A brief definition of blockchain technology and the role in cryptography

This reference guide breaks down the twelve core cryptographic principles that keep blockchain networks secure and tamper-proof. For each key term—ranging from hash functions and public/private key pairs to Merkle trees and Proof-of-Work—this document provides a clear definition, explains its specific role in blockchain, and illustrates its real-world application.

22 Oct 2026 0 29

Overview and History of Blockchain

15 Oct 2026 1 76

Exercise for Reviewing Python programming

In the exercise below: 1. Create a variable sentence and assign a sentence of your choice to it. 2. Find and print the length of the sentence. 3. Convert the sentence to uppercase and print the result. 4. Replace a specific word in the sentence with another word. 5. Count and print the number of occurrences of a particular letter in the sentence. 6. Create a new variable reversed_sentence and assign the reversed version of the sentence to it. 7. Print the original sentence and the reversed sentence.

15 Oct 2026 2 113