Introduction to Blockchain Technology

Understanding the Basics and Applications

What is a Blockchain?

  • A blockchain is a distributed and open ledger
  • Consists of blocks containing information
  • Initially described in 1991 for timestamping digital documents
  • Became popular with the creation of Bitcoin in 2009

How Does a Blockchain Work?

  • Each block contains data, hash, and previous block's hash
  • Data depends on the type of blockchain
  • Hash acts like a unique fingerprint for each block
  • Changing a block modifies its hash and invalidates subsequent blocks

Securing a Blockchain

  • Proof of Work mechanism slows down block creation
  • Modifying a block requires recalculating proof of work for all subsequent blocks
  • Blockchain security also relies on distribution
  • Anyone can join the network and verify the blockchain

Uses and Applications

  • Blockchain technology has diverse applications
  • Used for cryptocurrency, medical records, digital notary, tax collection, etc.
  • Constantly evolving with new developments
  • Introduction of smart contracts for automated transactions

Conclusion

  • Blockchain technology offers secure and transparent transactions
  • Difficult to tamper with due to encryption and distributed nature
  • Continued advancements in the field
  • Explore implementation of a simple blockchain with JavaScript