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Blockchains are exceptional in that, after a transaction continues to be recorded and confirmed, it may?�t be changed. The ledger only permits 1-way details modification.??дк?ий?е дл? ?ебе новий ??вен? ?андом? й ?озблок?й?е необмежен? можливо??? дл? ?ана??вBitcoin halving takes place close to