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 0x8c22f5a1344491fe601c9a6e9171b8ccaf3d6f3635f2208c31bd9e183ff27cd8. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f600d9f-1314-439d-a0c9-a514150a386a.json and https://artists.proofprofile.net/proofs/artist/5f600d9f-1314-439d-a0c9-a514150a386a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Boccherini: 3 Quartets for flute and strings, Op. 5 - Quintet in C major for flute, oboe and strings
Farkas: Chamber Music, Vol. 4 – Complete Works with Cello II
Farkas: Chamber Music, Vol. 3 – Works with Flute
Hubay: Viola Concerto, Op. 20 / Pieces for Viola and Piano
Stamitz, C.: Duos for Violin and Viola, Vol. 2
Divertimento in A Major, Op. 34, No. 1: I. Moderato
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 0x4bc0cb54aa45fb336f7ae78133d891a715441853c38d53aded8c5174aa28af17. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/HUA253245307.
Divertimento in D Major, Op. 34, No. 3: I. Poco allegrino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e03ac3378a1efa760247917cfe75fe331aded06ceaca2aa90fc7e0a2b0a371. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/HUA253245311.
Divertimento in C Major, Op. 34, No. 4: II. Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170da2db1825175d550fbfbee9c681677a7b4e65233868b03d407244a3cc19d7. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/HUA253245314.
Divertimento in G Major, Op. 34, No. 6: I. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256d951b23b5991a5528eec1b99ffdbb2adfa717f10ea456c25f79272389b618. 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/HUA253245317.
Stamitz, C.: Duos for Violin and Viola, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e24389bab46763dbe36b1336117ad66c7a56c30dda4f85bc145572309d41f9. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/HUA253228201.
Duo in C Major, Op. 19, No. 1: I. Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93dda8a86945290fad600256c968eb76eaa79111900a598a53b70e6fe01ecbb. 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/HUA253228203.
Duo in C Major, Op. 19, No. 1: II. Minuetto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4269abda9be6289943c32d565bfbeec7eafea4db82c63040d38f5530858421a. 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/HUA253228204.
Duo in C Major, Op. 19, No. 1: III. Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6232937511a9c10576148dc1d03f87bf58b0b86cfe400c58c88aeeeef5f7aee. 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/HUA253228205.
Duo in D Major, Op. 19, No. 2: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92069687566fed17617ba0ef71d6f82b42d489f969d888171515ce6d74ba9a5a. 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/HUA253228206.
Duo in D Major, Op. 19, No. 2: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269f7bc5560e3433a78002c916b378fd2e7ff2f64410533b8e1659e1946ddd0d. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA253228207.
Partos: Viola Concerto No. 1 / Violin Concerto / Shiluvim (Fusions)
Viola Concerto No. 1, "Song of Praise": II. Epilogue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30dde6293643f1df5916d24a38656d1d1d11302f1afbbadb9436408e97d4e35. 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/HUA253245012.
Weiner, L.: Duo for Violin and Viola / Budai, P.: Doll Doctor / Justus, G.: Jazz Suite / Kuti, S.: Serenade / Sonata for Violin Solo
FERNE STIMMEN – LIGETI Sonata for Viola Solo; KURTÁG, SCHUMANN, BRAHMS Chamber Works
The Brahms Project: Viola Sonatas & Songs
Giordani, T.: Flute Trios, Op. 12, Nos. 1-6
Flute Trio in D Major, Op. 12, No. 1: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5e2fed7f2f90a9fb2cec85634498e89f08974a6279b5e91f87d8a9a7d338a8. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/HUA253249802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256d951b23b5991a5528eec1b99ffdbb2adfa717f10ea456c25f79272389b618. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA253245317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e03ac3378a1efa760247917cfe75fe331aded06ceaca2aa90fc7e0a2b0a371. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HUA253245311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc0cb54aa45fb336f7ae78133d891a715441853c38d53aded8c5174aa28af17. 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/HUA253245307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4269abda9be6289943c32d565bfbeec7eafea4db82c63040d38f5530858421a. 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/HUA253228204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93dda8a86945290fad600256c968eb76eaa79111900a598a53b70e6fe01ecbb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HUA253228203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170da2db1825175d550fbfbee9c681677a7b4e65233868b03d407244a3cc19d7. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/HUA253245314.