Blockchain

Computational thinking, problem-solving and programming

A block chain is a growing list of records, called blocks, that are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a Merkle tree).

A blockchain is a decentralized, distributed, and oftentimes public, digital ledger that is used to record transactions across many computers so that any involved record cannot be altered retroactively, without the alteration of all subsequent blocks

Videos

The video below is easily the best video explanation I have found explaining blockchain. I would suggest you watch it several times.

The video below is a very good high-level overview of blockchain:

See also

• 51% attack
• Block
• Block header
• Candidate block
• Collision resistance
• Cryptocurrency
• Cryptographic hash
• Determinism
• Digital signature
• Distributed consensus
• Double-spend problem
• Entropy
• Genesis block
• Immutable transactions
• Key pair generation
• Ledger
• Merkle proof
• Merkle tree
• Miner
• Mining
• Nonce
• Non-invertibility
• Non-repudiation
• One-way function
• Proof of work
• PuTTYgen
• Self-referential data structure
• SHA256
• Takeover attack
• Transaction pool

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