What is the difference between WeChat blocking and deleting?

Wechat is hacked by the other party, and friends can't receive the verification message: when friends add each other, they will prompt "sending failed, and the other party refused your friend verification".

According to what you said, the other party should just delete your friends or blacklist you in the address book. You can try sending a message. If the message is sent successfully, it means that the other party just blacklisted you in the circle of friends. If the message is not sent successfully, you will be prompted to enter the friend verification, which means that the other party will delete you. If the prompt fails to send, it means that the other party has blacklisted you in the address book.