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How can a transaction be spent unless it is written in the blockchain?

I think you're looking at a chain of unconfirmed transactions. Since transactions are immutable¹ after they are submitted to the network, you know what transaction outputs will be created before the ...
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How can a transaction be spent unless it is written in the blockchain?

How it this possible for coin to be spent before the transaction is written on the blockchain? It isn't possible. The first transaction ...
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