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 0x4b8948506538120516ef659e444be4abf2d0a6b2bde5e03b361e64a084e532a5. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a132d132-cff7-4338-965b-0ecf820a75ac.json and https://artists.proofprofile.net/proofs/artist/a132d132-cff7-4338-965b-0ecf820a75ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto grosso in B flat, Op. 6, No. 7: 1. Largo
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 0xddfee5b0712e98c9f0cc9adc016997f869e7099480afc2f5687dd191ff72962e. 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/NLA508603130.
Concerto grosso in F minor, Op. 1, No. 8 "Christmas Concerto": 2. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9003790d1f4b29e9d63fcc563afb2299f75593887eb1c1a55da941e719315e1d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508435713.
Concerto grosso in F minor, Op. 1, No. 8 "Christmas Concerto": 4. Grave - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5cb0c35acd222697b064bac8c7844a1f50a8d471ed2076e78519fa7f0f2570. 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/NLA508435715.
Concerto grosso in F minor, Op. 1, No. 8 "Christmas Concerto": 6. Andante - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09db61e65ec7e03c32ea481badcc00078bf472f9f4791fcf790552818ec20b4. 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/NLA508435717.
Concerto grosso in B flat, Op. 6, No. 7: 2. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210994f6c66877a82083ef701d084b1254c67523c08728ebc2fcd2b29a05321c. 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/NLA508603131.
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
Concerto grosso in B flat, Op. 6, No. 7: 4. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b61f91ba5100b04f80b3aad2122f04979b771e5df6e02cbd73a201a21c6f2f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLA508603133.
Concerto grosso in B flat, Op. 6, No. 7: 5. Hornpipe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed6cb2ccd86a1a7796299d7667edf5b62eb2ced7dbb5bb84794935923c1afe5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508603134.
Concerto grosso in F minor, Op. 1, No. 8 "Christmas Concerto": 1. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2c6039ba686a79ad0126542482de55aaa633ab179dc40622fc99e7f7427df5. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLA508435712.
Concerto grosso in F minor, Op. 1, No. 8 "Christmas Concerto": 3. Vivace - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89c7facda53c0e409188d19380d378596659a076e0080714da12d4d3eee6301. 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/NLA508435714.
Concerto grosso in F minor, Op. 1, No. 8 "Christmas Concerto": 5. Largo andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cffb2c8704a0f0e74218ec9b067b91fdaf3f0516e54440153b5b8b32b97e055. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508435716.
Concerto Grosso In F Minor, Op. 1, No. 8 "Christmas Concerto": 7. Pastorale (Largo andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c7b6d07d4a23668d2b1325cb73d56e6215e301e15e3b60d3e281032e10ada3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508435718.