Mortem is a death metal band formed in 1986 in Lima, Peru. Biography Mortem is one of the oldest and most celebrated bands from the obscure Peruvian death metal scene. Founded by Fernán Nebiros and 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 0x46b5eb1405b795464591f0c1abb8a88fd9931ea7a6e2470e93f1bc33654d6ab0. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a918c998-8ebd-486d-a2f2-1ca4c36f1705.json and https://artists.proofprofile.net/proofs/artist/a918c998-8ebd-486d-a2f2-1ca4c36f1705.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).