What role does Cryptography play in Blockchain development?

In fact, Cryptography is the very basis on which Blockchain development for ensuring security and integrity of transactions is based. Public-key Cryptography lets users create digital signatures that prove the authenticity of the transactions taking place. Hash Functions link blocks together in a way that tampering with data would be practically impossible to do without being noticed. Various encryption techniques have also been deployed to secure sensitive information that the Blockchain holds, making sure access is granted only to those authorized to view or use such information.