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 0xb321310e614add47cb02fb2461cc5980fd3b938deb2aa5a6eb0029ea697c4474. 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/22ad6d03-a52b-4809-bfdf-be4d94abf76f.json and https://artists.proofprofile.net/proofs/artist/22ad6d03-a52b-4809-bfdf-be4d94abf76f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x82159941476c1ce34bbdb9f4ed52bbdf34d6c48dc58c0440d48620f229c64e07. 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/GBBBA1800638 — a six-check JSON result.
Solomon HWV 67 / Act 3: The Arrival of the Queen of Sheba (Arr. Recorders & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a234bbc62ab2c750ee05d5f64af7160c5da1540d051ff30ec2aeca729d13595. 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/GBBBA1800639 — a six-check JSON result.
Oboe Concerto in D Minor, BWV 1059R: 1. Allegro (Performed on Recorder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c7468e3cae04f432f3a2036ab7dd791c2b5051485a4475ce0c2770c9ec91f5. 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/GBBBA1800640 — a six-check JSON result.
Oboe Concerto in D Minor, BWV 1059R: 2. Adagio (Performed on Recorder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e15c8f7925acaa0e98ce96744b12df0814fca4052f92dc8b1b6469eebeacc98. 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/GBBBA1800641 — a six-check JSON result.
Oboe Concerto in D Minor, BWV 1059R: 3. Presto (Performed on Recorder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730e83084afb96b0025a2a21070fde1847ed9424ba1a9ff46a11426e4755013b. 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/GBBBA1800642 — a six-check JSON result.
Matthäus-Passion, BWV 244 / Zweiter Teil: 39. "Erbarme dich" (Performed on Recorder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36138fad176a54ae72794dc79a54224766bb5edb8370d708b07b0e5714700f7a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBBBA1800643 — a six-check JSON result.
Orchestral Suite No. 2 in B Minor, BWV 1067: 7. Badinerie (Performed on Recorder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510622de25977e5a6b7193f582d4ddf018e73451d1482d69b2831271e8d57031. 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/GBBBA1800644 — a six-check JSON result.
Sonate concertate in stil moderno à 2 e 3 voci, Libro primo: Sonata seconda (Arr. Recorder & Lute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b1f935855bb4155df55620aece60eb90adbcae9e145ddb01dbb130dd5b681e. 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/GBBBA1800645 — a six-check JSON result.
Recorder Concerto in F Major: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d88e84b3727dca91cc468c1aa83f9cecc22a188ab75922d051dca306467d73. 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/GBBBA1800646 — a six-check JSON result.
Recorder Concerto in F Major: 2. Siciliano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b750c7f96f3156c61a450e25dfab786701dab93cd4f26b0a268e16e0a7a7cd. 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/GBBBA1800647 — a six-check JSON result.
Recorder Concerto in F Major: 3. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e123b723ff9967c4ff751d00a151ea2f1aeaa7b81f0cee7c3a3aac131358867. 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/GBBBA1800648 — a six-check JSON result.
Couplets de folies (Arr. Horsch for Recorder & Lute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00fe9807241c2407372140b47f4c571f497a2596d723944ecc4cfeb39c35084. 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/GBBBA1800649 — a six-check JSON result.
Pièces de clavecin - Troisième livre / 14e ordre: Le rossignol-en-amour (Arr. Recorder & Lute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1acf5d80a40bdae75f94225b7f2ff860a9a60e6c81878919c1ed295c22586f3. 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/GBBBA1800650 — a six-check JSON result.
Recorder Concerto in C Major, Op. 17, No. 1: 1. Gaiement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0940f387f4294aed2d62befbaa2b67e9e9720bc968aa6dee2d885329aeb0c816. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBBBA1800651 — a six-check JSON result.
Recorder Concerto in C Major, Op. 17, No. 1: 2. Lentement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d3a74d1d9174fccb75408c8c2ffeb69005210d8d8bd06c58d0cb3f3d437a0e. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GBBBA1800652 — a six-check JSON result.
Recorder Concerto in C Major, Op. 17, No. 1: 3. Légèrement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1a8b499172d7a482163c5afeb6346dedcc644237ac04fe4b08c2472e4c369f. 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/GBBBA1800653 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af7f83b3bd670f768568c9c6a3ee13b451b084c84a52ee90d65eae63cbd1950. 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/GBBBA1800654 — a six-check JSON result.
Dido and Aeneas, Z. 626 / Act 3: "When I am laid in earth" (Dido's Lament) (Performed on Recorder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13aeaf517297494e02d8453ff1625f534351f696515f1f9213b621f8c17694d6. 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/GBBBA1800655 — a six-check JSON result.
Der Fluyten Lust-Hof: 27. Engels nachtegaeltje
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9470422b12847b1e18ea79ee38d1662479cf9708cf2629f57307e4dba6a6c128. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBBBA1800656 — a six-check JSON result.
Scherzi da Violino Solo, No. 1: Suite in A Major: III. Sarabanda
Concerto for 2 Violins and Cello in G Minor, Op. 3 No. 2, RV 578: I. Adagio e spiccato - II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e5ea9b542b27107d534e46c6af1111a1b85e3b81ab5b54ff8979fc8d4127b5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLA460912827 — a six-check JSON result.
Concerto for 4 Violins and Cello in D Major, Op. 3 No. 1, RV 549: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3c892b284d2f5d161306e241879e73b1d4016f2ffae1a53f194139bf7b4a3d. 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/NLA460912824 — a six-check JSON result.
Concerto for 4 Violins and Cello in B Minor, Op. 3 No. 10, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb156fa6caaf5002b09c62577953e37f1afcb1f90a5b345ccb0509cd42d9126ca. 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/NLA460912851 — a six-check JSON result.
Concerto for 4 Violins and Cello in D Major, Op. 3 No. 1, RV 549: II. Largo e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca7eaaeac20814fac733f913eb208bdb67e93d189aa5ec94335763b0ba4c16d. 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/NLA460912825 — a six-check JSON result.
Concerto for 4 Violins and Cello in D Major, Op. 3 No. 1, RV 549: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad926889091bfce924785763e923647f2d237d1f525fbc9b147b68f251d473d. 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/NLA460912826 — a six-check JSON result.
Concerto for 2 Violins and Cello in G Minor, Op. 3 No. 2, RV 578: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d39893ed9dd7a2f97b71e059cc7b6fe826629bf1be4f4febf2bf2e54c32df0c. 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/NLA460912828 — a six-check JSON result.
Concerto for 2 Violins and Cello in G Minor, Op. 3 No. 2, RV 578: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf64ea36039be2e30ba193e07265e7ad21d76ae999a9be1cb439c50099e6a0ec. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLA460912829 — a six-check JSON result.