"El Mal" () is a Spanish-language song featured in the 2024 French film Emilia Pérez. Written by Clément Ducol and Camille, with Emilia Pérez writer and director Jacques Audiard co-writing the lyrics
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 0x849a63dc7b67b89cbad61d6f175c2d762eebfa39c338c1e568d1678605f8e0ad. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/811ede63-dfc9-4efa-a1b2-df62dae2df8b.json and https://artists.proofprofile.net/proofs/artist/811ede63-dfc9-4efa-a1b2-df62dae2df8b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).