I sent bitcoin to my coinbase address but I didn't know that every transaction, the address changes. My Coinbase account doesn't show my deposit, have I lost the bitcoin? Is it possible to get it back? The address record on the blockchain shows that there is balance but my coinbase wallet doesn't.
If you've sent to the same address before it should work. Addresses in Bitcoin can be reused, it's just not recommended for privacy reasons. I'd suggest reaching out to Coinbase support, and tell them what addresses you've sent money to.