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 0xf20650a621816008e8dd494eabae6acc01453908164526071456dee208b8101d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b07cee75-b5aa-40ba-a4c1-679ba99129a6.json and https://artists.proofprofile.net/proofs/artist/b07cee75-b5aa-40ba-a4c1-679ba99129a6.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Church Sonata in E-Flat Major, K. 67/41h
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 0x494ffa2bae92bf200a9854c59f401ffbf66c2b24805b6b539dd7ae54ff808ae4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOEHX2306010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b890a07fef1e9bff25b97713d5ae85bf75de510ba4dbc35f3eec7931bd815c9. 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/NOEHX2306130 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616c84b640184cca13b1e391dda8f7b57df45303485f4417bf84199231a4b6f8. 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/NOEHX2306140 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973e903f7e335fd519deb0c7426527059c2e9385ae5a30dc0049c954088a84d7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOEHX2306200 — a six-check JSON result.
W.A. Mozart: Concerto for Flute, Harp and Orchestra & Sinfonia Concertante for Four Winds
Bartók: Violin Sonata No. 2; Contrasts; Solo Violin Sonata
Contrasts for Violin, Clarinet & Piano, BB116 (Sz.111): 1. Verbunkos. Moderato, ben ritmato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf445f59ee082d91be6b4ed8b18a096464e2bedf4f15421990fb539cd6e50bbf4. 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/GBF079310641 — a six-check JSON result.
Schumann: Piano Quintet, Op. 44 / Piano Quartet, Op. 47
Piano Quintet, Op. 44: I. Allegro brillante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0b3af8afe05670b66ab0c70c73e9db4aba574ccf39a4bb660a65dc423e0f1f. 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/NOEHX1920010 — a six-check JSON result.
Piano Quintet, Op. 44: II. In modo d'una Marcia. Un poco largamente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0a46e93bfca56b1d8c4376d237c6f27ea0691104d5ceeac437d97d6bb83657. 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/NOEHX1920020 — a six-check JSON result.
Piano Quintet, Op. 44: III. Scherzo. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce96ea020543cd34436bedb8f57a17233f3e2ff7261b2254e9da2bb385e3b8d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOEHX1920030 — a six-check JSON result.
Piano Quintet, Op. 44: IV. Finale. Allegro, ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b13cdc75de082622063e7e0a133da9f39881d22189c27bc832b98dc37f6f4aa. 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/NOEHX1920040 — a six-check JSON result.
Piano Quartet, Op. 47: I. Sostenuto assai. Allegro, ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba7ad56fc37f71c6643b2fb5f547b1e462f92755cff232ecba1bd53b80c2ba0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOEHX1920050 — a six-check JSON result.
Piano Quartet, Op. 47: II. Scherzo. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2588182349699a35ebd1b727d612ec2552fc6daaa54fc0050625d530d9c22d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOEHX1920060 — a six-check JSON result.
Piano Quartet, Op. 47: III. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddb4e996887abde7b21d4c364865c30d2ef47e1ab3112e7a5d851b8123f7751. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NOEHX1920070 — a six-check JSON result.
Mozart: String Quartets - Dedicated to Haydn - K. 421, K. 428, K. 465
Mozart: Oboe Quartet in F Major, K. 370/368b: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d1f10d22cadbf555269fa88e3a85bc6f4ac554b95c54f76d91cb140319948f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOEHX1605020 — a six-check JSON result.
To the Brother Peoples (Music by Lasse Thoresen)
Rosen - Tonestykker i klassisk stil av Per Bolstad
Schumann Violin Sonatas, Op. 105 & Op. 121
Mozart, W.A.: Cassations, K. 63 and 99 / Adagio and Fugue, K. 546