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 0xf58b946640a6ba142e7c51f80d3d6cbcf90041638681db5ed543a7b7b06cf254. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d8c383d-3aa3-4213-9f95-b8fe9fc4e2ee.json and https://artists.proofprofile.net/proofs/artist/6d8c383d-3aa3-4213-9f95-b8fe9fc4e2ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Takacs: Miniatures / Piano Concerto / Chant of the Creation
Piano Music For Students: Associated Board Piano Examination, Grades 1-4
20th Century Foxtrots, Vol. 1: Austria & Czechia
The 5 Wishes Suite (Version for Solo Piano): II. L'heure bleue, Boston
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 0x14cafbd148c4b67e2f078917396cc2e72a5172988f675af002396ef5c0d716bc. 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/HKI191953907.
Takacs: Postcard Greetings / American Rhapsody / Serenade / Passacaglia
Philippine Island Miniatures, Op. 34: VI. Lullaby (Tagalog Province)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb977a32609f00e99e6c61062aaadb0840c52189e3892f9558493ce0fdd96dd64. 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/ATG300779323.
Farkas, F.: Aria E Rondo All'Ungherese / Ranki, G.: Don Quijote and Dulcinea / Hidas, F.: Oboe Concerto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6680bc7597dc610cafafe5259097f50f42559a010fd062488591030b6f983f. 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/DEB260100063.
Epigrammak (Epigrams) (arr. L. Lencses): No. 1. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd926cc9122ee0215f5df3cdfbd29f2f9680d3e0f5961ca48ea923f673d5e6e4c. 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/DEB260100065.
Epigrammak (Epigrams) (arr. L. Lencses): No. 2. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99a88f7e6d9fed1b61e5bf88ff8d49ac3f371b0e348742fedda06f218652ac1. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEB260100066.
Epigrammak (Epigrams) (arr. L. Lencses): No. 3. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa59e6401c4863fd35e635709eb02d4976450618193952274e5057a6872d953e. 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/DEB260100067.
Epigrammak (Epigrams) (arr. L. Lencses): No. 4. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557b8221e88d60b96fa628e56b0a2a8d8f8cf0ac2f04b83c42d44656dab035c0. 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/DEB260100068.
Epigrammak (Epigrams) (arr. L. Lencses): No. 5. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d777829215f965a17d5d7135c9bf1e5f4b37a98bb08b0ed6ca7cf2b87f1102b. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEB260100069.
Epigrammak (Epigrams) (arr. L. Lencses): No. 6. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe592495ded6a068e6063389a85ba2af11568f0eeb966f0195f08bbf05232cfa. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DEB260100070.
Epigrammak (Epigrams) (arr. L. Lencses): No. 7. Con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b9e248c7799e991ef4a6a20f83e6bde757ecdb63b17e4ee4127213f10c8766. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB260100071.
Epigrammak (Epigrams) (arr. L. Lencses): No. 8. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53027e4c39eddf6fea1237679a613082446a194acea1834ec33cc1b99c9bdb21. 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/DEB260100072.
Epigrammak (Epigrams) (arr. L. Lencses): No. 9. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aac58ac5e223af3aa8bd8261085e07c8b5a160646b5e17feaa35c1e5a3e1c3. 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/DEB260100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e0de3dafdafb391176b66a1477ce0b993de201d9faf7cc898e5b5e9e8153ff. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB260100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981911000763dee531170d7c0f26909bf37dc15c103bc83eb368733033ff9204. 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/DEB260100077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196901dd7a97535f0e160092738db9025f091c7f752850a773fcb5427e40c2d4. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DEB260100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfece361ef20d027d322341dd1c9e74603d71d478abe1e0341a3a310de9879c39. 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/DEB260100079.
Haydn, Mozart, Danzi, Farkas & Takács: Wind Quintets
Divertimento in B-flat Major, Hob.II:46: I. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1acc51aab1ffa92aed57c392e1f30e670187db9cf04dc7a1e8f11327a9ac9b. 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/GBAJU9600002.
5 Studies for Piano, Anh. 1a/1: No. 5, Chaconne by J.S. Bach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447db46dcc24c43560d605027fc1fcbac9ab863d3ea40455697fcb4ed74092e0. 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/USSM19200814.
Etude for the Left Hand in A-Flat Major, Op. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bc36f4fcb638a74f07d5e823ef7907b63d49ba89e275ed21509e38d4f49acf. 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/USSM19200815.
Prelude and Nocturne for the Left Hand, Op. 9: No. 2, Nocturne in D-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb801edb13c84dc98da7dea981ec6e4c0bdb497ff5b470eac358abd196cecc9a7. 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/USSM19200817.
A Hungaroton-hangverseny díjnyertesei 2000
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da884d4d3b427de29b655031c32d624e37b047768913eb7e4d9e60be4f07f76. 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/HUA251945211.
ヒンデミット＆ピルス トランペット・ソナタ集