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 0xda72c915c4616fd8cdf0a184c3b2f917fa77b4ea46b18fd21029fd55679ef830. 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/2dda66e8-a714-42a7-b2b6-4d57c8a6f2c1.json and https://artists.proofprofile.net/proofs/artist/2dda66e8-a714-42a7-b2b6-4d57c8a6f2c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kirchner, T.: Piano Quartet, Op. 84 / Schumann, R.: Piano Quartet, Op. 47
Suk, J.: Piano Quartet, Op. 1 / Faure, G.: Piano Quartet No. 2
Little Red Riding Hood and the Wolf, Op. 39/6 (Arr. By Dirk Mommertz)
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 0x5620a260ed79030449bb99a81f7e004997305d6c6dab17e87ab86f1c2654de96. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES381816000.
Suite bergamasque: No. 3, Clair De Lune - Arr. by Matthias Kaufmann
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1d93981c7445f9b73b5dce096995094931633d0446e1d3b0a6d2d3f44f88c1. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382340004.
Piano Quartet No. 2, Op. 2: III. Intermezzo. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec0da8ec4023ccbcfc37a2016778ce92b4abdb02bd12be87bbfa31b10a81625. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUM70906117.
Klavierquartett in C-Moll Op. 13: I. Allegro
Strauss & Mahler - Piano Quartets & Lieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5056a82b7ea174ae7e65979e991d2c9c153eb0b3fcc3d93d2ef0fea9c3923af. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USSM11400467.
Klavierquartett in C-Moll Op. 13: II. Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa563925d77c6ed4d262c5546e70c2f15f051c03be54bdacefef4dffd052f6496. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM11400468.
Klavierquartett in C-Moll Op. 13: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16c5d10a581e7a1afdc060dd039850a9eaa43d59b70aaf5b1662989a9db5a5f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USSM11400469.
Klavierquartett in C-Moll Op. 13: IV. Finale - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503d30faf28073d33741ef36cd6d0bf5f708f55d2c4915d1273c8e11382212ec. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USSM11400470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acef7d097bc84cad6e21d317f53a980eee95cae63c7a950593b68315317701b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USSM11400471.
The Sound Of Yellow Lounge - Classical Music Mixed By DJ Clé
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6531fad1032f8fd8f328fddc67c21f6077c994a8835575e11cd9b764b999446a. 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/DEN961205610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563366bbe11aeed9d1de97bad7d7abd10bcc05e6c4654858cc13820d2d170c32. 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/DEUM71204454.