verifyHeader.js

 export const verifyHeader = async (headerParts: any, body: any, public_key: string) => {
    const { signing_string } = await createSigningString(JSON.stringify(body), headerParts['created'], headerParts['expires']);
    console.log("recreated signing string:");
    console.log(signing_string);
    const verified = await verifyMessage(headerParts['signature'], signing_string, public_key);
    return verified;
 }