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 0xaa56ce9f4c91f1447af1781b33be11a2bf6b2d06ccc4a32126df44922af32d23. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd8237c7-11e8-42a4-8a98-fbf3ff07c671.json and https://artists.proofprofile.net/proofs/artist/fd8237c7-11e8-42a4-8a98-fbf3ff07c671.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Italian Connection: Vivaldi; Corelli; Geminiani; Lonati; Veracini; Matteis
Trio Sonata in D 'Bush aboon Traquair': 1st movement: Andante
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 0x69ca783c062f0036851fdb513e7d68760376a2189c2b0db2b72e8edf4211ed89. 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/GBUM70903770 — a six-check JSON result.
Trio Sonata in D 'Bush aboon Traquair': 2nd movement: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbbbb5a62c3a53cfd5d315ad826120f7ae4acc539248f982d6bea34e7726da8. 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/GBUM70903771 — a six-check JSON result.
Sonata in G minor: 2nd movement: Allemanda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f8db7c731fd916abf0f6ad9ebf9c56680606a74c9e504feebb5a8594cee035. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903773 — a six-check JSON result.
Sonata in G minor: 4th movement: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb293225cc5ac34f6fe0b57c2827246ae8e71a7d7b7ebce28708f47f35832df4a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903775 — a six-check JSON result.
Trio Sonata in A, Op. 3 No. 12: 1st movement: Grave - Allegro - Adagio -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb9092d49b59fdc933475af21c53c24d85f2c262fb2b33c1ce92ff3ad9b8f5e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBUM70903776 — a six-check JSON result.
Trio Sonata in A, Op. 3 No. 12: 1st movement: Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ee4c364080cb9346cb07972de0e1dab4b47b3f47e317b55c664eb39f50fd6f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903777 — a six-check JSON result.
Trio Sonata in A, Op. 3 No. 12: 2nd movement: Vivace -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5a3965716292d7b0e6933f21707d304d92665c204df7760503f5fd9cf2ae03. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBUM70903778 — a six-check JSON result.
Trio Sonata in A, Op. 3 No. 12: 2nd movement: Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fbbeb99d41a8121632a1999e2efb5c17b3f9fcbebf81b16036d84cd6f6c4d0. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/GBUM70903780 — a six-check JSON result.
Trio Sonata in A, Op. 3 No. 12: 3rd movement: Allegro (Canzona)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7f4953a0ce6ead5feaa702bb2bcb2315a4f621e9dea6e21e82fa4d4c932db6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903781 — a six-check JSON result.
Trio Sonata in A, Op. 3 No. 12: 4th movement: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ceab0d46d3b59f4d63ff9758d4b96de1756bbe4d524c545abd6e5afa3b6ddb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903782 — a six-check JSON result.
Trio Sonata in D minor, Op. 1 no.2: 1st movement: Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43477a409cdbc7991c7e0d4482c04895a80990cd5a3e3f33e4cab720492d2a6. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903783 — a six-check JSON result.
Trio Sonata in D minor, Op. 1 no.2: 2nd movement: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bf4e609a25b385c2f0a07e7dee311f5a236828358ac680b0334d4da12a4523. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903784 — a six-check JSON result.
Trio Sonata in D minor, Op. 1 no.2: 3rd movement: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f35672132deb8b6f704af45620559ef7caa74d837263a2e2f346902249b4171. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBUM70903785 — a six-check JSON result.
Trio Sonata in D minor, Op. 1 no.2: 4th movement: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd582dc65197df2390db7bf157b37b749c8ae7c0092b7dcd059ef4175f157b9a. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/GBUM70903786 — a six-check JSON result.
Sonata in A, Op. 2 no.9: 1st movement: Allegro moderamente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a561b1a9472bd546699e3bea02b4e5efb48ef6407036964454320b38731159. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903787 — a six-check JSON result.
Trio Sonata in D minor for 2 Violins and Continuo, Op. 1/8 , RV 6 4: 1st movement: Preludio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b7b62ee61482f40a5627ed963be1acbbf943b26ba7789d9a72da7bc21afca9. 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/GBUM70903793 — a six-check JSON result.
Trio Sonata in D minor for 2 Violins and Continuo, Op. 1/8 , RV 6 4: 3rd movement: Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35692cbd030bf70b7d9a688f3b3075fb745527c9b26d2eba56813c1c417e0575. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903795 — a six-check JSON result.
Trio Sonata in D minor for 2 Violins and Continuo, Op. 1/8 , RV 6 4: 4th movement: Giga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d05d55357a6607a8eca277c1ca00cd42f83c93526d6316c49f4d36287116b5e. 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/GBUM70903796 — a six-check JSON result.
Divisions on a Ground (La Folia) in D minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcd281e9a4e6aaf87d8c6c247c931ec217ff208fcfa03f80dc5ddb2edc0c088. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GBUM70903797 — a six-check JSON result.
Trio Sonata in F 'The Last Time I Came O'er the Moor': 1st movement: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08caaf211b47fb98cfb0212ada14d2a6740577df0e43d5bf24eef5580b599d7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBUM70903798 — a six-check JSON result.
The English Connection: Purcell; Young; Lawes; Jenkins; Locke