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 0x8f93aefbd5f49b1555380a13ea4464cd7c5feb61a5006e8582848bc946515230. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8913f93-8cf8-4489-a65e-77be110f15c8.json and https://artists.proofprofile.net/proofs/artist/d8913f93-8cf8-4489-a65e-77be110f15c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clarinet Sonata in E-Flat Major, MWV Q15: I. Adagio - Allegro 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 0x2ab2b56268483c55c7ef8d1484cf63697081644eb73751368ad713ab81969cbc. 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/ATMA40501436.
Clarinet Sonata in E-Flat Major, MWV Q15: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a81001ca9a24278e231b2162484d18916fd123eecfdcd07718fe7abc1e194a9. 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/ATMA40501437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49afb93f4c73c8b0960f09876a0e97f15ede756f5b86224222f8ffaedfad860. 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/ATMA40501439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ede20679752192e9338753b8c2aefdd9298053a3925401e9de53370165d4f1f. 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/ATMA40501440.
Sonata in B-Flat Major: II. Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08657fc0e63c2819c2c447732fc9e781abfd44fb11403523100c299a95d55bd. 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/ATMA40501441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db50461f64f480cf572acfe167601cbfb7b39df16a5d1090183d8b65d7cc71f. 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/ATMA40501442.
Fantasy for Clarinet and Piano in G Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129e733c7dedb0922946f3a7e542e5b0b0c529e89f297c066c40f1fb739a9f65. 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/ATMA40501443.
Introduction, Theme and Variations in C Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa115ba0dd3f88cff407fd2a9e4ecc59b0b1183b842ac870da5271105b51900b3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ATMA40501444.
Trio for Piano, Clarinet and Violoncello, Op. 114: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114d2aad026f8f35fbd9f9d76f137c467a2075e78e60a9d2544859615a5e637d. 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/GBAJU9700660.
Trio for Piano, Clarinet and Violoncello, Op. 114: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582d2b78870360986091f3bc134d4e8cde19f49a253533d81d504f80b555931d. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBAJU9700661.
Trio for Piano, Clarinet and Violoncello, Op. 114: III. Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06778396e50a67e07f337b024b53692c748d4828dd734790340cabe1757a28a2. 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/GBAJU9700662.
Jean Francaix: Quatuor - Trio & Divertissement
Thème et variations pour clarinette et piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cbc4edda360d09920638a5b4516432a72e71c9994ee9e8d4f53fbc14ca9457. 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/ATMA40501366.
Rigoletto-Fantasy pour 2 flûtes et piano, Op. 38
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17156bdf26031eb801239016c00eb8bab17576e65b8fdb5d54bb70488ea5c959. 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/ATMA40510605.
Souvenir de Prague sur des motifs Bohemiens pour 2 flûtes et piano, Op. 24
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4f6ee681de81282b360c212455de631a09c932f5dd9f1cc866b99da94deb15. 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/ATMA40510606.
Fantaisie pastorale Hongroise pour flute et piano, Op. 26
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b68cb9d85d985c84402ea37634532e4f88f9aed7400ed866ed38f62dcf66c4. 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/ATMA40510607.
Andante et rondo, Op. 25: No. 1, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1e178ec2c0cecc71e58d8f818bfda6d9cb3814a02f7461a671111c56dad7b6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ATMA40510609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340bc6bae7e9a3755d82646ae8af8a1b0672e6a93dec920239a2fa7facbc1acf. 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/ATMA40510610.
Duettino sur des motifs Hongrois, Op. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615fb86ad1e7eddfeeef831b643eef77139eb972e443063c6dcb8f840969fc6a. 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/ATMA40510611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8ba48bae04a38fbd082743febccb5c5d61ea54b131a8ad9ee26f770b49f0fb. 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/NLY330904850.
ヒンデミット:木管楽器のためのソナタ集
コダーイ、ゴルトマルク、R. シュトラウス:チェロ・ソナタ
ウェーバー、フンメル、メンデルスゾーン:フルート三重奏曲集
Bartók: Mikrokosmos (Works for Piano Solo, Vol. 2)
Mikrokosmos, Book 2, Sz.107: No. 40, In Yugoslav Style
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04493959b84caa6f9468a784dabd34f009bdf19dd0fb98cb4126a1d3f8da1c3. 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/ATMA40503874.
Mikrokosmos, Book 2, Sz.107: No. 53, In Transylavian Style
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4403da70d44ce375887c71c029c7c798abcb01a543e4efa0391ff46d81797cb7. 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/ATMA40503878.
Mikrokosmos, Book 5, Sz.107: No. 123, Staccato and Legato a, b
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2efa3163cf961a79960b882d4abd294f1634e612a103131a2309d08ff32a5d5. 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/ATMA40503907.
Mikrokosmos, Book 5, Sz.107: No. 125, Boating
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c8f4cf87fdb2ed0dc651e701fedc39946c042c7e3a682d78c253d54a025802. 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/ATMA40503909.
Mikrokosmos, Book 5, Sz.107: No. 126, Change of Time
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6505d4c95ab1db9c8cef2d28d54346065596c41fd59ae4f123b335a6cde3c4ce. 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/ATMA40503910.
Bártok: 14 Bagatelles (Works for Piano Solo, Vol. 1)
Sonatina, Sz. 55: I. Dudások. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d299f2ae40d0f418a72984e34af562b1d213dc106d85687d71defc2f548219. 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/ATMA40503832.
14 Bagatelles, Op. 6, Sz. 38: No. 1, Molto sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61215390c07b9cce21e8930e401ba3241e8973b7e0fa3d6168c5eea0dca26a2. 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/ATMA40503841.
14 Bagatelles, Op. 6, Sz. 38: No. 2, Allegro ciocoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225f9af779d394bbd00123f7da897175d28c69cea6a7e9001717347cc3f791ae. 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/ATMA40503842.
14 Bagatelles, Op. 6, Sz. 38: No. 3, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48cb44ae69d9e897b504459e88c477fc5e53980c9b869983b830f5b13e5af6e. 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/ATMA40503843.
14 Bagatelles, Op. 6, Sz. 38: No. 4, Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde8ba2ccd3668fefd2458fa9cf7be2646f6b50a147a9003cb3b03b175378e04. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/ATMA40503844.
14 Bagatelles, Op. 6, Sz. 38: No. 5, Vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dd8e2ebc2a18ed7647bde041ddf13ec8b813043bed9925ca268dd902c3e636. 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/ATMA40503845.
14 Bagatelles, Op. 6, Sz. 38: No. 6, Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede75ef5822a4a530a33ed4d5e925e3de2204f46861d7783835930ea42441041. 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/ATMA40503846.
14 Bagatelles, Op. 6, Sz. 38: No. 7, Allegretto molto capriccioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62a72110ae1e71aef3ac40a8cb721383d9ac3f290ffd77b0900ebd3fe34a990. 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/ATMA40503847.
14 Bagatelles, Op. 6, Sz. 38: No. 8, Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cfb8859558a459a72e920a834fe7a05fecef2b5c2460d01a73d5f8296e0d72. 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/ATMA40503848.
Top Chors, Vol. 4 (Concert commemorativ Hans Erni / Duri Sialm)