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 0x43498000c419610459e029ba3b030c304ffb941ac8f855b20762fa85125ac5f6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16c4ccba-507c-4fa8-9ea6-fa403159a04f.json and https://artists.proofprofile.net/proofs/artist/16c4ccba-507c-4fa8-9ea6-fa403159a04f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x5ea9bd25611df9baef4a3017344c5f59b591131cd86506ccb319313e09e77ed7. 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/USCGJ2193790.
Piano Sonata No. 14, Op. 27 No. 2 "Moonlight Sonata": I. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdd97857345856a64c2d39a41a23fe194d840d8288dd13bb5d368aab598679d. 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/USCGJ2193791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751281ef37a5795c307b2bf37a968a7555277ad793afb192bbd33f429e8550bf. 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/USCGJ2193792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c9c83065d9efb65279b36f87b4015462f0f3437841328e87273b2b932dbe69. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGJ2193793.
Lieder Ohne Worte, Op. 30: No. 6. Allegretto in F Sharp Minor, MWV U 110 "Venetian Gondola Song"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ec94ee690638477a6d161061c9250b3f598f0921ae38ecaff024c60292e9e7. 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/USCGJ2193794.
Scenes of Childhood, Op. 15: No. 1, Of Foreign Lands and People
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb760ce685285ac85b6096c6220799cf8c315f6d78276b7e8a90ef914fe77e3bc. 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/USCGJ2193795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4fdc88ec8d8638e3d83459eadedce47e578d6cbb0e5d38e0d1917c6bb464cf7. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USCGJ2193796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d86d030f8305f46335533a8d0ce3a39ce1840586128313a461c40b31a0d4469. 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/USCGJ2193797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1b22cff1b78fb07c4c3e428625ce72e5f003bf9ec82d11a06db6b5a99ba170. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USCGJ2193798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa41c5b4e158683db615b51b8bdf0df4e775697cb3be6f69579f17b17ead2ff8. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USCGJ2193799.
Sonata No.20 In G Major, Op. 49, No. 2: 2.Tempo di Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5441a42efcf48a428ed437237840ee05bee22d3aca605f7472bca2ac91850adf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/AUGBT2310461.
Symphony No. 9 in E Minor, Op. 95 “From the New World” II. Largo (Arr. for Piano)
Symphony No. 9 in E Minor, Op. 95 “From the New World” II. Largo - Arr. for Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441f3f543cbc801fc1ab5dc6ba849e34b97af4b49a0ef36196bbc98c693cab64. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AUGBT2238985.
Cantata, BWV 147: Jesu, Joy Man´s Desiring (Arr. for Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e56aa6f0ce4a61ad01aef09605fbdc23b95b2ee2328d3d066bcde0b2657880. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/AUGBT2238984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504d3729586ea3391128ad71b0f6f28f51a8fa1e49449517608ea93145909a41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUGBT2238982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525fee456601618daa20061dd85b5b0f461aface82ce5f83c04fe101b6e69ceb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/AUGBT2238978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbb15c97b508ec027e3fff6fc1178f8991100a087eb996e4a640c23d4d3ebb9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUGBT2235601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84256e869de246b940f1c6a01713e2fdc634421c6b17b0d985e74106a82b44bf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/AUMEV2251734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a432249c4246440e0e541a61f7d17c5574976f281d29cd655ba2cfacfea398. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/AUMEV2215983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636992e0855f99676b5a8ebb850ba5fe1fb785d62e0c82da24b1a4aaebe02b95. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUMEV2155205.
Musette in C Major, No. 14 from Wolfgang's Music Book
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf41a02783f2ca3da904c668a0fcce2f5cc68853f395745d7374d8c523c41a9b. 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/USDY42176578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906a4b64ecf116a812e10064fc0bcac86664931ad05fc2c5a91af9efa4860e74. 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/USDY42176579.
24 Pieces for Children, Op. 39: No. 20, Clowns
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ff8b34a59b02282b99dbb9b8da90f0b492082835f867852a91c79cdba66ab1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USDY42176580.
Sonatina No. 1 in G Mayor, Anh. 5, Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4425e005049fb80d0c3292fe623737387e5b882bf0012a690666f304e249651b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USDY42176581.
11 Pezzi Infantili, Op. 35: XI. Galop Final
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21379566fa740202b2ead5da9482e6c25c103bcfb6ff924fab64dde928e1a90b. 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/USDY42176582.