Isato Nakagawa (January 30, 1947 – April 7, 2022), was a Japanese guitarist, teacher, composer and arranger specializing in the fingerstyle technique. Nakagawa has released almost 25 albums since the
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 0x509e5aa71dbec49dd19998b84f0df0db39efdca07031b986a44f09ef21d7946a. 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/dae891fb-26c6-46d8-8d32-433627e14a2a.json and https://artists.proofprofile.net/proofs/artist/dae891fb-26c6-46d8-8d32-433627e14a2a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151d2ca6182bb11dbea7b36258ceee9401d55f35e56cf4bb38c7713beb28248f. 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/JPSR07301710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6491eec5eae08968b0487b17f65ebd681fcdc05dee1ce5a7df503168b38d1c4. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:42:36Z), 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/JPSR07301750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e842a88954cfa40dd5a60ebad107b8229dc881d19a09d1f411fc6d0de62fab. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/JPSR07301800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7676887068d5a20cbc2de8aff8059e2f10459a36ccddedcc7ba35c5afeb3d16. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/JPSR07708070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a59cde32b16d935f6d48736b521fec456546f350e304a16501eec94222d00b. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/JPSR07708080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885e89f30bf1ce8f0b279635d4f4d82e408d7168e3d7c124022ea37fa1f78d73. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:20:38Z), 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/JPSR07708090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3841b8cd026010a77c2a3bdae765d71a006983dbdd929d10d787e77a409a96. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/JPSR07708100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e67a622a722a3ab37d42426e24114fa850fa86e83440e7b72bd4ce33c42acf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/JPSR07708150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6c8cb03a8bd3d286fa4831d557747e637f7dff087be863cecf04ae8d53819b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DED339913310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbf59b8422e93062907072602c6302a8c5e90a9a18154a8b797bebb5654c9f9. 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/DED339913330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f46100c418e427b1f2fbe8261c51f09b5e4fd0d2c5fc1f305149288a2e0fe4e. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/DED339913350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70463c556f01082aa995b45ac8dcb9eda3434b457c537124307967cf29c03a75. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/DED339913360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c49888067c6235c2ff49111c251de28abdc64911edfe34376310341d3ce878f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DED339913390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec254d59686a6b4a3130ffd588d462cb12bf739c0567eda590e51617e269b805. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DED339913400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c06f4373080f4d9d5aa9c8aeee556b2b1e598536eba81feabd3ca2f983064d. 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/DED339913430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65da63e51bc169eee37a18343eb1318d9acf9ed897e808c678a04f128945c4ae. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DED330122060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d5adaeec9843cf0f7eb80ad4a22dec4509bd819f3b9baae5c5cc16cc8c2a92. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:06:07Z), 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/DED330122090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf19cc6871ece1f7a8bfcb993223260230de0ebb043201db26d5317cb0ac8c23. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:53:00Z), 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/DED330122110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7f5ec613e8f1a2676a0376e128afb70c21b9531052ec8c22e2b43896806838. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:34:07Z), 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/DED339706580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be3c33a24527f094deec46b9d14035843c2aa91c983c0d48df1ddc45a7d3b94. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/DED339706590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b64f86f6a495d2425f8fe872ac8d17de674547b20fb5612ba5006ce6707bc9. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/DED339706610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52fdb3ecf4c087dbd35feb421c5732d6c90a0eae4b8f1b1d80511fad4baf1af. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DED339706630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757690e741acf02e3419961f6146436e3eb70bc6002a00b25e743cdbce76db55. 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/DED339706680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fc53a518de98f816362bd9e0b2766236794816f4447449c8acb013e7d22d69. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/DED339706690.