method GenericExtrinsicSignatureV4.prototype.signimport { GenericExtrinsicSignatureV4 } from "https://dotland.deno.dev/x/polkadot@0.2.24/types/index.ts"; sign(method: Call,account: IKeyringPair,options: SignatureOptions,): IExtrinsicSignatureParametersmethod: Callaccount: IKeyringPairoptions: SignatureOptionsReturnsIExtrinsicSignature