Callejeros () wasSE DISOLVIÓ EL GRUPO “CALLEJEROS” an Argentine rock band that gained international notoriety when the nightclub where they were playing, República Cromañon, was set on fire during on
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 0x35a1a583fd73ef370ba2e0ea2ea36b60b0ebb004ccd6bea944abe277d74b1536. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7da50940-2212-458a-b32d-8bdd1c6c53fe.json and https://artists.proofprofile.net/proofs/artist/7da50940-2212-458a-b32d-8bdd1c6c53fe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).