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 0xa1c5dd457f0a44062b9a20ec793767d1d2fe49e637eb73d2ef326d2d1a1ecfcf. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ad252bb-4e31-4aaa-bda7-cd65d094a66b.json and https://artists.proofprofile.net/proofs/artist/8ad252bb-4e31-4aaa-bda7-cd65d094a66b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Soothing Guitar for Baby Sleep - Piano Version
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 0xcc5b25ab60ae4bc61a76e28f1e91de5b752d5c57199f9ea930a13d00726b7e55. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/ITK261900012 — a six-check JSON result.
Baby Lullaby: Classic Romantic Piano Lullabies for Deep Sleep with Ocean Sounds
Mozart Baby Lullaby: Classical Music for Babies Sleep, Music Box Lullabies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a861c5fcf03c47133fb25be7992afbe32c126ca3aa8dfe9a4fd8faa8f3e6cec. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ITK262000347 — a six-check JSON result.
Piano Sonate in A Major KV 331 Andante Grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc19dc147ff0d7cede9db482d8717529387803fd7136dc3c049977087b7d78c9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITK262000348 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc952be09e6777a7c924368f9a9382a4c41712403000096919a982fa273748277. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK262000349 — a six-check JSON result.
Piano Sonate in C Major KV 330 II movement Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42782a7ac4160c9931ac987859d95adaf6d64a1aafeb5ab2e19c6bf1a3538cc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITK262000350 — a six-check JSON result.
Piano Sonate in D Major KV 284 II movement Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb080a6a78e43f4bd4b39dcfe556ad5289f143fe9a79c33a9ef7451e3508eb7cb. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITK262000351 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb977f8663868589b1fff4f048b09391d12e0c2ece86d5b97b57edf0d7c26f6bb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITK262000352 — a six-check JSON result.
Piano Sonate in B flat Major KV 333 I movement Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb7f4406e1535ac8846c29d1f11d18aa254502e06a1368c310f931c2ab06dcf. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/ITK262000353 — a six-check JSON result.
Piano Sonate in B flat Major KV 333 III movement Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a1adaed641cbf25ccfcfecab749ec3dffcf6c9722475d6411455db080260bb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITK262000354 — a six-check JSON result.
V Viennese Sonatinas in F major III movement Polonaise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6a4b9b54601fa67f6eacd93d44f79aede5a8ba58257b7d29cd4768b4564ab3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK262000355 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bce1c06d8f29b8b3ff37f32bbf59f24eec99defe8be527ecbaf9d3467ab86a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITK262000356 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8767bf4b166025d0a6be1269f685c7da8283e81e211dceb8be61493d127f3c72. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/ITK262000357 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13627bb7ba8fca53a75f59406c84ee456aaa528bd9cbf77e601e1dfdbd334c76. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITK262000358 — a six-check JSON result.
Piano Sonata in B flat Major KV 333 III Movement Rondò
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499fe079b8258d4bb05d2d2488f428881595cbea95df7adfadccee38a64dea36. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITK262000359 — a six-check JSON result.
Calming Piano Music & Ocean Waves for Baby Sleep
Soothing Lullaby for Sleeping Baby - Nature Sounds Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06201b3f0167c7481524a2d68309863b42d16f7263900318260106dec895eadf. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK262300639 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2756582cf669cb539f10e33bc6be8b2fffaaae7e114cc700c65e81bfadb4a6. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/ITK262300641 — a six-check JSON result.