CalcGasCost calculate gas cost given gas limit (units) and gas price (wei).

IsValidAddress validate hex address.

IsZeroAddress validate if it's a 0 address.

LogTopicHash generates the log topic hash given the event function declaration signature.

NewServiceHandle dsn demo http://127.0.0.1:8545 wss://mainnet.infura.io/ws/v3/xxxxxxxx https://mainnet.infura.io/v3/xxxxxxxx.

PublicKeyBytesToAddress returns the public address derived from a public key.

SigRSV signatures R S V returned as arrays.

ToDecimal wei to decimals.

ToWei decimals to wei.