"Main" goes in the blank. For example in C++ all of your code goes in the main function.
In a block in a blockchain, a resource which represent the transactional data, sender, receiver, and number of coins is: A. data.
<h3>What is a blockchain?</h3>
A blockchain can be defined as a digital and dynamic financial system that is designed and developed to be used in recording and maintaining transactions that are associated with or made through the use of a bitcoin, usually as a database containing various set of data.
In this context, we can infer and logically deduce that data is a resource that typically represent all of the transactional data, sender, recipient (receiver), and the number of bitcoins in a block in a blockchain.
Read more on blockchain here: brainly.com/question/25700270
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