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 0x2b17fa05fa4f0381a8f12cff2d3634c2430c2b86cf5239345f583df7c4ccc41b. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc1e2b18-9e59-4db9-a6b2-f3e088058bc8.json and https://artists.proofprofile.net/proofs/artist/cc1e2b18-9e59-4db9-a6b2-f3e088058bc8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: I. Largo
Valentini: Concerti grossi, Op. 7 (Alpha Collection)
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 0x5e5d203d3beea9ffdc6091deb398c36970acb295cb56da869b2310ac84a75ffd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR1P70100330 — a six-check JSON result.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18dacd7d21e7cb6844bd7c863bac805633943e473c8b0568ab832c73ba189cfb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70101420 — a six-check JSON result.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185838fd29a9ebefd88e4371196f57d8a1a968d1ccc2394c2fb876c1262eeefb. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR1P70101180 — a six-check JSON result.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: IV. Allegro e solo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95105e8dd9e4496aba904e349a6c8d7cdfd1e5ebf16065c366396a708dcc8498. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR1P70101190 — a six-check JSON result.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: V. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccfecd4358783fd0af56b422436490c2c01b147f37f1419a07cfd9aefaf06c3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70101200 — a six-check JSON result.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: VI. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166717abc2d25bbdf15ce4a26a9bf2e7da18e8c38019f744587e82e3e8377cdd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70101210 — a six-check JSON result.
Concerti grossi a quatro e sei strumenti, Op. 7, Libro secondo, Concerto No. 11 in A Minor: VII. Allegro Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0410873ea5bcffdd1efc65ebaff89d704590b36255defd77b52ced58248414. 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/FR1P70101220 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18dacd7d21e7cb6844bd7c863bac805633943e473c8b0568ab832c73ba189cfb. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70101420 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185838fd29a9ebefd88e4371196f57d8a1a968d1ccc2394c2fb876c1262eeefb. 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/FR1P70101180 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccfecd4358783fd0af56b422436490c2c01b147f37f1419a07cfd9aefaf06c3. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P70101200 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166717abc2d25bbdf15ce4a26a9bf2e7da18e8c38019f744587e82e3e8377cdd. 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/FR1P70101210 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b06916cd0143d505b507173df8970d392c36c7330fce40dae95e2041e6a378. 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/FRZ139801342 — a six-check JSON result.