When you purchase bitcoins, they are storedin a bitcoin wallet. A bitcoin wallet is a digital tool that stores the cryptographic keys necessary to access and manage your Bitcoin holdings. It does not store physical bitcoins but instead holds the keys to access them on the blockchain. Key Details: * Functionality of Bitcoin Wallets: Bitcoin wallets manage private and public keys. The private key is required to sign transactions, while the public key generates addresses that allow for receiving bitcoins. Without access to the private key, the user cannot spend or transfer their bitcoins. * Types of Bitcoin Wallets: Wallets can be software-based (such as mobile or desktop apps) or hardware- based (physical devices like a Ledger or Trezor). There are also online (custodial) wallets provided by exchanges, but these still technically store bitcoins within a wallet. * Not a Physical Storage: Bitcoins do not exist as physical files or objects. The wallet is an interface that interacts with the blockchain, where the actual records of ownership are maintained. Thus,D. In a bitcoin walletis the correct answer, as bitcoins are stored in wallets that hold the keys necessary to interact with the Bitcoin blockchain.
Question 17
Self-executing computer programs which facilitate transaction automation and eliminates the need for intermediaries are called what?
Correct Answer: D
Smart Contractsare self-executing computer programs that automatically enforce, verify, and facilitate the terms of a contract when certain conditions are met. These programs run on blockchain networks and eliminate the need for intermediaries by automating transactions based on predefined rules coded into the contract. Key Details: * Automation and Trust: Smart contracts are crucial in blockchain technology because they enable trustless transactions, meaning parties can transact directly without relying on intermediaries. The code controls the execution, and transactions are transparent and irreversible. * Use Cases: Smart contracts are foundational to decentralized finance (DeFi) applications, supply chain management, digital identity, and more. They facilitate various operations such as lending, borrowing, insurance, and automated asset transfers. * Example in Ethereum: Ethereum popularized smart contracts by providing a platform with Turing- complete scripting capabilities. This allowed developers to create sophisticated decentralized applications that execute on the blockchain. In conclusion,D. Smart contractsis the correct answer as it refers to the technology that automates transactions and eliminates the need for intermediaries.
