$BTC The Bitcoin whitepaper by Satoshi Nakamoto introduced Bitcoin (BTC) as a peer-to-peer electronic cash system that lets people send value directly without banks or middlemen. It solved the long-standing double-spending problem — where digital money could be spent more than once — by using a decentralized network with Proof-of-Work (PoW) and cryptographic timestamps. Transactions are bundled into blocks, each linked to the previous one through hashing, forming a secure blockchain that can’t be altered without redoing all past work. This design paved the way for decentralized money that is transparent, secure, and trustless, laying the foundation for all modern cryptocurrencies.

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