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 0x6dfa162279a3d90379221122c76bde57d262fe7553f36bad8e0a8965fa357d18. 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/ba326e01-b5ca-47a5-a04a-6122e065dc88.json and https://artists.proofprofile.net/proofs/artist/ba326e01-b5ca-47a5-a04a-6122e065dc88.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
Amadeus Chamber Orchestra of Polish Radio
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 0xa7cc94a840024a469b2720d5a052d31b37ee2714098263f1ccddcd631690addc. 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/HKI190712104.
Horn Concerto No. 2 in E-flat Major, K. 417: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc94a840024a469b2720d5a052d31b37ee2714098263f1ccddcd631690addc. 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/HKI190712104.
Horn Concerto No. 4 in E-flat Major, K. 495: Ii. Romance: Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4460f007003520b88774ae95011085239f3bc0b4709c2bb9536750bff2c28d52. 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/HKI190712110.
Horn Concerto No. 3 in E-flat Major, K. 447: Ii. Romance: Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642c7c5554944f46e076d2fe7fdbf924a3aea84bccc86d1942c221479eb91868. 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/HKI190712107.
Horn Concerto No. 1 in D Major, K. 412: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c202b083da48cb4b25a49478f16249ad81236d172e1e4ea8b3663710cdd822c. 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/HKI190712101.
Horn Concerto No. 1 in D Major, K. 412: II. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f8df5ed69aeb759b7c5ae8a59ad0b6a5db9f969366352babca75f62ba4d2c0. 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/HKI190712102.
Horn Concerto No. 2 in E-Flat Major, K. 417: I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd65f0ae5a3862bcac04356298f12e88b85afbee374fcf3575c2d14612a8839. 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/HKI190712103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc94a840024a469b2720d5a052d31b37ee2714098263f1ccddcd631690addc. 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/HKI190712104.
Horn Concerto No. 2 in E-Flat Major, K. 417: III. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc274b4617eb4c2960ce0468dc694402aca4469cb9aa5ce46f75156b2d7be2206. 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/HKI190712105.
Horn Concerto No. 3 in E-Flat Major, K. 447: I. Allegro (cadenza by J. Muzyk)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84e653df35627fd122d5eee92a67357cebe26de518ab33051e6d1e6d772f640. 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/HKI190712106.
Horn Concerto No. 3 in E-Flat Major, K. 447: II. Romance: Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642c7c5554944f46e076d2fe7fdbf924a3aea84bccc86d1942c221479eb91868. 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/HKI190712107.
Horn Concerto No. 3 in E-Flat Major, K. 447: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fcd21804c41b78daf988a8d00270db89681f46c7bb031f6bfb001c2718a301. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/HKI190712108.
Horn Concerto No. 4 in E-Flat Major, K. 495: I. Allegro maestoso (cadenza by J. Muzyk)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96be53d0791b7c3d72842764809a646e19474a5523de7d0b825bc8cf4d90adb. 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/HKI190712109.
Horn Concerto No. 4 in E-Flat Major, K. 495: II. Romance: Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4460f007003520b88774ae95011085239f3bc0b4709c2bb9536750bff2c28d52. 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/HKI190712110.
Horn Concerto No. 4 in E-Flat Major, K. 495: III. Rondo: Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0dbe97ade36fb4ee05961a70db4f997f071d44b6b0047b055b82d1a4d78cfb. 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/HKI190712111.