In assymetric cryptography how and when the sender will share the public key with the receiver

Question

Can someone with an example, tell me In asymmetric cryptography how and when the sender will share the public key with the receiver? Thanks in advance

Answer 1

Consider this example:

• Suppose Bob wants to send 1 bitcoin to Alice. 
• Bob will ask for Alice public key so that he can send bitcoins to Alice. 
• Alice public key will work as an address to Alice. Bob will now encrypt his bitcoin using his private key and will be sent to Alice's public key. 
• Bob's public key will be sent automatically as it will reflect as an address to bob. 
• Alice can see bob Public key so that he can know Bob has sent him bitcoins.