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 0xaa6f6c7ecbaa1f52e30f734015eb07ddf1d385685a0ed00b3ecb972dd7378928. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/126f40fc-2b7b-4174-a169-510b1fa288a9.json and https://artists.proofprofile.net/proofs/artist/126f40fc-2b7b-4174-a169-510b1fa288a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580591657.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331903126.
Flute Quartet in D Major, K. 285: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e73b4bbff833e2b1ed4b44b9e55cac0fcbe308a5131d20b343bac2fc2852c5e. 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/NLY331903115.
Flute Quartet in D Major, K. 285: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c3fc5e07a462474a9356c5ecac62eb4c536654f53edd92f9e82362be6bf745. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/NLY331903116.
Flute Quartet in D Major, K. 285: III. Rondeau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cdd55840e481ebff6ee31aced59738143ad0856c4f369a9bc4392a8396d6e0e. 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/NLY331903117.
Flute Quartet in G Major, K. 285a: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26329248e3ff36b3ab0c4a0a3f62ce81163b9b5213ec5fd153ae5f7d66e265bc. 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/NLY331903118.
Flute Quartet in G Major, K. 285a: II. Tempo di minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2098f231024e6eed9814230820635057b07d07edb73c79279616a50b0e11a2db. 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/NLY331903119.
Oboe Quartet in F Major, K. 370: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb472fbdc0023ff4b324818e7a4cdf78d4c5a02e8747572d588b11d2fa38dbfd3. 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/NLY331903120.
Oboe Quartet in F Major, K. 370: III. Rondeau. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8186ce555ca03af800dee3c2d714da924ca5d3f3e2aba7b196dc6918a8c1f55. 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/NLY331903122.
Flute Quartet in C Major, K. 285b: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea59602f63d55020f2dadd3bd0f62f4e41e0520318f52f4b8e7ade6b210a505. 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/NLY331903123.
Flute Quartet in C Major, K. 285b: II. Andantino. Tema con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e1b3927a1503c3c7f13270556b2fb61217221ae2ed456c4ede815c2f6c4556. 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/NLY331903124.
Flute Quartet in A Major, K. 298: I. Andante. Tema con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60b8f911713b8972bc1a44a5d1d7976c1b717b61c378783560d2cb96a4ad309. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLY331903125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f7e014b5716c7d5d776264eb6c2f1ac05bab468ded3aebd827df9a480645ae. 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/NLY331903126.
Flute Quartet in A Major, K. 298: III. Rondeau. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443fe8cbc3de1e26b01a72d6c83795b42d320ebcdb4c7afbc28639efb16daf1d. 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/NLY331903127.