One Sunny Day () is a 2014 South Korean web series that aired on Line TV from December 19, 2014 to January 10, 2015 for 10 episodes. It was only available on Line TV to Thailand audiences and was not
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 0x560a0bdea138ff6ecdd382db18320e5504146436f61485d29c3f4b9a170f0230. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aee76712-f3c8-4d65-a5d4-811de135dfae.json and https://artists.proofprofile.net/proofs/artist/aee76712-f3c8-4d65-a5d4-811de135dfae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).