The identifier where a transaction is sent. Derived from a user’s public key, which originates from the private key by asymmetric key cryptography. In Ethereum, the public key is 512 bits, or 128 hexadecimal characters, and is hashed (i.e., uniquely represented) with a Keccak-256 algorithm, which transforms it into 256 bits or 64 hexadecimal characters. The last 40 hexadecimal characters are the public address, which usually carries the prefix “Ox.”  (Harvey, Rmachandran, & Sandoro, 2021)