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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a0fdc993702f19f7caf6bd648a01eb71e0de3018e78bac8e539d9619e6b89a. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/324b67f7-2226-4675-9798-762f90ed0a9d.json and https://artists.proofprofile.net/proofs/artist/324b67f7-2226-4675-9798-762f90ed0a9d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto for 2 Violins and Cello in G Minor, Op. 3 No. 2, RV 578: I. Adagio e spiccato - II. Allegro
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
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912827.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912851.
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 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912825.
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 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912828.
Concerto for 2 Violins and Cello in D Minor, Op. 3 No. 11, RV 565: II. Largo e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47642925b7ee6852043dff22126fcd3291318139f9a071a0b39c7232c113708f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912855.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912824.
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
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912826.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912829.
Concerto for 4 Violins and Cello in B Minor, Op. 3 No. 10, RV 580: II. Largo - Larghetto - Adagio - Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72885af53ade1c108e9b6929c0616900b4f632b36315059706a4a9e6be3a1a89. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912852.
Concerto for 4 Violins and Cello in B Minor, Op. 3 No. 10, RV 580: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d2a048904ee3cd9e75db560fe864391b09dcdebcf5b5f8cc18b6ac6b9ef3e7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912853.
Concerto for 4 Violins and Cello in F Major, Op. 3 No. 7, RV 567: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4da0d7267c1496a6887e4497be313ee4334194c9e78cfa4b1cd17c9cc69a547. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912842.
Concerto for 4 Violins and Cello in F Major, Op. 3 No. 7, RV 567: II. Adagio - III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1edc5433261e1a61ef278fb7e2244464371a48c8eca960f65fb3e532e07d17. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912843.
Concerto for 4 Violins and Cello in F Major, Op. 3 No. 7, RV 567: IV. Adagio - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde17743bcf8eac75081dd79c6a08bad8b196803a4afed00c1f5413b2e358e73. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912844.
Concerto for 2 Violins and Cello in D Minor, Op. 3 No. 11, RV 565: I. Allegro - II. Adagio e spiccato - III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12065075db0e9c0ad73faacae83b8e8c5fbd16e536174ae2fd2081800ed9f568. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912854.
Concerto for 2 Violins and Cello in D Minor, Op. 3 No. 11, RV 565: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1997aca56416eda6ea770ead949c2032cdba4277fd3c012cdce9fc1ff9d507. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460912856.