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 0xa5f822362ebd6094ff2af3fd4de8e049982be85f15876c063f96f0fa9dcbcb5f. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c673b2c8-80dd-4ee8-8965-143055cb1acb.json and https://artists.proofprofile.net/proofs/artist/c673b2c8-80dd-4ee8-8965-143055cb1acb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto grosso No. 11 in B-Flat Major, Op. 6: I. Preludio (Andante largo)
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 0x0e807b54b93d262552296c11f0fe3953d4c749ea9ab16c4911b465035f9f93d7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232726.
Concerto grosso No. 11 in B-Flat Major, Op. 6: II. Allemanda (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308a7555e4e406bd4a76497bf825039f83ce0b454dd47cb9352ca3a736354880. 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/FR1P71232727.
Concerto grosso No. 11 in B-Flat Major, Op. 6: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa394235aa38f38e98d9e51dfac23b46cb2676e305215cf867732469a57fd43. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232728.
Concerto grosso No. 11 in B-Flat Major, Op. 6: IV. Andante largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d2144989d1eea948f346bb9daed5064958ced9955824ab9b3790f0e50e2fb8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232729.
Concerto grosso No. 11 in B-Flat Major, Op. 6: V. Sarabanda (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6f4db860eef6337b407aff6cb1d500b171aeeed1c61fdb5519c30fceb4bf5e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232730.
Concerto grosso No. 11 in B-Flat Major, Op. 6: VI. Giga (Vivace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0963b5e2dbb4de74ba68c64fb4806d397042618b5dbed28efd1a506a4110b1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232731.
Concerto Grosso No. 8 in G Minor, Op. 6 "Fatto per la Notte di Natale": V. Allegro - Pastorale (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f913184a4ec124d2091d6e2727754b37215cbde2b7e158744c9be20225bcde3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232772.
Sonata a quattro in G Minor, WoO 2: I. Adagio - Andante largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb884063ada5f2ba771e897cd0df74c6cf977c0d66cc6f2a9d15729d1da634bb. 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/FR1P71232741.
Sonata a quattro in G Minor, WoO 2: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242e3441c43c88e876f4832f960358ab449f7e06ba14e83c5211618270e3e934. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/FR1P71232742.
Sonata a quattro in G Minor, WoO 2: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ab74f9cceb8a32dbd8486641b19cd1980a3aa315e10a2a62250635a09ed95a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232744.
Concerto grosso No. 10 in C Major, Op. 6: I. Preludio (Andante largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415c63096548e8ecd99f32f680d26dc92f970bfe4b67070d2dff4a8656449cde. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232746.
Concerto grosso No. 10 in C Major, Op. 6: IV. Corrente (Vivace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfead3eb5dacfc9ce974bf501a12eaa9c55534962e8c7c2c4ad1bf9751c3a21. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/FR1P71232749.
Concerto grosso No. 10 in C Major, Op. 6: VI. Minuetto (Vivace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf0858582e4383d03fa93ce90bce3aa4526b515f7d5b6dc939a3762a1e794c5. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/FR1P71232751.
Sonata a quattro in G Minor, WoO 2: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbf80dd3c4ec7e5a18da0873dc6abbfd03ef09b7669f46eb11e396709ae3bca. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/FR1P71232743.
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
Sonata a quattro in G Minor, WoO 2: V. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5320267966eb5c8b17be79ec27e3bfe32d192ee864330559033af03355e86b. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FR1P71232745.
Concerto grosso No. 10 in C Major, Op. 6: II. Allemanda (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2332c086cb20772066d40d133b52b7db5167c1507ede170a5ac71dabeb735690. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232747.
Concerto grosso No. 10 in C Major, Op. 6: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8ab0dd6ce163e7159509ba9be22e03eb78123c0b6f4efd655660ebf67d232c. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71232748.
Concerto grosso No. 10 in C Major, Op. 6: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e72af9fa29336c0885184fdebb771116c9f3c8350e06be09706c284b6109c5. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR1P71232750.
Concerto for Two Violins and Cello in G Minor, Op. 3, No. 2, RV 578a: I. Adagio e spiccato
Vivaldi: Les quatre saisons et autres concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429d60d56688a0d0b7306f5d61798b64848a90f1523a61e510ae03eebca4d800. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70800180.
Concerto for Two Violins and Cello in G Minor, Op. 3, No. 2, RV 578a: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebb877051751d9b32fa3754bcef2382e16fdac34cf0b8f89951e27cfb0ed9f1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR1P70800190.