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 0x0e3a425e5a3d428a89f18e9821f3417937ab3d667aade12b987c64a56b2d845a. 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/c0143c96-2583-480c-9272-7a76683c4ef8.json and https://artists.proofprofile.net/proofs/artist/c0143c96-2583-480c-9272-7a76683c4ef8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Dido and Aeneas - Realised: Imogen Holst & Benjamin Britten - Act 1: "Fear no danger to ensue"
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 0x125a0215b5b1e519607fee606f3f816506b2f3b34196488325b9a73ed5d8ad9b. 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/GBF077542605 — a six-check JSON result.
The Fairy Queen, Z.629 - Ed. Britten, Holst, Pears / Act 2: "See, Even Night Herself Is Here"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac31dce5fb2d22ababdc54fbeb02650cd5e7b283cedc4f7768acdbbd7e6266b. 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/GBF077041015 — a six-check JSON result.
The Fairy Queen, Z.629 - Ed. Britten, Holst, Pears / Act 3: "O Let Me Weep, For Ever Weep"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304bbfe93fb333c040fdc598241b1764ddd0a1d3a4d69d5b4c41d41f6981305d. 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/GBF077041022 — a six-check JSON result.
Dido and Aeneas, Z. 626 - Realised: Imogen Holst & Benjamin Britten / Act 3: "But death, alas!...When I am laid in earth"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c4aa5444f8018c63555ab90bb58e5a860134c0f2c0f06b82834a2f4f378de4. 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/GBF077542616 — a six-check JSON result.
La traviata, Act I: Libiamo ne' lieti calici (Alfredo, Violetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3387b1a1a89472ae46c26568a52dec7b58ca4ea07b54cc15f7346c9e39de05. 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/GBAYC8000072 — a six-check JSON result.
Klassik 100 Meisterwerke: Klassik die man gehört haben muss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8c5977aaf1ba60a843634d796b8bb31cd7c76916cd7a0a129a572b3a658695. 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/GBAYC8600472 — a six-check JSON result.
J'aime pas le classique mais ca j'aime bien
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194e05af657d76256cfd5d242ca8883be5552c42b4854499cf1a36a0d0674dab. 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/USBC10000832 — a six-check JSON result.
Mozart: Le nozze di Figaro, K.492 - Original version, Vienna 1786 - Act 4: "Contessa, perdono ... Ah tutti contenti"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897c57868fc0a8bcbb7fbec790d987b045ada12c31accabcfe4706834f472c14. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLA508400179 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1ab9be62a87daecfe00e71f64c50313525ede0e0625f3c18d54c7a23e6006c. 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/USSM10018924 — a six-check JSON result.
La Bohème, Act I: Che gelida manina (Rodolfo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cce2adc42a2bb683fe87db8d8e01c097bee0a6bda0a443d9fca6c7adddd7ad. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBAYC9100336 — a six-check JSON result.
Mosè in Egitto / Act 1: No. 1 Introduzione: "Ah! Chi ne aiuta! Oh ciel!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10ad1ab5ff108999540e15c661d494db32d1289ffa06fd395baa0dc797297ea. 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/NLA508009201 — a six-check JSON result.
Don Carlo (2000 Digital Remaster): Nei giardin del bello (Eboli/Tebaldo/Dame)
Orchestra of the Royal Opera House, Covent Garden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154f14ca81a9bccc9e6a16903669234493e44dc4d1a06381699287603c3e6369. 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/GBAYC0001344 — a six-check JSON result.
Mosè in Egitto / Act 3: No. 25 Preghiera: "Dal tuo stellato soglio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1628d8fa567e0acc2d1e693179f948bc47ace8a7dc0a6dfebc0a56048488018. 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/NLA508009241 — a six-check JSON result.
Verdi: La traviata, Act 1: "Dell’invito trascorsa è già l’ora" (Chorus, Violetta, Flora, Marchese, Gastone, Alfredo, Barone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd74a1a56b4b320534ba9243a2f179f716707ee7a1210c605bf6756b52d28dcd. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBAYC8000071 — a six-check JSON result.
Verdi: La traviata, Act 1: "Che è ciò?" (Chorus, Violetta, Alfredo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087ea41c1bc67b814f23278eef61cd71c9dac37b53a5b3de25da7d17e24fa456. 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/GBAYC8000073 — a six-check JSON result.
Carmen, WD 31 / Act 2: "Votre toast, je peux vous le rendre" - "Toréador, en garde"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ca9c31058a0755d32ac9cd8905ff6f4705d5e99bd16727dbe500ed20582154. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLA508901401 — a six-check JSON result.
Best of Opera - Die 50 größten Opern-Arien
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d943bb9524f24d41e878c385ac79f3c7b9b416daa8cb514f68ab774b5d08d0. 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/GBF076610100 — a six-check JSON result.
Ich mag keine Klassik, aber das gefällt mir!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194e05af657d76256cfd5d242ca8883be5552c42b4854499cf1a36a0d0674dab. 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/USBC10000832 — a six-check JSON result.
Faust / Act 4: "Déposons les armes" (Soldiers' Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa660a85d3f6b22467d6f7d9807ba1e19b4440032b5ed9907526aca416a1badd7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBF076611560 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4dbe0598bed807206c5a69f19e874df77cc7a7959a238def32084736c94446. 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/GBF077130118 — a six-check JSON result.
Verdi: La traviata, Act 1: "Si ridesta in ciel l’aurora" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc73b682d3affc798e0b12bf0e2b7cc22bbcd23a384960713dc1a431b022e5ed. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBAYC8000076 — a six-check JSON result.
Verdi: La traviata, Act 2: "Noi siamo zingarelle (Coro, Flora, Marchese)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762e8a3f5946f08581d2069f94585c87364b29c69f10a5e969d2ced2e9105bc4. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBAYC8000108 — a six-check JSON result.