Download genesis file, if you need. Also be sure to verify the genesis sha256 checksum before starting your node.
Genesis Info
Instructions with terminal
wget -O $HOME/.core/coreum-mainnet-1/config/genesis.json "https://snapshot-at-1.genznodes.dev/coreum/genesis.json"
shasum -a 256 $HOME/.core/coreum-mainnet-1/config/genesis.json
## output
6eaef75a70af041adbe4970b6e260481eb9e885b629513b34750d3bf387db984 ~/.core/coreum-mainnet-1/config/genesis.json