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 0x6fb05ef8c50c87d3bacc427a8e01c8711e181eb38709f3d9f01b2a951ae049bd. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/831a5761-37bf-445b-8a56-12167793d73b.json and https://artists.proofprofile.net/proofs/artist/831a5761-37bf-445b-8a56-12167793d73b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Duet in C Major, Op. 31, No. 1 : 1. Allegro spiritoso
Musical Evenings with the Captain, Vol. 3: Musical Evenings in the Captain's Cabin, Duos for Violin and Cello
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 0x43318a37f215b97b67df9e922bef80dd1b664f68a73ff31c91a81319707c4452. 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/US42M0430117.
Sonata for Violin and Cello "Il pastor fido," Op. 13, No. 4 (formerly attrib. Vivaldi, RV 57): 2. Allegro ma non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142ccfea727449442e054162ee9da0ebd84ce0632b26797218a0cdf734e92647. 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/US42M0430123.
Sonata for Violin and Cello "Il pastor fido," Op. 13, No. 4 (formerly attrib. Vivaldi, RV 57): 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aced7d906421abb17290e1857690eac05a2fcc80b09b3bba9a65886deb8c7cb. 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/US42M0430125.
Duet in D Major, Op. 18, No. 6: 1. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010347c4f4b5d495dc969b05fe10990b0dd0f0b024f7f36a1d4e807815e12820. 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/US42M0430126.
Duet No. 6 in C Major: 1. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e83fdc70036eb0901479398c5cf1148df2bdb0fd0967e1c11d186396a8aab69. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430112.
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 0x3793f12ef7c50363a36db96494187828108ddabb39b6859f12073b053737bf83. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US42M0430113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a5ef68781e52c01369a6fcd4eb2d2935447413a33039d61ef8c3d7bea15793. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2103d0c17945ad45de65bd86c799b33384ed760c9ea1655bca8a2f0aeef2809. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4102ce855392f7ee4a1a20182471953d4833684f753c86bb3c4cf489ca49687. 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/US42M0430116.
Duet in C Major, Op. 31, No. 1 : 2. Larghetto stile antico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37863a73cd2d64fcbf54072910660b778c32434593fd3d8b2d73ddde2dcdcf0e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US42M0430118.
Duet in C Major, Op. 31, No. 1 : 3. Allegro scherzoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365c7947ae2d46827ddffe78d49c132f29b666227cf198b12b1c9111928326f5. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430119.
Duet in B-Flat Major, Op. 21, No. 1: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492968b79366e05d8236746cc8ccaf795307f65e5bedff2f6f35819656a438ba. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/US42M0430120.
Duet in B-Flat Major, Op. 21, No. 1: 2. Tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12feecc34fe46394f0b4c847234dfcfd5c44fd40840511ccbab9000649d5a2f8. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430121.
Sonata for Violin and Cello "Il pastor fido," Op. 13, No. 4 (formerly attrib. Vivaldi, RV 57): 1. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340dd60783e76591e998f407b342bc681cd8f6b8155ca8972f45c9df2302c14f. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/US42M0430122.
Sonata for Violin and Cello "Il pastor fido," Op. 13, No. 4 (formerly attrib. Vivaldi, RV 57): 3. Pastorale - con tenerezza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f25c1a937cfbcafab4d84c885e471332d5e9696222c0c86e8425217ef9fa2c7. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US42M0430124.
Duet in D Major, Op. 18, No. 6: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec222aa35a78e5a407ebf11fb29dff1b7d77f5116665c1ae70c0d9cd038ff20. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430127.
Duet in D Major, Op. 18, No. 6: 3. Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe93398b8485434453cb10b98449f66f93094b8541cde78c699c0eab56649c9d. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US42M0430128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d9777c8756328838e75a603ee85657f01b4ed0832848c102d63a3956a5fa78. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/US42M0430129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5363cbd230f3e0d07f9f13a60dbc81cd7b202858072beb254af9dd8385f833d4. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/US42M0430130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe258ea75b5978df237b7bcee5af4efd9ba4e897b1825213911fa1268b59aef. 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/US42M0430131.