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struct Blockchain { | |
var blocks = [Block]() | |
mutating func addBlock(_ data: String) { | |
guard let lastBlock = blocks.last else { fatalError("Failed to find genesis block.") } | |
let newBlock = Block(timestamp: Date(), data: data, previousBlockHash: lastBlock.hash) | |
blocks.append(newBlock) | |
} | |
} |
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