Constant FAILED_BEEFY_TO_ETH_ADDRESS 

pub const FAILED_BEEFY_TO_ETH_ADDRESS: [u8; 20];

Sentinel returned by BeefyEcdsaToEthereum when an ECDSA public key cannot be converted to an Ethereum address. Both producer and consumer must reference this constant so the two ends of the conversion can never drift to different sentinels (see Pallet::compute_authority_set, which counts failed conversions by matching against this value).