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 0xaf6ec48915413d28d5743d3dceb1c2dbae3df39518b94dac336e13c05b8269d4. Chain 2 (Bitcoin): anchored in block 953689 (2026-06-14T20:27:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69d48fc1-882d-4e28-afa9-b66a27c793a7.json and https://artists.proofprofile.net/proofs/artist/69d48fc1-882d-4e28-afa9-b66a27c793a7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
D. Scarlatti: Complete Keyboard Sonatas, Vol. 27
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 0x1c4f2dd06608e6a0575df033ae3a1ec30bdfee8b6a3e8f245dfa5b028146fa35. 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/HKI192240804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0115dca4af8fbd0c3211f360404f76d81901e30ab7986f8da2bc32ae0a923d5c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HKI192240809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1e10eeffab0d7e3f954cbfdd746893772781b70426f8828c97eb3acd34c81f. 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/HKI192240814.
The Key Collection: 3 Centuries of Rare Keyboard Gems
Studio per il pianoforte, Book 1, Op. 30: No. 26 in G-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f9e0c34e022aeaa33e30772c4ca402ecf5543b79c099b0230f2f4c370bb4bd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191201226.
Liszt to Milhaud: A Journey with Piano 4 Hands
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d179e90905751c8aa3d89928a93434d07a98be91bebb24f69696c81f1b7b31e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI191935127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b9cce89e0c31de4f92a2eeaa8140b6e40a1ec5a83fb68d77332f75a90d8c55. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/HKI191424201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006d26a64fa048b2945dd483c51ce7b4a2afcfad33dd9c500a25ce6afa7c9513. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191424202.
10 Pieces, Op. 13: No. 2. Etude, "La Gondola"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4881be348544d906d82394533fc536e5d5fc5173fbca74f4bf30e7fe7406d7ce. 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/HKI191424203.
2 Nocturnes, Op. 6: No. 1. Schmerz im Gluck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66cd743fcfbb22016f59807cc67178551e5dbeff2aec6a79b7b0d18c0e7bbb23. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191424204.
12 Études caractéristiques, Op. 2: No. 6 in F-Sharp Major, "Si oiseau j'etais, a toi je volerais!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63dbd38093ffb4fbd135351d707913b7b01769d2c117b7594709e40501a8ca8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI191424205.
12 Études caractéristiques, Op. 2: No. 3 in B Minor, "Exauce mes voeux!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7550c7c0223290216a9e8b0ee2ab18cd97f119a320c254ed06199b355af4bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191424206.
12 Études caractéristiques, Op. 2: No. 4 in B-Flat Major, "Repos d'amour"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a03389a4498e4ebef023693f74c9c28d5e3790224bf16e55c109b60c808139f. 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/HKI191424207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383cbb2ad073476a8248a293c3819598afb27d941408ba10a515edc58b8ace3b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191424208.
2 Petites valses, Op. 28: No. 1 in F Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1f3d44271cc74c79306378e387e2842e8fa8d285ef069c6990cc5116a4bd80. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191424209.
2 Petites valses, Op. 28: No. 2 in C Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af86a322c2c11d2c4e93939b7f8c888990c94047c2568301884b5238a7baaf9. 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/HKI191424210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca7a2dd7555632aa770077a63cd87ba4969769ddd2748fc8703edb21a404440. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HKI191424211.
6 Romances Russes: No. 6 in D Minor (after Dargomizhsky)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88de70e38211d38e7edc4fc8661305214c5522e91271cf65426dbedab059055e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI191424212.
12 Études de salon, Op. 5: No. 3 in A Minor, "Hexentanz"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf770e92cc994828eb246f3aece98ef32bc46a542b72fbb52a7ee86fa50488b0e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKI191424213.
12 Études de salon, Op. 5: No. 9 in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e815af6cdafdb0610355b45919ec2a408444053d8b87b09ccadbb3de47267b8. 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/HKI191424214.
12 Études caractéristiques, Op. 2: 12 Etudes Caracteristiques, Op. 2: No. 2 in D-Flat Major, "Pensez un peu a moi, qui pense toujours a vous!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ea6fcdcec55c3a6493d48b11c13f44984dec3fb8166d2c92a7c7175b7f7767. 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/HKI191424215.
12 Études de salon, Op. 5: 12 Etudes de Salon, Op. 5: No. 6 in A-Flat Major, "Danklied nach Sturm"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c7b9b18a727b6858e42471a17a4ba60d4ccbb38eaffc3c4289796afd7a8b64. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKI191424216.
Erinnerung und Freundschaft, Op. 4: No. 1. Rhapsodie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c048e06167f4f389f932379a35a8350c592ba4d25978f45b0afb828b34bdbc. 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/HKI191424217.
Aufforderung zum Tanze (Invitation to the Dance), Op. 65, J. 260 (arr. A. von Henselt for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c56ed9a9e1b92aa0ed749e2994780f6542910196d68055644995f372e11faa. 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/HKI191424218.
Liszt Complete Piano Music, Vol. 40: Transcriptions from Operas by Meyerbeer
Réminiscences de Robert le diable, S. 413
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b85fbbe8b537d0f5c0688ba2f6ec194ba219acf3288832a27b46eb9b0d37a83. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191424105.
Poetic Fantasies: Liszt's Transcriptions & Monuments
Celebrate Beethoven: Rarities & World Premieres
Signor Abate!, WoO 178 (Arr. T. Holmes for Choir & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf21b174c191e1fa9e5272e459e74bb7264c2fa7157af6a12e92db04f12044e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKI191938021.
Great Composers in Words & Music: Ludwig van Beethoven
Fantaisie romantique sur deux mélodies suisses, S. 157
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8547052c1711bcd6f429a3b7558e59016c198e33d1b29367581935c5909ebe. 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/HKI192413601.
Paralipomènes á la Divina Commedia, S. 158a "Fantaisie symphonique"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0d97c19c891604244d9d35e59b7af08d16ebfedcb0990ca6e1d5c8bae844ac. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKI192413602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f390d37c3e4743805997c4f5403fe47f8295657cb931051ff0ee73010550b7. 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/HKI192413603.
Den Schutz-Engeln, S. 162a/1 (First Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edde4f4023b74c28aa902623e10ab36e72fc4471763ff999287db41d6637c07. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192413604.
Den Schutz-Engeln, S. 162a/1 (Second Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b86111a2b09942b92d6fdb48969129ff3a3fb3a81fe2ef160f978b45ae7c2c6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192413605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cf1a647bd8f932250c2307e31d1db4aee8becc4aaa2ba99849a3ecdafd7426. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192413606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b972c855d7149791a4e8cb45e492094df320f4040eb1a3d5befc5bdf3009b5. 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/HKI192413607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e426f46afc315f4d04387d50fd91251632578a5efac36df066a0d9426508449. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192413608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18225b496fafa65dffc0f38d0a3931875ae5a9f4ad06ccde72f0ac3e99d5dd3c. 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/HKI192413609.