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 0x3beadf744cdf1d94392bf45919493ff3f2f6a5d9d68311419669a08643e3f651. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/685f7303-f4e0-4830-b852-76f1ab9e005e.json and https://artists.proofprofile.net/proofs/artist/685f7303-f4e0-4830-b852-76f1ab9e005e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xeba4827fb37f9b01301e275bcaf0957a6f36257393bd4741c15f94f3b6bd39e0. 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/USA560947146.
Serenade No. 13 in G Major, K. 525, "Eine kleine Nachtmusik"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758190d8704809b954f52d4983809641525d9579e4d845a62884812116b4a90b. 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/USA560794419.
Flute Concerto No. 2 in D Major, K. 314: I. Allegro aperto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584ce46f6a6880209200ece023cd2db28a0404140a4426aed27f59f500369ca8. 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/USA560794421.
Cassation in B-Flat Major, K. 99: VI. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1dd6fb9de503502a9fd447a4df33b3c2a144392af9b4219f997ad764b612b9. 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/USA560794428.
Requiem in D Minor, K 626: III. Sequentia: Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84013d01604ebce6a6651b61e1ddb63a0bf60311acad4ba93e2e3a0f2b80fa43. 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/USA560794432.
Piano Concerto No. 23 in A Major, K. 488: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb948c3e3ccfb678710cbc422491ae527e567e83e3b4237b67a76281bf75f1ddb. 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/USA560794420.
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
Symphony No. 40 in G Minor, K. 550 "Great": I. Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7308af58719e4b2e5a98b61f039ba3f1e30fbc26c3fd1835ffc9afd501caf2c0. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USA560794422.
The Marriage of Figaro, K. 492: Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31d06afb8f87b209e0a1ceb5b447d43f95b94a875d593ca979fc01e46a03057. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USA560794423.
Clarinet Concerto in A Major, K. 622: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3e7de52df4806d7e4b8b27f4fec1637b1ef524301db4d60f79d245343b1ba5. 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/USA560794424.
Serenade No. 11 in E-Flat Major, K. 375: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fd489aa110ed9aa95e6d62e620cffe18f46b6a910ec605e9830fab82cb5433. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA560794425.
Piano Sonata No. 11 in A Major, K. 331, "Turkish March": III. Rondo: Alla turca (Allegretto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6c0b26873f8a996a437c98e1ba177970ef29d1e92cf2f812ff8c0a43d89c69. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/USA560794426.
Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224a07b64d076b42beb794fe31573e5c42c15c6800afd70d887028445b3f6bcc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA560794427.
Requiem in D Minor, K 626: I. Introitus: Requiem aeternam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb01f082d00d1ed8d37c28735f1564e243ca28b1ef55dac88fbd9a0c3bd83c4. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USA560794429.
Requiem in D Minor, K 626: II. Kyrie eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71eb782e2a99852ca9a41d5c8cb0e75e9c9545ed792a80f812c98bda058c60f7. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA560794430.
Concerto for Piano & Orchestra No. 9 in E-Flat Major, K. 271, "Jeunehomme": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b65005cb68cfb8ef7bcf3b6d9e3b96a7820c8d7ff6e892a2cd0efae08e47b5. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USA560794431.
Serenade No. 7 in D Major, K. 250, "Haffner": I. Allegro maestoso - Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65d144ade44ff773a40473af0c9e0607f90bad59f288c6239dcc03f6516651c. 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/USA560794433.
Serenade No. 7 in D Major, K. 250, "Haffner": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5ff8b2a60905f36fea3e238b62be8beace837f3505e121da4d4a39ac58ebda. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA560794434.