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 0x173602e727d3dcc0e3d543f1ecd8e65b6b585712c6783c9df7acb901f18c3741. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb3bc3ce-6978-4574-b5e1-7c77a05b7bef.json and https://artists.proofprofile.net/proofs/artist/cb3bc3ce-6978-4574-b5e1-7c77a05b7bef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Guided Tour of the Classical Era, Vol. 1
Keyboard Sonata in D Major, K.96/L.465/P.210: Allegrissimo
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 0x3ed49eff09574336adee3fa4b61a4fc0ee489ee0efecf8d4b478e283ae80c1e9. 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/HKI190649007.
Keyboard Sonata in F Major, Wq. 48 No. 1 "Prussian Sonata No. 1": I. Poco allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88d229dd99dd6d6b15e5d3a8affeb6f8ef5c10caa90a3cf32a964b9d826dd83. 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/DEAD61630001.
Keyboard Sonata in F Major, Wq. 48 No. 1 "Prussian Sonata No. 1": III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440bf22db6cece303df2ddb0fed06b1c9b7bb852b0d160d1ccca6036c1f5c578. 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/DEAD61630003.
Keyboard Sonata in B-Flat Major, Wq. 48 No. 2 "Prussian Sonata No. 2": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0245a20f1c1ca900961594d2374b7ec8b4c7ddf2e41d9e5a03b686566b2435bd. 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/DEAD61630005.
Keyboard Sonata in A-Flat Major, Wq. 49 No. 2 "Wurttemberg No. 2": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5ee84dc22cd13f657857fed048985d68071a77391c0e842c2af90ac3db886b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEAD61630029.
Keyboard Sonata in B-Flat Major, Wq. 48 No. 2 "Prussian Sonata No. 2": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e76e475eaa97715ef91a581d589a5fe8e93f77db39f76a9e12e459511a0122. 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/DEAD61630006.
Keyboard Sonata in E Major, Wq. 48 No. 3 "Prussian Sonata No. 3": I. Poco allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10c09bb463e73221f49a22c5de62cb3b46fd98f04a572900f6d4957a4fc60f5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEAD61630007.
Keyboard Sonata in E Major, Wq. 48 No. 3 "Prussian Sonata No. 3": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd66efaf31119481c4fee1dc4eb9dc6ec159372ed35893043645cdd1a8b9fe5. 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/DEAD61630008.
Keyboard Sonata in E Major, Wq. 48 No. 3 "Prussian Sonata No. 3": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3c78e48147ce50e911c7e5011d43523296394c7bdae8d05c546a8bd9d28fa3. 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/DEAD61630009.
Keyboard Sonata in C Minor, Wq. 48 No. 4 "Prussian Sonata No. 4": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a403eea46975b79783b0fcb4183daed4ffce49efda5cc0e57fd76f210fa20e3. 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/DEAD61630011.
Keyboard Sonata in A Major, Wq. 48 No. 6 "Prussian Sonata No. 6": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec55777f5b0dff1d23f03f2e66fdc5d48729871f8661a9db82532d49b05beb26. 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/DEAD61630017.
Keyboard Concerto in C Major, Wq. 112 No. 1: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a9d92b5c77e6fd296b3902d000d50839939936ca6ee7ba0643fbc0f8fe2089. 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/DEAD61630021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73c73c28012a077593791c83425980f19c6c7525201bc0a0dab06a6401aefef. 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/HKI199204013.
Sinfonia in F Major, Fk. 67: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb63b07ddbb3fd7e9336e6758984edadf02c48205375599fb43099c382cecf7. 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/HKI199204014.
Sinfonia in F Major, Fk. 67: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74944ab173db28687c838fbc2f20456b52e920fce888cbb69cd99cac41b9bc2d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKI199204015.
Sinfonia in F Major, Fk. 67: IV. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb2b38bf7a6d68e0a9ba91258c28a91da690cf08f3c98426eaaaba80f10a78e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/HKI199204016.