The transaction with the most confirmations will be added to the blockchain if both transactions are simultaneously fetched from the pool for confirmation, while the other transaction will be dropped.
Due to the aforementioned, any node joining the network will be confronted with numerous blockchain branches, many of which may be the same length, and will not be able to identify the main chain. As a result, the node risk being duped into adopting a malicious chain. The Genesis Block, sometimes referred to as Block 0, is the initial block in a blockchain, and it is where all subsequent blocks are added. Since every block refers the one before it, it serves as the ancestor to which all others can trace their descent.
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