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 0xeb4ac73477b86f55a70e2094704b33f8ebe88b552544741625b190b74010a1ac. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43fc25a9-b47c-4853-83be-a8ed534347e3.json and https://artists.proofprofile.net/proofs/artist/43fc25a9-b47c-4853-83be-a8ed534347e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x8149ffd302cf32f16d308b633fac3e81b78b8a17f0d7f96f6b03c848a8003391. 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/FR9W12035398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe957349b620281dcc55b575a4f078e65cfe37a31bc7efa5363e9be3216b7b658. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR9W12035401.
Arcangelo Corelli: Sonate da camera, Op. 5
Violin Sonata in D Minor, Op. 5 No. 7: Preludio. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f778a8a2c084889a91d021736a4c1ddf3b883aca28f56d6d70e107f6e2d144. 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/CH6542157001.
Violin Sonata in D Minor, Op. 5 No. 7: Corrente. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca50f65c6986459149eeae6e446ef79ca9444b9afc75c80fd735e0410fda195a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CH6542157002.
Violin Sonata in D Minor, Op. 5 No. 7: Sarabanda. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd9568add5a47882af1d5f312188eb8e8683ea74c2f8d5a0a5625829742f58a. 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/CH6542157003.
Violin Sonata in D Minor, Op. 5 No. 7: Giga. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7e5f46b90559df0b6ef6bd546f6a9cdea00beed855c641cae511ce27f8d414. 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/CH6542157004.
Violin Sonata in E Minor, Op. 5 No.8: Preludio. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc450e8527ccbc9d76bfeff976f530fc50257bc10516247dcf8ebc856852bf2fd. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/CH6542157005.
Violin Sonata in E Minor, Op. 5 No.8: Allemanda. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b8f14ae13ad1f0c8654748f3cd5ee958e2218006a0907be00162fe0fe953f3. 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/CH6542157006.
Violin Sonata in E Minor, Op. 5 No.8: Sarabanda. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe0028bdf97abdd2e3dab9a72fde6572caad9f2fdc1621e59169cd460250812. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CH6542157007.
Violin Sonata in E Minor, Op. 5 No.8: Giga. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf221c912199b0c2850bb75dfda01e7049b95cb2d18913ff6aed7831406bc69b3. 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/CH6542157008.
Violin Sonata in A Major, Op. 5 No.9: Preludio. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ed12b2dc14e01abb88f9f2ee078a4f735e2b72554a7ab578a5a3133783f718. 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/CH6542157009.
Violin Sonata in A Major, Op. 5 No.9: Giga. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d75e35242e19c7ebf4e1f2df431f0f6d492c61e3a960f97b3d3f661d3672e3. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/CH6542157010.
Violin Sonata in A Major, Op. 5 No.9: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0e7b3fa4e695aa967acb7d39753d1cf7e497ab78414203dfd1d246fceab01b. 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/CH6542157024.
Violin Sonata in A Major, Op. 5 No.9: Tempo Di Gavotta. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadae917812a21c7080455e902adfe0191e8120e548640239a13bdae8ddd4b328. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/CH6542157025.
Violin Sonata in F Major, Op. 5 No.10: Preludio. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89112416a917564afa713b6abcd735a75cb28ab8583a142f2ac6d7607848105d. 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/CH6542157026.
Violin Sonata in F Major, Op. 5 No.10: Allemanda. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ffb6c467fe0fdf32ba771bdd3492fbbde8bd7ba930b5da52a5eba5b37beb96e. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CH6542157027.
Violin Sonata in F Major, Op. 5 No.10: Sarabanda. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b59a67db2e7e8d95c1770dc4183215a6a48affa8365d3ae8ecec1423b8446a. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/CH6542157028.
Violin Sonata in A Major, Op. 5 No.10: Gavotta. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48826d86977f2ff8da9a922861c77de9dd0758a68354e28ef61e1ef9884f2947. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/CH6542157029.
Violin Sonata in F Major, Op. 5 No.10: Giga. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3daebc8b79833fecbadcd6732b3c87e63fd29423754e1cfebd61d9d59ecafae. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CH6542157030.
Violin Sonata in E Major, Op. 5 No.11: Preludio. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daa2291b8661e552534f0e1036b147f513ea35e057a1757044c1caceaeb87e1. 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/CH6542157031.
Violin Sonata in E Major, Op. 5 No.11: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb58a059e679c4d28beef00cd222246c192e1510d87802ce69f90397b593b78. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CH6542157032.
Violin Sonata in E Major, Op. 5 No.11: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086f654c008f473b1cc6125a823f9ab0b391add30652b0c7ad853f06757550d2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/CH6542157033.
Violin Sonata in E Major, Op. 5 No.11: Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407197a588471f5a60f8ba9a0ac47dc9e41425b523834d9468ac60224f7cdf37. 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/CH6542157034.
Violin Sonata in E Major, Op. 5 No.11: Gavotta. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa282e4b8c3d1dfc4b1f6792915c70a9b09b2be5d75c25944b779a5bb8805d480. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/CH6542157035.
Violin Sonata in D Minor, Op. 5 No.12: "La Follia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026151c60ef77940223051cc10a037888fb6bac3386d6bba14b2410482c076ae. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/CH6542157036.