Ichillin' (; stylized as ICHILLIN') is a South Korean girl group formed by KM Entertainment. The group is currently composed of seven members: Jiyoon, E.Ji, Jackie, Joonie, Chaerin, Yeju and Chowon. F
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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d162cbccbe002a378287ca1dee696502be5d58785f8abc1dabe9d560b941ed. 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/76c0324f-8e22-496b-b921-4e5654832633.json and https://artists.proofprofile.net/proofs/artist/76c0324f-8e22-496b-b921-4e5654832633.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f18d9901f514f0e22deae1c8d8abf244a72402411f7e5f36a9a748515189c86. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/KRA382163530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6fbef0e946e0dcb6d087a2fea669995526ef32d55a06e149ae72e2020c99fd. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/KRA382204834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8be617d6efa51f390bd5a12d884e980e1f45a51b9a5f1c1968186e96ec306ae. 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/KRA382204835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75da991647d085fa078a8a41a891d47edf38a12b24fdde3668f12760719a2a3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/KRA382204836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be7cbfddda3b448ce71dbc0a9b1accfa4ce746c953dd17e7806bab7b4468429. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/KRA382318592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652531dd5603ab325b9712a5c9f4baed808b7c88177600582032788720edde99. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/KRA382208323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d172a2783c670f13cdf61127742755f2fe2d39473ab17f1339214e20cee4f9. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/KRA382301482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16e057c519d352e659f3ea883fd6c0eb298380098cfa5174d0ae57a6e02e513. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/KRA382301483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe495cda4b0a00c951deaba1e6140fea0840310aa4e8f34fef1984afb448d25f9. 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/KRA382324156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a4bd90b88d0e6abbb34501af8ad59c75f044ce5794d29e05e7de8f79bc2536. 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/KRA382400999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28672e15934758b1124093e07e60ea8d58f770418b53f45e6c2050855616043. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/KRA382401469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa860f1bc30a4b3977176bf303b97df9a6f342a425248b7bbd9ab3db374fb3be3. 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/KRA382406466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde26d80a2081065a0d6c8ff45b13cbbf8ae960887d60e348531db344b08e3314. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/KRA382406469.