Epex (; stylized in all caps) is a South Korean boy band formed and managed by C9 Entertainment. The group consists of seven members: Wish, Mu, A-Min, Baekseung, Ayden, Yewang, and Jeff. Originally a
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 0x590ed1f349fb198a338711029d4dc11769bc9f8f638acd113ec9c103b3a1c7e1. 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/e05311a2-608f-442a-9dcd-0c4a6fc5831d.json and https://artists.proofprofile.net/proofs/artist/e05311a2-608f-442a-9dcd-0c4a6fc5831d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1st EP Album 'Bipolar Pt.1 Prelude of Anxiety'
2nd EP Album ‘Bipolar Pt.2 Prelude of Love’
3rd EP Album Prelude of Anxiety Chapter 1. ‘21st Century Boys’
EPEX 4th EP Album Prelude of Love Chapter 1. ‘Puppy Love’
EPEX 5th EP Album Prelude of Love Chapter 2. 'Growing Pains'
EPEX 6th EP Album Prelude of Anxiety Chapter 2. ‘Can We Surrender?’
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 0xe19be45e5714287488f84cbb4c43149255e9ce0b9bd34e671606d31bde9a3440. 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/KRA382320804.
EPEX 1st Album Youth Chapter 1 : YOUTH DAYS
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a9a4cf1e3ef6aba5c2d5c804e28efe3412e9dab14fcf3bfb550fa7641d7b61. 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/KRA382402093.
EPEX 2nd Album Youth Chapter 2 : YOUTH DEFICIENCY
EPEX & joan 1st Digital Single ‘so nice’
EPEX 3rd Album Youth Chapter 3 : ROMANTIC YOUTH