Blockchain
A digital list of transactions stored across many computers.
What is a blockchain?
A single value that represents all transactions in a block.
What is a Merkle root?
A fixed-length string made from data.
What is a hash?
A system where computers solve puzzles to add blocks.
What is Proof of Work?
A digital way to prove a message came from you.
What is a digital signature?
The most famous blockchain used for digital money
What is Bitcoin?
Transactions are grouped and hashed together in this structure.
What is a Merkle tree?
The same input will always give the same result.
What is a deterministic function (hash property)?
People who solve the puzzles and add blocks.
What are miners?
A secret key used to create a signature.
What is a private key?
Blocks are connected in order using this, making a “chain.”
What is linking blocks together (or cryptographic linking)?
It helps quickly check if a transaction is included in a block.
What is verification?
Changing even one letter changes the output completely.
What is the avalanche effect?
Miners are rewarded with this for their work.
What is cryptocurrency (like Bitcoin)?
A key others use to check your signature.
What is a public key?
Because many computers share it, no single person controls it.
What is decentralization?
If one transaction changes, this value also changes.
What is the Merkle root?
It’s very hard to reverse a hash back to the original data.
What is one-way function?
The puzzles require a lot of this resource.
What is computing power (or energy)?
It proves a transaction is real and not fake.
What is authentication?
Once data is added, it’s very hard to change or delete
What is immutability?
It combines many hashes into one top hash.
What is a Merkle tree (or root process)?
Used to secure passwords and blockchain data.
What are hashes used for?
It helps keep the network secure from attacks.
What is the purpose of Proof of Work?
Only the owner of the private key can do this.
What is sign a transaction?