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 0x410478399239a8b77882a24d243f3429c9fe0f6ebab2d16db225d257ad427c7a. 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/ed8aa67a-9bf5-45e3-ae5d-9b772dca7f6a.json and https://artists.proofprofile.net/proofs/artist/ed8aa67a-9bf5-45e3-ae5d-9b772dca7f6a.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 0xbc99a8db1a23233400763132a98e738036c0f8d7712444312c45b5b29a1918a9. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/DEN962334104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9aaf1a7a96125b19ddac68e45454a3128488de062597368afc899a96b6b248a. 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/DEN962303401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca6bfcdc06df3c025b58023530659ea0073aca7b946ff40d6b5c61c1406f5e6. 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/DEN962334120.
PROLOGUE (Quasi Niente from Piano Sonata No. 1 in F Minor, Op. 6: IV. Funebre)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ecf92aa0bef4f303426fb2399a513d4785aa33df98d0682fef3a523a9b6c56. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T09:42:18Z), 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/DEN962334101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ff008b4c8af9d7afd9ed32dac12a2c30e91ff398c7c49b41597dabbebcd57d. 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/DEN962334102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763b79f97b4f51b6da8ca7ca039043cf3e5f7aa9a2c8e01be3095825c9e8c2f4. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEN962334103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc99a8db1a23233400763132a98e738036c0f8d7712444312c45b5b29a1918a9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962334104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf079bebb8b5e31bc33477da26be76bde1b3ca1cd828f787b7eed5efb4dc66146. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962334105.
Piano Sonata No. 1 in F Minor, Op. 6: I. Allegro con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03652babfd806f25bf7bd1bc004dc0c057e19e841bc10853899db64fc642cd6. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEN962334106.
Piano Sonata No. 1 in F Minor, Op. 6: II. (Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be4d2c46d3595a654446e4f3136e2503bb456fe15e59daad20ffb3a6ecb3941. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:20:07Z), 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/DEN962334107.
Piano Sonata No. 1 in F Minor, Op. 6: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc7700caf1abb185bcb8831caf62a0e17cc56bd846ee81dbbeaa30270298009. 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/DEN962334108.
Piano Sonata No. 1 in F Minor, Op. 6: IV. Funebre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1fb0a7621c0208a1a4926e38aacd3d1109cb841bdf232fc716e292a3bec162. 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/DEN962334109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf911afa7b96d944d67c278e521d7dd00f0fe805b28d7a796d86b8c0ea5ca6948. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEN962334110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b931984b3d43a2fb823b5ea8d8d667e2bf7e4b0924210b9ffe7c2a54eed744. 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/DEN962334112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7922f0052932368b1ca6f9fbe23ca07568a19612dffcaa96865b1170ee96d58. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:52:51Z), 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/DEN962334113.
Keyboard Sonata in B-Flat Major, Kk. 544
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c852c7a4acb18dcfacbede0cc0732d0f6211bfbec895d4c5b807bbb3b7bed4. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEN962334114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a20a5b3ba7fc3c63cec923392f66507cf00b944fcfed027bdab0692934ae64e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:40:11Z), 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/DEN962334116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4620cea1f3b3b6722d46b8ea82e3a23371fd79906784d981f0be5e617df8c540. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEN962334118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca6bfcdc06df3c025b58023530659ea0073aca7b946ff40d6b5c61c1406f5e6. 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/DEN962334120.
EPILOGUE (Quasi Niente from Piano Sonata No. 1 in F Minor, Op. 6: IV. Funebre)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d56cb81da0cafd92335b3a19e37795f97681c33d6a06eb8cfb501c4dc2c540c. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962334121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ff008b4c8af9d7afd9ed32dac12a2c30e91ff398c7c49b41597dabbebcd57d. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T10:27:22Z), 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/DEN962334102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2602e3ec9f86fdbb1f5c9e74ec55ca44fca4bae9312b667876e9493930600ae0. 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/DEN962402103.
24 Préludes, Op. 11: No. 21 in B-Flat Major. Andante - Upright Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9bb4f8d492793916de6b5624afda9aa2a728fef43f13c56bd0cc705e967936. 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/DEN962334122.