2NB () is a South Korean R&B duo formed by Friday Entertainment in 2006. The duo consisted of Heo Sol-ji and Kim Song-yi. They released their debut single "The First Fragrance" on March 31, 2006. The
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 0x0b2d1e29ef0c576998f109ad8ef7937707c3819a2f5ad9c855f93636ed9a07b4. 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/ba440295-b713-4585-864e-38b2c2767da8.json and https://artists.proofprofile.net/proofs/artist/ba440295-b713-4585-864e-38b2c2767da8.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 0xa3a7e9a71730c0651725e495aeea9c2c04645fe447ab753bef4008f6215d9df4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/KRZ291612302.
The Mending Of My Mind (Original Television Soundtrack) Pt.1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c21d01bc4c396af142239a0edfff9ad2ec49fb7ab56fbca40d5ea2312cadf0. 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/KRA341621244.
Second Love From The End (Original Television Soundtrack), Pt. 9 - You Are The One
너에게만 들려주고 싶어 (Original Motion Picture Soundtrack), Pt. 3
LALA (Live Again, Love Again) (Original Motion Picture Soundtrack), Pt. 2
라라 (Live Again, Love Again) Original Soundtrack - Pt. 2
LALA (Live Again, Love Again) 라라 (Original Motion Picture Soundtrack), Pt. 2
Love Interference Season2 연애의 참견 시즌2 (Original Television Soundtrack), Pt. 1
Love Interference Season2 (Original Television Soundtrack), Pt. 1
Love Interference Season3 (Original Television Soundtrack), Pt. 2
Love Interference Season3 연애의 참견 시즌3 (Original Television Soundtrack), Pt. 2
Love Interference Season3 (Original Television Soundtrack), Pt. 28
I'm Fine (Bike guys [Original Television Soundtrack] Pt.2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121751fe070e0bed937ee5edfbf091480f4d5630b2d097d2cfdd9e2c9db50cb6. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/KRMIM2103765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5e43e75992bcee96fcfcdae470fedfcf662b601ce2c27244f1be718e1520f2. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T15:53:25Z), 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/KRMIM2119445.
Love Interference 2021 (Original Television Soundtrack), Pt. 11
Love Interference 2022 (Original Television Soundtrack), Pt.1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcd14910bfc3fdb309a9806490821482e382168fee36725869fce4d75939751. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/KRMIM2260411.
Secret Lovers (Original Television Soundtrack), Pt.7
Sleepless Night (From "Beautiful Moment" [Original Soundtrack]), Pt.4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9317c0bacbdfeba9256cdb8cde56cecc4296e4d6ea307d12d82297a20938289d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/KRNAR2234204.
Love Interference 2023 (Original Television Soundtrack), Pt. 8
My Dearest (Original Television Soundtrack), Pt.9
Falling in Love (From "My Blue Summer" [Original Soundtrack])
I loved you enough to say something I didn't mean
Love Interference 2025 (Original Television Soundtrack), Pt.4
an alley (2NB X Desperate Ballad Project)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd453bdb719c725a8b4c85178f1cf7e3275c081bca2062799485b36eb565e75. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/KRB472501304.