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Questions and Answers

What is the primary function of a Bitcoin address?

  • To encrypt transactions
  • To serve as a hash of the public key (correct)
  • To identify the owner of a Bitcoin account
  • To store public keys securely
  • What does the OP_CHECKSIG opcode do in Bitcoin Script?

  • Verifies the signature of a transaction (correct)
  • Generates a new public key
  • Hashes the current stack top
  • Duplicates a stack entry
  • Which of the following is NOT a property that blocks must have for them to be relayed?

  • The block must have unique opcodes (correct)
  • All transactions within the block are valid
  • The block is included in the longest chain
  • The block contains a valid hash
  • What is the purpose of using a hash pointer in the Bitcoin ledger?

    <p>To quickly reference previous blocks</p> Signup and view all the answers

    How is the time it takes for 95% of nodes to see a new block measured?

    <p>Propagation latency</p> Signup and view all the answers

    Which operation does the opcode OP_EQUALVERIFY perform?

    <p>Compares the top two items on the stack for equality</p> Signup and view all the answers

    What is the total limit of bitcoins that can ever be created?

    <p>21 million</p> Signup and view all the answers

    What does a joint transaction in Bitcoin indicate?

    <p>Transactions that require multiple signatures</p> Signup and view all the answers

    How often is the rate of block creation adjusted in the Bitcoin network?

    <p>Every 2016 blocks</p> Signup and view all the answers

    What is the defined structure of a Bitcoin transaction primarily composed of?

    <p>Scripts rather than signatures and public keys</p> Signup and view all the answers

    What ensures that someone cannot spend bitcoins they do not own?

    <p>Public key cryptography</p> Signup and view all the answers

    What happens to the reward for miners approximately every 4 years?

    <p>It decreases by 50%</p> Signup and view all the answers

    What is used in Bitcoin to create an anonymity feature?

    <p>Public and private keys</p> Signup and view all the answers

    Which mathematical algorithm is assumed to correspond to a Bitcoin address?

    <p>RSA</p> Signup and view all the answers

    What is required from Alice before she sends Bitcoin to Bob?

    <p>Bob's address and amount to transfer</p> Signup and view all the answers

    What describes the nature of Bitcoin transactions in relation to user identity?

    <p>Transactions do not disclose user identity</p> Signup and view all the answers

    Study Notes

    Creating Bitcoin & Regulations

    • Bitcoin supply is limited to maintain currency value and prevent malicious currency generation.
    • New Bitcoins are generated during the mining process, when a miner discovers a new block.
    • Block creation rate is adjusted every 2016 blocks to regulate a constant 2 week period.
    • Bitcoins generated per block decrease geometrically with a 50% reduction every 210,000 blocks.
    • Total limit of Bitcoins is slightly less than 21 million.
    • Miners will receive smaller rewards over time as the amount of Bitcoins generated per block decreases.

    Bitcoin Transactions

    • Bitcoin uses public key cryptography to verify digital signatures.
    • Each user has one or more addresses with associated public and private key pairs.
    • To send Bitcoins, the sender adds the recipient's address and transfer amount to a transaction message and signs it with their private key.
    • The sender broadcasts the transaction message to the network for all users to verify.

    Bitcoin Anonymity

    • Bitcoin is permissionless, meaning users do not need to register their public and private keys.
    • Transactions are linked to Bitcoin addresses, not usernames or identities.
    • Bitcoin addresses are mathematically derived from public keys using algorithms like RSA.
    • Users can have multiple Bitcoin addresses, making it difficult to track ownership and balances.

    Bitcoin Script

    • Bitcoin uses a script to verify transactions instead of just digital signatures and public keys.
    • The script is designed to be efficient and secure, with a stack-based architecture for evaluating expressions.
    • Opcodes like OP_DUP, OP_Hash160, OP_EQUALVERIFY, and OP_CHECKSIG help validate transactions.

    Bitcoin Transaction Details

    • Transactions must meet certain criteria to propagate through the network, including no conflicts, double spending, or special scripts.
    • Block propagation latency is the time it takes for a new block to reach a majority of the network.
    • Bitcoin transactions are designed to be secure and reliable, with robust consensus mechanisms and security features.

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