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 0x981c68a270f87180df246402e0022eb1ff7a946d31b43f6680bd5c9673705b96. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/101f0f2e-c45b-429c-9064-604e99f89da9.json and https://artists.proofprofile.net/proofs/artist/101f0f2e-c45b-429c-9064-604e99f89da9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto for 4 Violins and Cello in B Minor, Op. 3 No. 10, RV 580: I. 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 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 4 Violins in E Minor, Op. 3 No. 4, RV 550: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4739f96682ffe5d7dc2bf7d7fd407162b79c76d1f2ee374b7e1cca15929c0f07. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA460912833.
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 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 in E Minor, Op. 3 No. 4, RV 550: II. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348ae3a0a4fe582537f1ccf23bb972cbe92171f6fb69d28ef5af38bbda260052. 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/NLA460912834.
Concerto for 4 Violins in E Minor, Op. 3 No. 4, RV 550: III. Adagio - IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302d8a8affd1b413285021b81417d87ffae5143ef99c3bcf78449f686f83b191. 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/NLA460912835.
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.