result.
Carmen: Carmen, Act I: L'amour est un oiseau rebelle, "Habanera"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d00a2fda04f2ff9e8bbf56b799264d3562a685e50b50dca8600714a12135b0. 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/HKI190023813 — a six-check JSON result.
Nabucco, Act III: Va, pensiero, "Chorus of Hebrew Slaves"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e51c24bb33163e2adb520030af5d1bdc19f8965be9a5df7c2232aa32afa5248. 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/HKI199326501 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c88c56c3ef1954386bff24c9e3cd23747850187e0b0e343358d767016ee8d8. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USB8U1700146 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d0686c230d7a108830ff917d80edcb125c25aaed63858679e71bb3606c02b1. 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/USB8U1601099 — a six-check JSON result.