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 0xf011b12382d4bd06ae4bb87a0b70cd40bf2f596ddd21a8daba5dd26891e24073. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18c895ae-3302-47c5-9c95-4712cb76a308.json and https://artists.proofprofile.net/proofs/artist/18c895ae-3302-47c5-9c95-4712cb76a308.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Divertimento No. 5, Kv 439b (Kv Anhang 229): Polonaise
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 0xafe3768c3aaa88123fbe90b5fbe3287817b3826dc3ac75d141a3c11565d08235. 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/NLN580512875 — a six-check JSON result.
Divertimento In B Flat Major Kv 186: Allegro Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8c78f80f68c717bb5313c4731dbbe03a6ba4a09f2def6c41318ccf6dc0fd31. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580512895 — a six-check JSON result.
Divertimento No. 6, Kv 439b (Kv Anhang 229): La Ci Darem La Mano (From Don Giovanni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b92ec3cd08c5826ad5e7d84f060b282d57815dd506e53d14208a2979152d2a2. 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/NLN580512879 — a six-check JSON result.
Divertimento No. 4, Kv 439b (Kv Anhang 229): Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc829991d4510913bfd22d9cf3283cd561a9700e3182a65c82d1a299cd9d1c4. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580512870 — a six-check JSON result.
Divertimento No. 5, Kv 439b (Kv Anhang 229): Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767f7abe2db36a3da5e790bd4945e56f1565e6ebd96a1059a261f5bf9a561e05. 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/NLN580512872 — a six-check JSON result.
Divertimento No. 5, Kv 439b (Kv Anhang 229): Romance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02075c69a6d04cb5680737d1a798c32182b2a7403cc169e670788eeb8231fb1c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NLN580512874 — a six-check JSON result.
Divertimento In B Flat Major Kv 186: Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cdd6d1d6172cb1cda1d947806b971cb721c07777c9708023799b590ec3a384. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580512896 — a six-check JSON result.
Clarinet Concerto No. 5 in D Major, MWV6/36: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd8e8478f2eab510b786ef098e68ae7d2a9532ae4da53d89e32312d882a0f80. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/NLY330725411 — a six-check JSON result.
Clarinet Concerto No. 5 in D Major, MWV6/36: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2ee6cf9e4398bbae141bf8d5940c885a994a5e588702f54f1dd21a7bf057d8. 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/NLY330725412 — a six-check JSON result.
Clarinet Concerto No. 5 in D Major, MWV6/36: III. Tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32db216d49dfbccb96b44348f47830d2648d90d7798e3c55d94ab3e672ebc8b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLY330725413 — a six-check JSON result.
Divertimento No. 4, Kv 439b (Kv Anhang 229): Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea4826742ec7dcfab55123c20ce90c12fdeb68345a17d3f5fc9e4a8afa1185c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580512866 — a six-check JSON result.
Divertimento No. 4, Kv 439b (Kv Anhang 229): Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b04541924ec13dd3e037f3aaf5832745843d702f64186533d5ba359262497. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLN580512868 — a six-check JSON result.
Serenade in E-Flat Major, K. 375: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdb838240cd462cddb03f9aeb749b6105114e4dcbe8c42e71947d82fb9b22dd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331410614 — a six-check JSON result.
Clarinet Concerto No. 1 in A Major, MWV6/41: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab410f67f0815c96e8e940e6cfa2f0ad583f6a6419d5a5a7750ec78292c770c. 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/NLY330725414 — a six-check JSON result.
Clarinet Concerto No. 1 in A Major, MWV6/41: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00535d685f088201534623db660c4eaf7d442a8708ad71d0642a630f21cb70f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLY330725415 — a six-check JSON result.
Clarinet Concerto No. 1 in A Major, MWV6/41: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6826fba3069a408e8d862069f57903b6193fc8da031655fa76097395b87c1584. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLY330725416 — a six-check JSON result.