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faithfulness_score: Hallucinations (16/16): [1] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Blocks and Transactions** → Users create transactions (e.g., sending cryptocurrency) | [2] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Blocks and Transactions** → Transactions are grouped together into a **block** by a node (often called a miner or validator) | [3] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Hashing and Linking** → Each block contains a **cryptographic hash** of the previous block, its own data, a timestamp, and a **nonce** (a number used for proof‑of‑work) | [4] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Hashing and Linking** → The hash functions like a digital fingerprint; any change to a block’s contents would produce a completely different hash, breaking the chain | [5] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Consensus Mechanism** → Nodes must agree on which block is the next valid addition | [6] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Consensus Mechanism** → Common mechanisms → **Proof‑of‑Work (PoW):** Miners solve a computational puzzle; the first to find a valid solution adds the block and receives a reward | [7] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Consensus Mechanism** → Common mechanisms → **Proof‑of‑Stake (PoS):** Validators lock up (stake) tokens; a pseudo‑random algorithm selects a validator to propose the next block, and they earn fees/rewards | [8] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Consensus Mechanism** → Consensus ensures the network stays synchronized and prevents double‑spending | [9] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Distribution and Immutability** → The blockchain is stored on many nodes worldwide | [10] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Distribution and Immutability** → Once a block is added and enough subsequent blocks are built on top of it, altering it would require re‑computing the proof‑of‑work (or re‑staking) for that block **and** all later blocks on **more than 50 %** of the network—a practically impossible task | [11] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Distribution and Immutability** → This makes the ledger **immutable** and highly resistant to tampering | [12] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Smart Contracts (optional)** → Some blockchains (e.g., Ethereum) support **smart contracts**—self‑executing code stored on‑chain that runs when predefined conditions are met | [13] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Smart Contracts (optional)** → They enable decentralized applications (DeFi, NFTs, DAOs, etc.) without a central server | [14] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **Transparency and Pseudonymity** → All transactions are publicly visible on the blockchain, but participants are identified only by cryptographic addresses, not personal identities | [15] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → **In summary:** A blockchain is a network of computers that collectively maintain a continuously growing list of blocks, each cryptographically linked to the previous one | [16] A blockchain is a decentralized, tamper‑resistant ledger that records transactions in a series of linked blocks. Here’s a concise overview of how it works → Consensus rules determine which block is added next, ensuring security, decentralization, and immutability without a central authority