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 0x00bf7aa362a3092fd1a1967592ff0461e8e068f81fc93ef2a6d92981427f6c5c. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81c176a5-cf66-4897-9165-c206da17fb80.json and https://artists.proofprofile.net/proofs/artist/81c176a5-cf66-4897-9165-c206da17fb80.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Passages. Hidden Treasures of Classical Piano.
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 0xaf6883312acb34db51d8bb02e11d116912cf02ead9bfded39cbe9ec047fb2520. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEPI82319110.
11 Bagatelles, Op. 119: No. 1, Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe322ebfd20fc91606f09d04486adb3ed2f13c7ecab39b482bff110dbd8553c85. 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/DEPI82325411.
Dido & Aeneas (Arr. For Piano by Irene Cantos): Act III, Z. 626: X. Dido's Lament
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa908aff0f98d76cbb9a4dae805927ef9dff51ac16354486cb10d8082ddf15603. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DEPI82319111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506c97c64b44ff60b0fda7703338405834357b7f34b14abba40ac434558d6f4c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEPI82319112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908b16dd8a203f109317f494816e58e4d5cfa8dc0248c183193aa742189a43b3. 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/DEPI82323865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f123110843279713c5196b511d6234ea88a4bdbf9e0f0c037a1db2b0a93abad. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/DEPI82323863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a89f453216f7df07304db73fac6212e0b1d1d866eb305a25f7c1700e15efed. 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/DEPI82323864.
Haydn: Sonata in D, Hob.XVI:37: I. Allegro Con Brio - From Aeolian Piano Roll
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cfcf0225fa9a6c5dccaf1d3eaff23e86c0863c145781704d346a03cbc16e6a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEPI82304418.
Haydn: Sonata in D, Hob.XVI:37: II. Largo E Sostenuto - From Aeolian Piano Roll
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5844f86d8114c214846d8ab1c30a8aa9a7ad32fa91bcda95033b8ea18154e3cd. 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/DEPI82304419.
Haydn: Sonata in D, Hob.XVI:37: III. Finale. Presto Ma Non Troppo - From Aeolian Piano Roll
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4654039e8fac5d5589c90e0db70a677d8ed6839c310c15ca994a5a854073f2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82304420.
8 Pieces for Piano, Op. 72: No. 4, Danse Characteristique
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1915632e2370afd018275f6c053ff097dcb9253b37281835f5edf03540b6235. 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/DEPI82313922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73fbf7c533465d6dfe6d11097bd0bd33e86fe878f8a80edae2350ed07a20e9c. 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/DEPI82313923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67339ee772016e33a9a16866a5f67163e667abbdb44b4b75fe9fb8f09d0570bf. 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/DEPI82313924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb502678eb7cfc16df8a637c0ae20c96979ce8383ab916896e3e9ee9c6458e72. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/DEPI82314144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176927ae3dac27a579468c7081232fefbb1fe0756eef26c10824eaf9e0193ba6. 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/DEPI82319230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57595fad9e8e1a85f318b0e8f0648fae3c5bb7c3763701a68b0057ce23d80a5. 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/DEPI82319233.
Ramón Paús: Le Joie de Pierre-Auguste (Selection)
Le Joie de Pierre-Auguste: Moderato. Ragtime
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41135d2fdc4d19acea0a15456ab54f56b7f8da90522a64f926ae7fe8e8e627ab. 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/DEPI82321658.
Le Joie de Pierre-Auguste: Adagio. Como Cada Mañana Entre el Dolor y la Belleza...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf21e40fd5869618af6acbbb0ca074fdf354dd67aea24527ac56253dc744f7d. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DEPI82322155.
Le Joie de Pierre-Auguste: Andante. Astor in aeternam...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772e40e99d1d94bbff52b73e6c67fc6feed01fa4c01e9e958aa16daec9b2bc6c. 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/DEPI82322156.
Reminiscences. Hidden Treasures of Classical Piano
Well Tempered Clavier, Book I: Prelude No. 3 in C Sharp Major BWV 848
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c195998083331493997035d1ff719887ddddcfdd5044c4ff40bbc38575b885. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82400784.
11 Bagatelles, Op. 119: No. 9, Vivace Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d73f330cd5397f8c497a4b3d8869ed2cb8c6c46b28b765d0da2ca64fe9c9fc9. 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/DEPI82400785.
Die Ruinen Von Athen, Op. 113: Turkish March (Arr. Solo Piano by Rachmaninoff) - From A. 68771-H
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80b42b8535854137200e3c7efa8ca4d4feff42056a8fbd2ddf6b54765f442c5. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEPI82400032.
125 Miniatures. Hidden Treasures of Heritage Piano
Xàfec de Llum I Tenebres: I. Como Lluvia Fina
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d941aac1c0e2392754049145c609223944534a21b08e229a778832e7c3e70d9. 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/DEPI82450889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b22e76f61f11fef8a78403073ac888db662d6b00fee7ce1d9cfddcbf82c6d98. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82450890.
Xàfec de Llum I Tenebres: III. Quizás la Luz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2171b48107db8a9f33457dd1e8045897764413e8f2052ec937b6b20fec9e0a1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEPI82450891.
Xàfec de Llum I Tenebres: IV. Iridiscente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13731c37cb9cd7a41bf9b39a5df5763a7699a851aa6cc6bde144c43c51f45ab. 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/DEPI82450892.
Xàfec de Llum I Tenebres: V. Diario de Dudas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341579d89ad931fbe389194cc334d3503af484824a1805ef5f7f75c2132b17f0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEPI82450893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3491307e8b6a12d475d196a8a2844628b096f44ce4273953680ae95b03803b. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/DEPI82430556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241a9ea01920f1ce943b227e3674591a3fc78ee5311023aee229583a206b583e. 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/DEPI82412414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0703f90ac1654d15c4d324f48306d6c6137dfe06a6af4a40cc69856a5e78f25. 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/DEPI82412415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4bcc9516e34ef7f2f545ce498abe5d02338d1aee7d1d4f5b9167d10a7a2b5a. 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/DEPI82430555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64897437291fe26001d3794587f149c04ccf13f294c0bc98c3c52cd69ecef897. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/DEPI82412417.
Passages. Hidden Treasures of Classical Piano (Extended Edition)
Chromatic Fantasia. Piano Music of Bach, Debussy & Tchaikovsky