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 0x996e50cdd50d4fb6db5359ed8757dc994602cd32da11bfc282694c5e2fa638b6. 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/b9cfb25a-0629-4ab3-a759-a2119bb68b58.json and https://artists.proofprofile.net/proofs/artist/b9cfb25a-0629-4ab3-a759-a2119bb68b58.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Symphony No. 40 in G Minor, K. 550: IV. Allegro assai
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 0x87af0590764e65dd66efcd551a70da4f777c92158ead2d51b49de9cd0a37a72a. 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/NLN580591657 — a six-check JSON result.
Harp Concerto in B-Flat Major, HWV 294: I. Andante - allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf208384438d55c0dba7f2c79f3341c8ac2bc33e83387551e5cdd660d646736b3. 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/NLY331501254 — a six-check JSON result.
Harp Concerto in B-Flat Major, HWV 294: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f09cb2006d8bb04b575f9fc48e63aca7ddf2185f14e03be082a6d897f394d5. 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/NLY331501255 — a six-check JSON result.
Harp Concerto in B-Flat Major, HWV 294: III. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd986c7087beedb1d7419bb26424d7bc8f66e4060bcd91dfeff7a349d0c7a5b0f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLY331501256 — a six-check JSON result.
Concerto for Flute and Harp in C Major, K. 299: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dba726754b9579006fbe9efcebdc13f8e6680042fbe0f063e06eada0f76018c. 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/NLY331501257 — a six-check JSON result.
Concerto for Flute and Harp in C Major, K. 299: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd17959286f9f76f844acbc27face00969328930cec10fd5c588cb697ed8590. 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/NLY331501258 — a six-check JSON result.
Concerto for Flute and Harp in C Major, K. 299: III. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71c2d65f54c8e96062af13da76210340f40dbbc3dce1cf5fb082aad0b1e6bf0. 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/NLY331501259 — a six-check JSON result.
Harp Concerto in C in Major: I. Allegro brillante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fbe1325a4b0e5460168a9ae5d7a5758d3c1222d28e7d18f38250ab61ad26c8. 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/NLY331501260 — a six-check JSON result.
Harp Concerto in C in Major: II. Andante lento -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f286a83955793445203913cbffa2dd386b2e835e030982ce31375b2284cf63. 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/NLY331501261 — a six-check JSON result.
Harp Concerto in C in Major: III. Rondo. Allegro agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5348aefd4993b777520e4bef35a2c1001a4695a3f00532f9fb49072ec1c0955c. 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/NLY331501262 — a six-check JSON result.
Harp Concerto in A Major: I. Allegro molto
Südwestdeutsches Kammerorchester Pforzheim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d4ccb176acc42887fbf1e4b8bde4f1aceb933955b7ecaaa9fee09ca582c2f3. 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/NLY331501263 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07e8973a8cb489f76965a7b962edc5d853fdc347ed77774022fed122787aea2. 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/NLY331501264 — a six-check JSON result.
Harp Concerto in A Major: III. Rondo. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929b442dba0eb1f199d6a031b31dfa9325a5239106c64bf656af1e5ffdb0adb1. 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/NLY331501265 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f144f78ef31ec2a08d5d6738ea9b4d60f8238e72f5017fdda0e6a2fbafef1f0. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLY331501268 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84451ab1c234f0afd704a0096e8a02b7960d77be0bd19a674d0d5cd75f99f421. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/NLY331501269 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4ffeeac9f8cf56558c5a37b4c9eb55e56d67e525052e03fce12d9ef690ea86. 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/NLY331501270 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ddd7e5b8b6a22c5800c1a0196ef1d8ef2c471951c151b6321748c82ef3790c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLY331501273 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44172c63b84ae03773c09c062f01956f8cbfea95d7545bb64f0ea55ffd38227a. 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/NLY331501274 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557fe461d0c7c837868eeff4742edff1a948471f8a4cdd7c4fc9c514e6d93d00. 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/NLY331501275 — a six-check JSON result.
Clarinet Concerto in A Major, K. 622: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58aa4d721a452a6e793b2a9ccd511962599d5d2deb853629c68be2b38c734c9. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLY331410368 — a six-check JSON result.
Clarinet Concerto in A Major, K. 622: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277e392a3f7ffeb7c2ff377252aa8d2bc320cf5bbe938d3971c3c0915c3fad12. 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/NLY331410369 — a six-check JSON result.
Clarinet Concerto in A Major, K. 622: III. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c490e9a208c77a5e414b1b7cb926051a1c8c74562539badd5b45c517ff5cad9. 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/NLY331410370 — a six-check JSON result.
Mozart: Flute Concerto; Flute & Harp Concerto etc.
Flute Quartet in A Major, K. 298: II. Minuetto - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f7e014b5716c7d5d776264eb6c2f1ac05bab468ded3aebd827df9a480645ae. 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/NLY331903126 — a six-check JSON result.
Epistle (Church) Sonata in C Major, K. 263
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7b70e63d44933565e38b95ef7822e96b1ed4d5435813c6d99272a2a055f37c. 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/GBAJY9037707 — a six-check JSON result.
Epistle (Church) Sonata in C Major, K. 329
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890b444b73852e179ad07450fd3369e7103b5774b7a7c616e0dc07c4c28a8acc. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBAJY9037701 — a six-check JSON result.
Horn Concerto No. 1 in D Major, K. 412/K. 514: I. Allegro, K. 412
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7b1710eccabfbf85d371affea665d636087e9f44139122004c5d262a5aafca. 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/GBAJY1509710 — a six-check JSON result.
Bach, Händel & Scarlatti: Konzertante Barockmusik
Clarinet Concerto In A Major KV622: Rondo, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecf14594d33aaae8564c6cd3685aee570baedbcd433ceb4fb4670e3ce607800. 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/NLN580547772 — a six-check JSON result.
Concerto For Flute, Harp and Orchestra In C Major KV299: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41a0823a314ff87eae9dcf72dde6052431402f1ccda19fe8d00ad0e2d732a40. 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/NLN580547773 — a six-check JSON result.
Violin Concertos - Wind Concertos Part: 1
Clarinet Concerto In A Major KV 622: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf346d133877d7e247f8b436eeaabe93cb62ee043cae94a62822d36ac5e5f7d49. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580541934 — a six-check JSON result.
Clarinet Concerto In A Major KV 622: Rondo, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55d3ac12161c2c171eabc945b1941af3f333e3cbd1166c79d646926b20dad42. 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/NLN580541935 — a six-check JSON result.