Nagasawa (written: 長沢 lit. "long swamp" or 長澤) is a Japanese surname. Notable people with the surname include: , Japanese sculptor and architect Hiroaki Nagasawa (born 1958), Japanese politician , Ja
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 0x7c3e5b89d0697b49137607160659662900a414e6afc98e74702f2e5a91af2c4b. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec28501a-1cb0-4b84-a99b-6029dfafd0c3.json and https://artists.proofprofile.net/proofs/artist/ec28501a-1cb0-4b84-a99b-6029dfafd0c3.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 0x3e0e00e53764f1a2bf5c51bbbe4e219e581ed73ce49c54146b6020d382c7c12c. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:41:39Z), 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/GX8LD2284315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2736afc449e5a6686b512d6f48fa9c2da201b59901d0f342b4ef859148dca07c. 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/GX8KD2388602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c68fb72fd3df50780fc60096dbd7f88ada6cd1e0a74617fa4e7f65ff6ae38de. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:09:54Z), 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/GX8LD2391448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9cbf25db0d6bcb16c9247fded1aa49ca297672e5cc0162a92397f7c4692762. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GX38U2333933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadea36e813bc8fa6a67d0577bd19c02445a1fdb628fb82eb5da1340a805278d. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T08:34:23Z), 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/GX4R52312671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee92c25257ef4eb829704823dd6b5caf15382cddcd72de62b6d2f4f88d9f2515. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/GX5MY2392128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7079e3bef4491891e906b937416959e301ad476a0fe43f2d1ed326ab2be5a207. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T06:56:21Z), 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/GX89G2437899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c5ad72a4f116af4f3d64cfdf6b78b76b74f88d6abf60102cf3bc0464c6fa17. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GX89G2437894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa2c4e4d918780c279d624d8d2626b1d034da88749c7b9f8f0f42d68b0345b4. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T07:26:26Z), 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/GX89G2433390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4b9ff2209a1b267de5027cabbd574978ef146fbe624e5e5c60e5e9e082d9dd. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T13:50:24Z), 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/GX89G2476466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7340171d1292b93b5da5a889614139d2240a73e85e2c437173f9cfc33a2bb5f. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:35:21Z), 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/GX89G2417170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47f8b60d586a79d3d01a0dc97f7d525f2c598e5c89d553ef5e3a46cf92842d2. 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/GX89G2489581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3fc91ec52c851f8ba82a86d9401f77d5509c365c7d5ae45d1e076798a4c195. 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/GX8LD2404907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223938556aeeed41b058fc512c8cc181722bacb022eeebe82e95153d3d3af4fb. 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/GX8LD2486582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fb849dec91dc0079cbff9b84175644e8a33f7b71fc2bd4dc01b1dd188e041a. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/GX38U2450586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8b934c7d4dea7e8b04bcf534cd2e75aa7cea1c507bb8e59de519b2853e16c1. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T07:27:05Z), 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/GX38U2445893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193a40b0ac8275e2b694da411f525666b32736bd15f3e65be906ea75232d0174. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:43:43Z), 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/GX38U2456606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7738b82c2a4013d490b3952fefdc1fe0cba63e8eb35cba6eb71ec7c713b6404. 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/GX38U2474104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334fcf0e494f4dc3ea5b523c31c10f7e4b304a3e0c6a7a0d0f7e51e18a0a7606. 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/GX4R52421757.