Cryptocurrency - Quiz

The consensus mechanism used in Bitcoin is Proof of Work (PoW).

PoW is a consensus mechanism that requires miners to solve complex mathematical problems in order to add new blocks to the blockchain. The miners who solve the problems first are rewarded with newly minted Bitcoin as well as transaction fees. The PoW mechanism ensures that transactions on the network are verified and confirmed by a decentralized network of participants, and it provides security against attacks by making it computationally difficult and expensive to reverse transactions or manipulate the blockchain. However, PoW also requires a significant amount of computational power and energy consumption, which has led to concerns about the environmental impact of Bitcoin mining.

The two types of cryptography are Asymmetric and Symmetric.

Symmetric cryptography uses a single shared secret key to both encrypt and decrypt data. This key is shared between the sender and receiver of the data, and both parties use it to encrypt and decrypt messages.

Asymmetric cryptography, also known as public-key cryptography, uses two separate keys for encryption and decryption. One key, called the public key, is shared freely with others, while the other key, called the private key, is kept secret by the owner. Messages encrypted with the public key can only be decrypted with the private key, and vice versa. This allows for secure communication between parties without needing to share a secret key.

True.

Blocks are created in the blockchain network after consensus is achieved among network participants. Consensus is the process of verifying and validating transactions on the network to ensure they are accurate and legitimate. Once consensus is achieved, a new block is added to the blockchain, which contains a record of all the transactions that were verified during that particular period of time. This process is repeated continuously to create a chain of blocks that contain a complete history of all transactions on the network.

True.

Hash is commonly used in the blockchain network to ensure the integrity of data. A hash function is a mathematical function that takes an input (data) and produces a fixed-size output (hash). This output is unique to the input data and any change in the input data will result in a different hash value. In the blockchain, each block contains a hash of the previous block in the chain, which creates an immutable record of all the previous transactions. This ensures that the data stored on the blockchain cannot be altered or tampered with, providing a high level of security and integrity to the network. Additionally, hash functions are used to verify the authenticity of digital signatures, which are used to ensure the identity of the sender and receiver in a transaction.

False. The value of coins, such as litecoin and bitcoin, may vary across different exchanges that actively trade them due to various factors such as demand, supply, trading volume, and market conditions.

True

The statement is true. The computational power of the network adjusts the difficulty level of mining to ensure that new blocks are added to the blockchain at a steady rate. This is accomplished through a process called the mining difficulty adjustment, which makes it more difficult to mine new blocks as more computational power is added to the network, and easier to mine new blocks if computational power leaves the network. This adjustment helps to maintain the security and integrity of the blockchain network.

Bitcoin is an example of a public blockchain.