The bitcoin network works on the blockchain technology and it's secured, immutable, and decentralized, there are set protocols that guides this network and any alterations or non compliance to those security measures will automatically be rejected, everyone connected to the bitcoin nodes on the blockchain will understand this better that they have no chances of performing anything phishy from their end because it validate on everyone connected to that same network and nodes.


They solve the complex mathematical equations and the first to complete this task and get it done receives the block reward with bitcoin, they also monitors transactions and confirmed them base on those that conforms to the consensus.


Through the set protocols that must be in consensus along with every transactions that has been sent, else it will be rejected it not in consensus.


Your public keys are generated from your private keys, the public keys are your bitcoin address you can see and anyone can have access to seeing them but your private keys is what encode your access to the wallet.