2BiC (; short for To Be Continued) is a South Korean duo formed by Nextar Entertainment in Seoul, South Korea. They debuted on March 14, 2012, with "Made Yet Another Woman Cry". Members Jihwan () J
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 0x1f2ee901e3cee3a4725ef2e067ae9efd0ccd4ca78ef8889ee47622e7dc37db9c. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab8ca118-4c6e-4fec-b364-2d9e56861fde.json and https://artists.proofprofile.net/proofs/artist/ab8ca118-4c6e-4fec-b364-2d9e56861fde.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 0x65ea1ec4415180f74437b6a4a0fe0e459b095f04b9ca20915cf8a205b698722b. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/KRA381201095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5340027a1d96d592914d60b37f1e542730f2484719214668abd1b43c9460a6d5. 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/KRA381202865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd890c27efdd95db214420d2eeba2358ff03f5c2a09e5072f0faa93512c2b5d91. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/KRA381202871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d8a75c4f2ff102bba7686df483fdf409d07701b2d7ee4bc40352b254ff4b3c. Chain 2 (Bitcoin): anchored in block 957579 (2026-07-11T14:35:38Z), 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/KRA381202875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63e2d7a80766ff9e29773f6e0208b538973e52263c7fad594e6ffe87b1f43da. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/KRA381204511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd10341be6eb9206b4621f97319645d8cf2b5b6eb06cbf5f55575b7d51b7282. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/KRA381204512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e896e38786452c301b4a2dfa5949e93e859913a9800b93913c1daf277d91896. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/KRA381204515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91164ef1d5900b0aac65d02c3199517ebbbb56caf63170b072cacaaa702712d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/KRA381204518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7909fa4b9e11b93be1c402423c01d66378cf3cd8ba8f9dce6c8c4a24861b43. 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/KRA381204522.
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
굿닥터 (Original Television Soundtrack) Part. 2
Doctor Good (Original Television Soundtrack) Pt. 2
굿닥터 (Original Television Soundtrack) Pt. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8778fe7af20494571538ac28d7228daffb51dfbfab913cd0f20b0b728c6f47a. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/KRA381206756.
2nd Mini Repackage Album 'Walk backward'
Good bye Mr. Black (Original Television Soundtrack) Pt. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d09857a151909ed4fb7f1b96e479cb12ce9478a3d191f08150caca40159007. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:29:30Z), 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/KRA381600844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062886987f9af60fdffe8cc9d0eed8dc6490e7928d5b01bb79386e9133e62d6e. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/KRB471601264.
Are You Human? 너도 인간이니? (Original Television Soundtrack) Part.4
Are You Human? (Original Television Soundtrack) Pt.4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5704465ca35a61438f036e67eaebf0908da87566a5a7a7628102136de8c6df. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:42:57Z), 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/KRMIM1804263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd175cb1c092e056636b26b535e02915233ad7047312e09333747405a7e5227ed. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/KRB471801242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd175cb1c092e056636b26b535e02915233ad7047312e09333747405a7e5227ed. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/KRB471801242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657ecfc4cfdde189546de8d9b2e221322038de15e2eb7797d21362f10449240b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/KSA002300974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58534b01c6c8cf8fb6bb6a6c919b5030a33f59c25bdb74e6f38f384e26964b12. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/KRMIM2408532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed35592d5ae8ff6b131cc9328d183f5d9bdbeeec905c42f3c92113fd3e96869f. 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/ZZA0P2410534.
Goodbye Mr. Black (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e32b441701cb047a030df65ad7d7289e8d0ec69a2d38defad59f1ab4e16777. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/KRA381600975.