How transaction manipulation handles in Blockchain?

How transaction manipulation handles in Blockchain?

I'm new to Ethreum and would like to understand few concepts in a detail.
After reading about basics of Blockchain, one thing is unclear to me about tx. manipulation.

For instance, A has some (i.e: $10) money and A is sending half($5) of it to B. but C manipulate that transaction before going to Blockchain and set $10 instead.

Now, A wanted to send only $5, but some how A's account will get empty since miner will check A has enough balance or not.

How Blokchain resolves this type of scenario?

https://ift.tt/2mPbrg1

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