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 0x4a242eef31b634cf9efb73f98c726824da960437bf7054571d2cef4f5db7e085. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b928984c-116d-42c5-8d93-5e2ce68d3dfb.json and https://artists.proofprofile.net/proofs/artist/b928984c-116d-42c5-8d93-5e2ce68d3dfb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Piano Trio No. 3 in C Minor, Op. 1, No. 3: I. Allegro con brio
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 0x7dbf3d2455468c01ef6079ebfae7abc253cbe20a9e5a3b5e439aa5f38bcc2a41. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903651 — a six-check JSON result.
Piano Trio in E-Flat Major, Op. 70 No. 2: I. Poco sostenuto - Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bd9ddf871d174cb16d3ab99260c27586dc360c78e22841213be6c081fb5c82. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001161 — a six-check JSON result.
Trio for Piano, Violin & Violoncello in E-Flat Major, WoO 38: 1. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89e0710a5891a8e53b232a92391ddd021f72a351a6b26248d83d2b864b40436. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903681 — a six-check JSON result.
Piano Trio in E-Flat, Op. 38, after the Septet Op. 20: 1. Adagio - Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04972c3436c04d1845a6e98371e305c5f3e0508ebfd6548bc344d3ffabfc9276. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507902039 — a six-check JSON result.
Piano Trio No. 1 in E-Flat Major, Op. 1, No. 1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333a07d7bd2447cfc0b2c5249396043b0f970962280b4ef29d3c28aede352e63. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEF056903631 — a six-check JSON result.
Piano Trio No. 3 in C Minor, Op. 1, No. 3: II. Andante cantabile con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5707f25e931bb6732c01a41aef76b8f2c2b567bf853df7204aff75bc6ff5768. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903652 — a six-check JSON result.
Piano Trio in E-Flat Major, Op. 70 No. 2: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9518b5f0d88d9e220af38474c7d250775bdd522402f34160e6bb70ad8a2cb372. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001163 — a six-check JSON result.
Piano Trio in E-Flat, Op. 38, after the Septet Op. 20: 2. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4883d917c20c020142604544c8c4902dabc739b910ad60930c7af593970751d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507902040 — a six-check JSON result.
Piano Trio No. 1 in E-Flat Major, Op. 1, No. 1: II. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4bcccdb2b786aa403122d6b190a2d1e96995d3e58da8a0e8520bd62e2f3a03. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903632 — a six-check JSON result.
Piano Trio No. 3 in C Minor, Op. 1, No. 3: III. Menuetto - Quasi allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25117abc6728ac24ef11d7ada715d805afd78ce67c51dcbb34c3785cc41758e. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/DEF056903653 — a six-check JSON result.
Piano Trio in E-Flat Major, Op. 70 No. 2: III. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7065869bca739e475289568292df5eed45f33ed8a9509f5044f45b2dcfe8fa6d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001162 — a six-check JSON result.
Piano Trio No. 1 in E-Flat Major, Op. 1, No. 1: III. Scherzo - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d134d17d427ec2a77019cca0a79bbc6ef8beea087bbc914c063421508465c5c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903633 — a six-check JSON result.
Piano Trio No. 3 in C Minor, Op. 1, No. 3: IV. Finale - Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb941257210f029d27e72e0692d370b5789a832f212cab584f0cbce7b4c7b5636. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903654 — a six-check JSON result.
Piano Trio in E-Flat Major, Op. 70 No. 2: IV. Finale - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313bbeea8eebed743c80c9c357760acb6131293dc5555261e19d81f5f45b6f2c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001164 — a six-check JSON result.
Piano Trio Movement in E-Flat Major, Hesse 48
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d8d7c8eaad43e15a800d7d65290054ca8a20625b0e885d538f00280914a975. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507902045 — a six-check JSON result.
Piano Trio No. 1 in E-Flat Major, Op. 1, No. 1: IV. Finale - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad667da50095754c6ec23a4ff51e95e83685c81aac7d70c43e05d6a2f9cd7091. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903634 — a six-check JSON result.
Piano Trio No. 5 In D, Op. 70 No. 1 - "Geistertrio": I. Allegro vivace e con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131034bbf985d74b60be564677d35c8bf1bc62717a37feef987d113e7e9ad9eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001151 — a six-check JSON result.
Piano Trio No. 7 in B Flat, Op. 97 "Archduke": I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25d028c3140ab457ea368fa2126be11a6fa232be4394cfc81cbf45e404dedad. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001181 — a six-check JSON result.
Piano Trio No. 2 in G Major, Op. 1, No. 2: I. Adagio - Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2631d0f407443675ab41a05fea000105da7212993fb71463f5796db951be2e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903641 — a six-check JSON result.
Piano Trio No. 5 In D, Op. 70 No. 1 - "Geistertrio": II. Largo assai ed espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc553676d40f3aa89f81fee766a95a767ce7ecd64d2d33cc8daa045a8de2424f0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001152 — a six-check JSON result.
Piano Trio No. 7 in B Flat, Op. 97 "Archduke": II. Scherzo - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffe26f1fe086df2ed73fab3e291d16b096d5c91d9b28d3fbbd07d3dd1db7da0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001182 — a six-check JSON result.
Piano Trio No. 2 in G Major, Op. 1, No. 2: II. Largo con espressione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bf1a5b189f3b7c55f1cfbb015ff0373647af5d53eefb91c04b65514f96d651. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903642 — a six-check JSON result.
Piano Trio No. 5 In D, Op. 70 No. 1 - "Geistertrio": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb81c2b11f1e37fe73f874992c21ec02157466e0295106fb14997f609b3a78f5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001153 — a six-check JSON result.
Piano Trio No. 7 in B Flat, Op. 97 "Archduke": III. Andante cantabile, ma però con moto - Poco più adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96e42d18516bf2c004ff162744c8074451a8fcd725ed312ca90b21f931f9695. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001183 — a six-check JSON result.
Piano Trio No. 2 in G Major, Op. 1, No. 2: III. Scherzo - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4172a3f15303936143605f030bce9e4785ca43f182419f38cae85d7393e04e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056903643 — a six-check JSON result.
Piano Trio No. 7 in B Flat, Op. 97 "Archduke": IV. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa90224c09d214841c03caaf02eda3121f37e988e0a9a957ea6b12b4e9d0a24b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057001184 — a six-check JSON result.