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PROFESSIONAL TRADER SCREEN SETUP - FULL WALK-THROUGHThis study analyzes and evaluates double-spend attacks on Bitcoin, with a specific focus on threats related to zero confirmations and instant. In this paper, we revisit the security of Bitcoin blockchain by incorporating the network synchronization into the security model and evaluating. Users execute payments by digitally signing their transactions and are prevented from double-spending their coins (i.e., signing-over the same coin to two.