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 0x1c902e4b9186f758cd1c25adeb5d7e89867239433176e8eede16a2cc7cee7e81. 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/a45f2f52-28a9-4ba6-9b33-f417683fd9ec.json and https://artists.proofprofile.net/proofs/artist/a45f2f52-28a9-4ba6-9b33-f417683fd9ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, J.S.: Concertos for 1, 2, and 3 Violins
Concerto for 2 Violins in D Minor, BWV 1043: I. Vivace
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 0x157c5af39abffad3da316f7ecc8bd969f78937f97de57525afcab0d831c97d71. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025254.
Concerto for 2 Violins in D Minor, BWV 1043: II. Largo ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91107e2bafa642cee43301f786aa2a2fdedd632a2548880489ec5dbac2abe1d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025255.
Concerto for 2 Violins in D Minor, BWV 1043: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650bd9ec0e93a283e2065df2b311aa19235dddbde76ba90e33e412995a7668b7. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USB8U1025256.
Violin Concerto in A Minor, BWV 1041: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd17b0f4fb64bcb15f55f0b952cbcd15597fa247e9e8e8864103bad53d3b34f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025257.
Violin Concerto in A Minor, BWV 1041: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641aadc1b6e16101509c646f7da101638e94d8c76461b63de4bd51df024e59d5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025258.
Violin Concerto in A Minor, BWV 1041: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1479dfa3b41e6c01ba3c481c378ef9c78574e77afee49347de1dc93c8e847db1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025259.
Violin Concerto in E Major, BWV 1042: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17a7a687a050ed963a7a82664fa7cda0870e5f37dc03f27883153f062fbd916. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025260.
Violin Concerto in E Major, BWV 1042: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dcdaff760f190cbff6fd0a36ccebec4cb1d6a0830bc01136114f8fd67eb6cf. 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/USB8U1025261.
Concerto in C Major, BWV 1064 (arr. for 3 violins and orchestra): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc9ffcdd5fdcaaae41b38be682b89768f64e10a9cf96ff38154b8f07fc34c38. 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/USB8U1025263.
Concerto in C Major, BWV 1064 (arr. for 3 violins and orchestra): III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf089d7d02bef2d869c32f3b773f9496bffaeeaa3e8a3528fd20e286120bb89fe. 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/USB8U1025265.
Violin Concerto in E Major, BWV 1042: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e16e967d7b891be2858be0c220bd05b3d5cd5297e02dc7a9f281a5bc5e67e48. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/USB8U1025262.
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 in C Major, BWV 1064 (arr. for 3 violins and orchestra): II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4140b51a7b8d638cb6653ce032fcf75bafabe8fee2b82949251036d96c6effe0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1025264.
Vivaldi: Six Concertos from L'Estro Armonico, Op. 3
Concerto No. 8 for 2 Violins in A Minor, RV 522: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81352d477e66c3cec61348a15c8a16f246b823da02b6c2258b04378c80212c3a. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBABV0610595.
Concerto No. 10 for 4 Violins and Cello in B Minor, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7a42a67efce2bab754559235a6412a6e28abedcae55795e9dd290459dd92a9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBABV0610607.