There are only two cardinal rules of cryptocurrency that arise directly from public key cryptography. As you probably know, modern cryptography is based on paired keys, a public key and a private key. Because of the blockchain, public keys and incidentally wallet addresses should be verified before sending. Due to the principle of immutability and the lack of a trusted intermediary, there’s no way to contest or reverse a transaction once it’s been made.The second law is simply that the owner of the private key is the owner of the wallet and all the funds therein.