import { GenericExtrinsicSignatureV4 } from "https://dotland.deno.dev/x/polkadot@0.2.23/types/index.ts";
x/polkadot/types/index.ts>GenericExtrinsicSignatureV4#toU8a
import { GenericExtrinsicSignatureV4 } from "https://dotland.deno.dev/x/polkadot@0.2.23/types/index.ts";