import { types } from "https://dotland.deno.dev/x/polkadot@0.2.38/mod.ts";
const { GenericExtrinsicSignatureV4 } = types;
x/polkadot/mod.ts>types.GenericExtrinsicSignatureV4#addSignature
import { types } from "https://dotland.deno.dev/x/polkadot@0.2.38/mod.ts";
const { GenericExtrinsicSignatureV4 } = types;