Capitalizations Index – B ∞/21M
bitcoin cannot be counterfeited because each coin’s ownership is validated by public-key cryptography and a decentralized ledger, making fake transactions mathematically and computationally infeasible.
A 51% attack occurs when a single entity controls most mining power, enabling them to manipulate transactions, double-spend coins, and undermine trust in a blockchain network.
bitcoin mining validates transactions and secures the network by solving cryptographic puzzles. Miners bundle transactions into blocks, earn rewards, and uphold blockchain consensus via proof-of-work.
Proof of Work is a cryptographic consensus where miners solve computational puzzles to validate bitcoin transactions. It secures the ledger by making tampering costly and ensuring network agreement.
bitcoin cannot be counterfeited: cryptographic keys, digital signatures and decentralized consensus ensure every coin’s history is verifiable, immutable, and protected by computational proof.
Miners verify bitcoin transactions by solving cryptographic puzzles – finding a valid nonce to meet a target hash. This proof-of-work secures the network by making block creation computationally costly.
A 51% attack happens when an entity controls over half of a blockchain’s mining/hashing power, allowing double-spends, transaction censorship, and chain reorganizations that compromise network integrity.
bitcoin transactions become irreversible once confirmed on the blockchain. After miners include a transaction in a block and additional confirmations accrue, funds cannot be reversed, ensuring finality and security.
Miners verify bitcoin transactions by validating digital signatures, checking inputs aren’t spent, assembling transactions into blocks, and solving a proof-of-work puzzle. Successful miners add blocks to the blockchain.
Proof of Work requires miners to solve difficult cryptographic puzzles to add blocks and confirm transactions. bitcoin uses PoW so altering history becomes computationally impractical.