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BlockChain Block1: A sent B 10 bitcoins Block2: B sent C 15 bitcoins Block3: B sent D 15 bitcoins Question: Before Block 1's transaction, B

BlockChain

Block1: A sent B 10 bitcoins

Block2: B sent C 15 bitcoins

Block3: B sent D 15 bitcoins

Question: Before Block 1's transaction, B did not have any bitcoins in his account. Highlight two issues that a crypto currency needs to address.

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