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 0xa93de6396a6cd16bc7f8baa4ab4794c143ff3ca422dc02583374153eb4ea38b4. 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/406125f0-8d9a-415e-96ec-92800d8fe086.json and https://artists.proofprofile.net/proofs/artist/406125f0-8d9a-415e-96ec-92800d8fe086.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Troisième livre de pièces de clavecin: 19ème ordre, La muse plantine - Adapted by Marina Baranova
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 0x9b3bb6da1113df8505f5bf9bc8d2748b5512a31406d570b0ef5fb1b6a8550d30. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/DES380022738.
Troisième livre de pièces de clavecin: 14ème ordre, Le carillon de cithére - Adapted by Marina Baranova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda443d596d6cbe96ccd800f5f27352b011f291055397dacfdf505d0570143d0b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DES380022739.
Troisième livre de pièces de clavecin: 15ème ordre, Muséte de taverni - Adapted by Marina Baranova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4e27c20a846ebaee2415fa3b9537b714e3e40d168756d8dfd8a9a0ce91d68c. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/DES380022740.
Prelude in B Minor, BWV 855a - Adapted by Marina Baranova & Alexander Siloti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe771a5b1ac61f7f7f7e1f7e61070d300bd92fe2a8d87c71e4c2177a776ab65. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/DES380022741.
Was mir behagt, ist nur die muntre Jagd, BWV 208: No. 9, Schafe können sicher weiden - Adapted by Marina Baranova & Egon Petri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef8448aefce5dc261be2e7f388887d424cbbcb64a0b8692ac8d905cf019b6e5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DES380022742.
Chorale Preludes, BWV 734: Nun freut euch, lieben Christen g'mein - Adapted by Marina Baranova & Wilhelm Kempff
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c7b69f8c72e42b1c504d75e634475d13207921db5f945b4c2ac69832b86fe1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DES380022744.
Suite in G Major, RCT 6: No. 14, Les sauvages - Adapted by Marina Baranova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b70f73a79eab8f5946e5a92dce025b2f6f96e4a1a3c3cee20307d8bad9402b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DES380022745.
Suite in G Major, RCT 6: No. 12, La poule - Adapted by Marina Baranova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958238e5ac9c1d733a1c90a8412d866511ea7e7ca5af88baed01bf6958547698. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DES380022746.
Suite in A Minor, RCT 5: No. 2, Courante - Adapted by Marina Baranova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71611816990c25e277a600b5ac11553659491edca30c3ae0a7aab4ba45ff508. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DES380022747.
Suite in E Minor, RCT 2: No. 4, Le rappel des oiseaux - Adapted by Marina Baranova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cdd0c45abb14d23c1dfe15e42e843cc6fc8e5636c65435fb6476230490add3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DES380022748.
Suite in G Major, RCT 6: No. 12, La poule (Remix) - Adapted by Marina Baranova & Hauschka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd1f91c8af6944536ba2afa5ed8ce3f4b62509bd0a035cb39642752676ef47e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DES380022755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c08384bbbd4c91a65c579ff8073db192ef3b5778bbeb8bca99e275bafc75bef. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DES382173004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebffa5231649464b96971e58557b3067e5b216668283e789e9bba7d7541f231. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DES382173005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74a3153b5755ac70975ed6e90c46e313d8858975890df6cab1c2f99a716e99b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382173006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20dc411d1f40523d20e9c7e5e2651fab02f488fe5c32e3ca03621cf34ec4791. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/DES382239001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf7c6556c9023ba3282a476a9db8814c49b306acd83552dec9fa937c4878e17. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DES382239016.
June - Matter. Antimatter. What's the Meter?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97b06176c03d9ce7698a919a155b86f88c499e1065827ee065866dcc9e75c50. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DES382324007.
Hark! the Herald Angels Sing (Improvisation in E Major)
Hark! The Herald Angels Sing (Improvisation in F-Sharp Major)
Pièces de clavecin, Livre III, Qunzième Ordre: No. 2, Le Dodo, ou L'amour au berceau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae20fe955d7f1f57e4fd606cc78eda007fe25f06ed88dbd17361438b10bedc83. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/DES382501011.
Lyric Pieces, Book IV, Op. 47: III. Melody
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03637cea18944eca1346511e502536e048790a8d98d36a8e39f370c39b8281f8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DES382501013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9c8f4f09a1612ae102ba1353e3bf1644e77f1464a4dd1aae0f2201ed4d76b1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DES382501007.
Songs With Words: Auld Lang Syne Extended
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1373f43849afcf578e6aeb63f9421facdbd47857109b3448657d35798a67b2. 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/DES382346009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35ff70171bb82923e2cf278df1f6f1d3250543a04174a8e1ad2896e7289fa02. 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/DES382123004.