Just B () is a South Korean boy band formed by Bluedot Entertainment. The group consists of six members: Geonu, Bain, Lim Ji-min, Siwoo (formerly known as JM), DY, and Sangwoo. History 2019–2020: Pre
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 0xca995907a85d4df6da06c8721f0f7e59ed5de6b65e48eb8a683eaa1c056e5108. 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/eb4d376d-3b8a-4d4c-b388-2a4dd6f76279.json and https://artists.proofprofile.net/proofs/artist/eb4d376d-3b8a-4d4c-b388-2a4dd6f76279.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 0x22c0f9771fc5dd4c18e94a8d63084becb2e98d2b12e113e37dd2b5c4ebc0c99a. 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/KRMIM2142354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad6f1a43875806b366d99c4631084dc56df3cda26657da6ed9ef1b95d59c399. 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/KRMIM2212183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea700900c40d572f34a218dba87d4ef6515c06f2ddc7f68999d940b3c501c51. 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/KSA012213792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3ed17961d5b8842295a1136033010cd3f2bd515ffeec24e3754c410cbb2512. 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/KSA012245007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9e276696e23b057b0dc472e9e7ae8bf52e47a6e2153dbca61fd9ffd3a4535b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/KRA382319792.
CEO-dol Mart (Original Television Soundtrack) Pt. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060d65f88cfa0ac1eb0bf5d282d4c23916853d78824cada130d8f66a0d11a2b3. 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/KSA012298469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3ed17961d5b8842295a1136033010cd3f2bd515ffeec24e3754c410cbb2512. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/KSA012245007.
Coming Home (Acoustic English Ver.) (Digital Only)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e30365e139f8e44f5fa4800b362d812282bb07dbf6a787b35a4be4dc53efaf6. 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/KSA012278132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625de1090eec46f3cc1d5a7c84f006f6e332a65d4699175d7044d26cf161eff8. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/KSA012291385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312fd16ff8122d8da1acfee9cf9fc82a83663477747728a2d7637041ef5b359c. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/KSA012323439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa0982b3394ccb047ef90e5ace4cc649f02dc17e7b0ce1f2e16a7ec407978df. 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/KSA012369389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d500f3e8103c95df323a4ab53d272560f2c2baa082db9342b387402f594697. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/KSA012377289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1bd2d8f3e3d7aaa34aa999b4c445c5ba38298bf4973d715bead60ec5b6501c. 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/KSA012377290.
CEO-dol Mart (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060d65f88cfa0ac1eb0bf5d282d4c23916853d78824cada130d8f66a0d11a2b3. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/KSA012298469.