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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07d1fc8a16229d3845ed31a32b0fe46ff287d15589dbfb3d9126e7ced9b6692. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d99dcf0-6036-4d6d-abec-03570157b0e1.json and https://artists.proofprofile.net/proofs/artist/4d99dcf0-6036-4d6d-abec-03570157b0e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sinfonia concertante in E-Flat Major, K.297b: I. Allegro
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d47ad21f0f72240225c5fd10bc8731b542b0fe1ba8dd18168a8dc312d1c424. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2293705.
Cuban Dances for Solo Horn, Strings and Percussion: No. 1, Tamarindo Scherz-son
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cf6d69a965055f3b6b74c97aec4b67e24a06881aaf505f1110e4bc22ff3291. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FR50X2287804.
Horn Concerto No. 1 in D Major, K. 412/386b: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58815ab6a145be0fc6d5325a5e32e2a40a732dfa171bedbf64eda80151e6a2a. 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/FR50X2287810.
El Bodeguero (Arr. for Horn and Orchestra by Jorge Aragón)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3588389fb8e8f1d9be31c23c4eeae9d44c57a47022488a25c09b0135e6a27fd. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/FR50X2287813.
Pa Pa Pa (Inspired by the Papageno/Papagena Duet from W.A. Mozart’s The Magic Flute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8c0739d4877b216fd27789de2b18d0aa0f8e3c69ad25c9fca0542d87d121ea. 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/FR50X2287814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b4ad8abae00e7745a68aaa3e9e54874a643971718bc7c6a22f9a45ecf4b563. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR50X2057802.
Horn Concerto in E-Flat Major, K. 447: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f47a6705fe0ca9a4387a4fa6d7fdd4fc539fa660f202697cbfab86dec1c19c. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/FR50X2057805.
Rondo alla Mambo (Inspired by the Third Movement of W. A. Mozart's Horn Concerto, K. 447)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a5c5e40dabd83b4936239aa49c2367f670b9c444825dceeb85c486994efba1. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2057808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6af3d22e8acc7effc60c72025ebd60c5691a8976048eaabf774de2b587956d. 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/FR50X2057810.
Concerto Movement for Horn in E-Flat Major, K. 370b
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987e023122813b315a7f238a8408436e847be230a9c058690cdf60e48786d0e5. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:58:53Z), 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/FR50X2057801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9179461bc4d00d25e936db70950c3a41fa9c4a3ce9e6805292b8b8df99d7eeeb. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:42:35Z), 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/FR50X2057809.
Sinfonia concertante in E-Flat Major, K.297b: II. Adagio
Horn Concerto in E-Flat Major, K.495: III. Rondo. Allegro vivace
Horn Concerto No. 2 in E-Flat Major, K. 417: III. Rondo (Allegro)
Cuban Dances for Solo Horn, Strings and Percussion: No. 5, Sarahchá
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a5c5e40dabd83b4936239aa49c2367f670b9c444825dceeb85c486994efba1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR50X2057808.
Rondo in E-Flat Major, K. 371 for Horn and Orchestra
Hristo Popov Plays Haydn and Bologne Violin Concertos
Piano Concerto No. 21 in C Major, K. 467: I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0aec3c6f7fbdf1a2272bb6a38f975db3500d2eb337b98b60ac305db40c7fcd. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/USSM11607698.
Piano Concerto No. 21 in C Major, K. 467: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77678ff5b4a69834ed9d713e3a34486d3860eed0f90c86c3f5a1a0d6585a69fe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSM11607699.
Piano Concerto No. 23 in A Major, K. 488: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bfc68dd73c22ba1a4870c4ef5b3e4492182f5a38d940659db96c8d32996c6f. 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/USSM11607702.
Piano Concerto No. 23 in A Major, K. 488: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d390f4419f05957715dce15daaf840e8a429e30ed8c479fb9b3ae53e0720e9. 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/USSM11607703.