NiziU (; ) is a Japanese girl group formed by JYP Entertainment and Sony Music Entertainment Japan through the reality-survival program Nizi Project (2020). The group is composed of nine members: Mako
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 0xa20222cafe2d93f0a539119218bf1ed14b01d1f68de69b0a0e7e2b244e5739e5. 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/466219a1-8e7b-4d78-bdd6-56b9db2220c8.json and https://artists.proofprofile.net/proofs/artist/466219a1-8e7b-4d78-bdd6-56b9db2220c8.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 0x172bf7c5aea8df98375a4f1446d9b6de2d254cd594315a792dc04a3466e9903c. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T11:04:17Z), 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/JPU982102096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996c42e0ad9506baaa96c719b6b6c2675404ee49a32b0234dfb2763369c1a2c3. 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/JPU902300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbcc77fb7ba34c2f5b703ab36d242d51e445c45248c46f387846f4c83543f87. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:28:50Z), 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/US5TA2300166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdbd728f07c6b934fcc4bbff3888f9617c940753f123a559c7dbf588ccab356. Chain 2 (Bitcoin): anchored in block 956426 (2026-07-17T08:57:25Z), 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/US5TA2300168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f5e60b7419bb23d6e8cb72e48e07bd21e6fdfe794722c1eb53bf4074313acb. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/JPU902400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6a451dc670e7d12bdce331c3d7d10eb8a78d961418620c3050e46fedb865d3. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/JPU902401940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24613436e024035f8c725e3f21fc19935beee3eeb169c89cab2d049b28cd62c. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:14:45Z), 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/JPU902401942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1142fac98c0e804d4969eaf0fbcd04acfddccd537f502c92a66ad497deaab4e2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/JPU902401943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6a451dc670e7d12bdce331c3d7d10eb8a78d961418620c3050e46fedb865d3. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/JPU902401940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042b1b9b077deda55ca8983a0355ee8aebd275a3edbb1e31c0f23e54698d076b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/JPU902401944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012daa9daceaa56509cdafc531282aa04486700c2b2d44e6b359201cedb6945b. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/JPU902401945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d25d281f85977212b1c50721a8c4a37e893d5d233185dca58469a109091d8c4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPU902404058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6da8aa441c8b00bae27ace02675de6bc9990c9849c377d1beabc21833a7128c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPU902404356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23200275565492c9ad72c69e7d464ffc896d4092296645b8e096cdaa21677064. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/US5TA2500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4493fd77195f170f6f9d1f03e7bff570c04998d834ccfcd0c15ee78594faf7. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/US5TA2500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0637c604d875091a2a3a98ce4f27b5621d12ab5b8d3d77b66829179547ad710. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPU902501853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc835fc217742cdc6ab8ae336a3c56d486504994c5d8ff4fb73ae76a01b5cf157. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/JPU902501854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35848ec8e0fe5dd5722981c1cd147b2cf8fcd8b7fdb4cfedb79578c0f4d7f637. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPU902503602.