"Loco Loco" is a song by Serbian girl group Hurricane. The song represented Serbia in the Eurovision Song Contest 2021 in Rotterdam, the Netherlands. The song qualified from the second semi-final on 2
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 0x9ad9f0f125c39d21c0fb8b245c662dc8c4f32581f109907a537f98227efd3210. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/950983ab-1524-49f7-9755-5ce32b9b3c99.json and https://artists.proofprofile.net/proofs/artist/950983ab-1524-49f7-9755-5ce32b9b3c99.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).