Frederick II (; 24 January 171217 August 1786) was the monarch of Prussia from 1740 until his death in 1786. He was the last Hohenzollern monarch titled King in Prussia, declaring himself King of P
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 0x49e6cfd86ccf9deef079f235c0918f9d35c41e17730b1243399e14f86695ce7e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a8543f4-5be6-4546-a8ea-4be9d33cbb5f.json and https://artists.proofprofile.net/proofs/artist/9a8543f4-5be6-4546-a8ea-4be9d33cbb5f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Frederick Ii: Sinfonias / Flute Concertos
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 0x954100bc2fa3c0ee7f6de4ae36c61d2c6ce645e054cb2ebd2b1acfbcee41c998. 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/USB8U1009694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c24dd4bf04fbdaa5f26119f6c579c7aeb7e558b5a9e2e9a23951f54bbcef378. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USB8U1009695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414c2f6a35db9478f3e63ace39c082f481faef4a55ec8f95950d285973591a2a. 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/USB8U1009696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fd61196c5138d042d418187cc78fb0fa261391352ebd6bd8d525610a321dee. 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/USB8U1009697.
Flute Concerto in G Major: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fafc395920f5bafd91d25a54ff51ef060922e33969deb7942d4e78cb5e6fde. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USB8U1009699.
Flute Concerto No. 3 in C Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb65517f5abf712d3b3db332e76295eff6d796ec6cdc1ceb13bfbb70a4a79b9f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USB8U1009700.
Flute Concerto No. 3 in C Major: II. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b7d8515a540080067852761ce08fb7b579d858e766dd4b3db3454a746f279e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USB8U1009701.
Flute Concerto No. 3 in C Major: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b5a9dafab51e54c6ee2fadda5a1dccfbb6743f92472aba7fb65243a46a32c7. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USB8U1009702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2c2ec11b70b93108d9a2ecd6e5e94cb0e65104199d808368c1565e63cc33a1. 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/USB8U1009703.
Sinfonia in D Major: II. Andante (espressivo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2431dafbba0026ebf84a494e774eaff4ad26051531ea3c89537704c1fb57970b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USB8U1009704.
Sinfonia in D Major: III. Scherzando: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66922bdeb60fcc1a098736472cd8c72a5e756e500f43a7049142dcd7f0bd4219. 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/USB8U1009705.
Frederick II, King of Prussia: Rheinsberg Sonatas
King Frederick the Great of Prussia 7 Flute Sonatas
Broadway USA, Vol 8: Bobby Lee's Good American Musical Show
Frederick II The Great: Nine Sonatas for Flute & Harpsichord
Flute Sonata in E-Flat Major, No. 111 Catalogue of the King: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a118bd0046f4e0c8c05d02e08069a644bd3487f017d48cca7907b86899dc369. 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/NLY332103695.
Flute Sonata in E-Flat Major, No. 111 Catalogue of the King: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecddc4f5adcfab807d1ad417c9f4792f99a23c9cc261e2ab118d1d1de4ff685. 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/NLY332103696.
Flute Sonata in E Minor, No. 154 Catalogue of the King: I. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b92f6af56ed5ffd74b3754b21fce3c9cab17b1c76eb8f580648550419a7955. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY332103706.
Flute Sonata in E-Flat Major, No. 111 Catalogue of the King: I. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc209b03993c0a5642dace73e9cd8dce8da5f8c3c9ea872f3e7c0c78460f60e4. 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/NLY332103694.
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
Flute Sonata in C Minor, No. 114 Catalogue of the King: I. Grave e Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af439fce8ca080405a30e0e622f10034f36ba7ba40ef02b8233fa36b790cbd7. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/NLY332103697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e289ee60e4ada6fa865124f3a8a056f64aaaba6a98508de86d684692b39b8f. 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/USB8U1013089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac80748c57dfe131d04cf0dddd1aa76aa8fe867dc67ca0c8433f3cfcb888bb84. 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/USB8U1013087.
Berlin Radio Symphony Orchestra, members
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded80393d84739691f5689fc0fcc205d9c39082bdede6beff2edfbe3a39487b9. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USB8U1009934.