In Winchester v. Hackley, the Supreme Court of the United States heard a case involving two merchants from Virginia who had entered into an agreement to settle their debts with each other. The defendant, Hackley, argued that he was not liable for any debt because he had already paid off his portion of it in full. However, the plaintiff, Winchester, claimed that there were still outstanding balances due and sought payment from Hackley. The court found in favor of Winchester and held that although both parties may have believed they were settling all accounts between them at one time or another during their dealings together over several years prior to this dispute arising; since no formal written contract existed between them outlining such terms then only those payments which could be proven by evidence would be considered valid as part of any settlement reached between them. This ruling established a precedent for future cases regarding contracts without written documentation being enforceable under law if sufficient proof can be provided showing what was agreed upon by both parties involved in said transaction(s).

In Winchester v. Hackley, the Supreme Court was asked to decide whether a deed of land in Virginia that had been executed by an individual who was not legally authorized to do so could be enforced against the grantee. The majority opinion held that since there were no statutes or regulations governing such transactions at the time, and because both parties acted in good faith, it would be unjust for either party to suffer any loss as a result of this transaction. However, Justice Paterson dissented from this decision on two grounds: firstly, he argued that if one party is allowed to benefit from their own illegal act then it will encourage others to engage in similar activities; secondly he argued that allowing individuals who are not legally authorized to execute deeds of land undermines public policy and encourages fraud and deceitful practices which should never be sanctioned by courts of law.