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 0x85a6ed0bf6b06da71afd542a9ed04da1161ecf7773e76196b5feaa3eb787ed55. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1fa6ea8-f90f-460e-98ab-8acbad8c5105.json and https://artists.proofprofile.net/proofs/artist/c1fa6ea8-f90f-460e-98ab-8acbad8c5105.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
String Quartet No. 1 in G Minor, Op. 27: II. Romanze: Andantino - Allegro agitato
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 0xbdab704e7c4d64aa9d62b6429cb5c0e52ae4283269660b59b171be5df743ec70. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199245602 — a six-check JSON result.
Lyric Pieces, Book 5, Op. 54: No. 3. March of the Trolls (Trolltog)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3300306f3f74c533e503bd64afcecd3177b9b48af235a77a9883c21bd22d634d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199506203 — a six-check JSON result.
A Guided Tour of the Romantic Era, Vol. 13
A Guided Tour of Nationalism in the Romantic Era, Vol. 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73f66fc28bcf22227723af38071d78c013b677b6cb8d3fa99459ff482aa70b2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300101 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9730a6962bc4c1756d9077801638bab6653198c4d955c177e3841f6fd68b17. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300103 — a six-check JSON result.
Trois chansons bretonnes: No. 1, La nuit en mer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72a2ae1006488f7872b9a11db24a9a6c693dfa64ad87605e68d34c2fec0e96b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300104 — a six-check JSON result.
Trois chansons bretonnes: No. 3, Soir d’été
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7609dc45af8e2d1de95ef0e980ce75de5c5668c1377f33d4257a2be98a756573. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300106 — a six-check JSON result.
4 Quartets, Op. 92: No. 1, O schöne Nacht!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1795ee7e5906254d1f2ca865807b0d5abaf0d101349f05390ca72bd6b32336c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300107 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1897ba7097346f7a55e1531fec387e6d240ff01f592810fee5ca3f6fd21efc4. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300116 — a six-check JSON result.
Drömmarne: No. 2, De till dalens hyddor smyga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a81dc17c6134633ee511b4c1759b6cf4103093f8f705e1ced35cd54084b6d4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300117 — a six-check JSON result.
Drömmarne: No. 3, Till den gamles bädd de gå
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d5725dafbb9dc93b86038b90fbd8953b9c7451e6a9bc4f0a016cae51ef4e39. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300118 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f6f90798b04c82e26abb8890103be5eef2ba561b01fc6012f7bdbe3d781fe6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300119 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27b53d20b137cfd599d40afeeb0024629005694b40851a8eb713cef74633c05. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300120 — a six-check JSON result.
Drömmarne: No. 6, Vid sin lampa tänkar'n somnat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932c565c7d550b35bf1fee61dc1e5e00d43d578d8cf3ee793855b0e69da13e0f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300121 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8712e3fdcb7d65d557eca7e7f4eb638f2333952294fc135684f68d67f7f96af. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300122 — a six-check JSON result.
Drömmarne: No. 8, Med en barnbön på sin mun
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b73f91e63e978b49c317b5190b52fc5763b03ddfced80f04a509c36cc661699. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE2FO1300123 — a six-check JSON result.
Suite für Violine Solo, Op. 123;I Introduction - Allegro risoluto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9288fcd6879370bd5bdbef7e106145e1bd59e8baca9e2993c8acc29a213a9c73. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1735060 — a six-check JSON result.
Suite für Violine Solo, Op. 123;II Sarabande - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbbcc53d0b9256e083abee3f4a9a9141f50ba973a4416f784b2a2c08b86cee4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1735070 — a six-check JSON result.
Suite für Violine Solo, Op. 123;VI Minuetto I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8a50696e08e1634c400cafb99778114b484f13642db0f4f17e57699ccfa352. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1735110 — a six-check JSON result.
Hjalmar Borgstrøm Complete Works for Violin and Piano
Violin Sonata No. 1 in F Major, Op. 8: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46913ebd0ce560c91951abeb5d2eb9b10f92dccd700eacfb256efb5453a1436c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644501 — a six-check JSON result.
Violin Sonata No. 1 in F Major, Op. 8: II. Allegretto quasi andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026541bcb8f77d0dcc8fbdf4eabec76ec46b8d7835ad9b5044e5368341e3d146. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644502 — a six-check JSON result.
Violin Sonata No. 2 in G Major, Op. 13: I. Lento doloroso: Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a5b9a67a066a9664f3b0408385709d70baa5c6ec10e3bd7034fffbb4b398cd. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644504 — a six-check JSON result.
Violin Sonata No. 2 in G Major, Op. 13: III. Allegro animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47ccbe14a04b79109a57e920f74a9e04ecbef7635e8ca1e9fff8897da7501ea. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644506 — a six-check JSON result.
Violin Sonata No. 3 in C Minor, Op. 45: I. Allegro molto ed appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f4ded95bf0ec8a1dae3708b8ab49bfd5740ab368989c1dd27f0bad4f7a6240. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644507 — a six-check JSON result.
Violin Sonata No. 3 in C Minor, Op. 45: II. Allegretto espressivo alla Romanza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5c5889bc02fa0f4114ea7ce210c3b18521b7605240cb7d22986b9d62efcb3d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644508 — a six-check JSON result.
Violin Sonata No. 3 in C Minor, Op. 45: III. Allegro animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d30fc76656b67b4debdfc814655e265856569902977d24b6dc9650bf9eb3d22. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199644509 — a six-check JSON result.