Project 7 () is a 2024 South Korean boy group reality competition survival show created by JTBC. It followed the process of creating a new global boy group. It premiered on JTBC on October 18, 2024, 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 0x61ef8fbc38bae94bc1395022f5ac3a2cc5dd286468b9a0eb95f4fc89c0050964. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ecc8410-c567-47cf-91e3-79b3192269ab.json and https://artists.proofprofile.net/proofs/artist/7ecc8410-c567-47cf-91e3-79b3192269ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).