Theoretical Background: Proof of Work

Application: Hashcash

idea: user needs to show some work to use a service


key features

  • log (aka ledger, dt. “Kassenbuch”), i.e. records over time
  • immutable
  • distributed
  • “trustless”, i.e. w/o trusted third party

Further Reading

Example 1: Bitcoin

visit Bitcoin’s blockchain

Example 2: Ethereum

visit Ethereum’s blockchain

Resources and Further Reading

- The Blockchain Explained to Web Developers by Francois Zaninotto (3 parts)