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 0x3b478a002238106a8261a694eabb3a4d1318d1a6003739f7c4f1e72a6516d87d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3f71cca-fb51-469f-8b04-44cb1f90677c.json and https://artists.proofprofile.net/proofs/artist/c3f71cca-fb51-469f-8b04-44cb1f90677c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto for 4 Violins in E Minor, Op. 3/4, RV 550 (L'estro armonico No. 4): III. Adagio
Vivaldi: The Four Seasons; L'estro armonico / Bach: Brandenburg Concertos Nos.3 & 5; Suite No.3
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 0x3022b8c7cf8bd6c14c6acf7877759f5be071d41cbb19164c97526e7b6e6d8089. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEF057209043.
The Four Seasons, Spring, Violin Concerto in E Major, Op. 8/1, RV 269: I. Allegro non molto – Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e005880b95bf70bbc21bcbe89f61f0ddab3f9018a2e29d65ce6bfad6492139. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEF057200451.
The Four Seasons, Summer, Violin Concerto in G Minor, Op. 8/2, RV 315: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23249443d4c11b40af002a95c3e46f6a78b27b8eff2895342f686ff910aa13f8. 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/DEF057200463.
The Four Seasons, Winter, Violin Concerto in F Minor, Op. 8/4, RV 297: I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb121ce1af4788e462fe13fd823d2e55f62ca32b288056aa22616c4b6b50178a1. 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/DEF057200482.
The Four Seasons, Summer, Violin Concerto in G Minor, Op. 8/2, RV 315: I. Allegro non molto – Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc26eca9ae8aec9725cb0ecc7b9bb8db0d39fd2de0886d019c658fef9fcc629. 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/DEF057200461.
The Four Seasons, Spring, Violin Concerto in E Major, Op. 8/1, RV 269: II. Largo e pianissimo sempre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d66d3e9840b24a540967da7e0bfdcae0191a0e72feeaf782e9eba084bf19d9. 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/DEF057200452.
The Four Seasons, Spring, Violin Concerto in E Major, Op. 8/1, RV 269: III. Danza pastorale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668c8077e6ab809350b45ed331a99f102bed1fd4e66cb76e3bb5d99b65a345ac. 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/DEF057200453.
The Four Seasons, Autumn, Violin Concerto in F Major, Op. 8/3, RV 293: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d862090f849e69c5cfe05c019f942988552acf23ad568ad49c1f6cf90add55. 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/DEF057200471.
The Four Seasons, Summer, Violin Concerto in G Minor, Op. 8/2, RV 315: II. Adagio e piano – Presto e forte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d254ab5d7c4baabc4944cb984f72d9f1d6231d02d02f48a6d98b31988e435a9. 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/DEF057200462.
The Four Seasons, Winter, Violin Concerto in F Minor, Op. 8/4, RV 297: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65ad1c1864c49d0044d3f9bed511e4246e7d8036c413e3f7aab5052b40248c3. 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/DEF057200481.
The Four Seasons, Winter, Violin Concerto in F Minor, Op. 8/4, RV 297: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5effa1d1883d35e1774d638f1eae9af8a0375ae947802ed94fb6bda427daa8c3. 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/DEF057200483.
The Four Seasons, Autumn, Violin Concerto in F Major, Op. 8/3, RV 293: II. Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d1bb3a3c7931d0b4fc64a445b9e838615a0e3aaacd8f5d9fd34b82c398ed4b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEF057200472.
The Four Seasons, Autumn, Violin Concerto in F Major, Op. 8/3, RV 293: III. La caccia. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022797e1cbe3bc2ff50de59d100c32d8ddea63b29222bd7b18d664ff531a5b57. 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/DEF057200473.
Concerto for 4 Violins and Cello in B Minor, Op. 3/10, RV 580 (L'estro armonico No. 10): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96440406e60d842ded6a7b36fd2ce3d77ee899d48264d407e4fd1f157acaece5. 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/DEF057209061.
Concerto for 4 Violins and Cello in D Major, Op. 3/1, RV 549 (L'estro armonico No. 1): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3a6c06d8edb44fdd9ef696aba14ba281b0e490c4650677ce0d316735f2e31a. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T20:58:27Z), 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/DEF057209031.
Concerto for 4 Violins in E Minor, Op. 3/4, RV 550 (L'estro armonico No. 4): IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d9cd3b3f9d6fb05a47de017242436323e7af0c3883532165009228e0a2c85a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057209044.
Concerto for 4 Violins and Cello in D Major, Op. 3/1, RV 549 (L'estro armonico No. 1): III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa331b6784899d1bffbba98a72be479f6bcc30d6204cfbdae0d145b28623912b. 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/DEF057209033.
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. 3/1, RV 549 (L'estro armonico No. 1): II. Largo e spiccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0d872fc1a7fbb7db16e7541e242cf67d5d86f465e8f735e406027897e885d3. 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/DEF057209032.
Concerto for 4 Violins in E Minor, Op. 3/4, RV 550 (L'estro armonico No. 4): I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba040fcc36b25f5579df35ab5922fbc9afca96c3b36ce44ff5d3de71959cc96. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEF057209041.
Concerto for 4 Violins in E Minor, Op. 3/4, RV 550 (L'estro armonico No. 4): II. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff04ddf9ba5c15feacfcab877a34c6097c16ef8385488e5b10cef8ccd459834. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/DEF057209042.