A blockchain is just a chain and a list of blocks. Each block, in the blockchain, will have its own digital signature. Each block doesn’t just contain the hash of the block, but its own hash in part, calculated from the previous hash Calculating and comparing the hashes allow us to see if a blockchain is invalid. We create a system that Allows users to create wallets and Provides wallets with public and private keys using Elliptic-Curve cryptography. Secures the transfer of funds, by using a digital signature algorithm to prove ownership and finally allow users to make transaction your blockchain