If i send bitcoins from my blockchain wallet to my coinbase wallet, is it possible to know that the coins came from a coinbase wallet by the bitcoin address?
Yes of course, I'm sure you've heard this before: "
Bitcoin's transaction aren't anonymous but rather pseudo-anonymous[/i]."
Coinbase is a centralized wallet and exchange and can be easily analyzed using any
blockchain analysis tool since they "
consolidate" most of the inputs using multiple and different (
deposit) addresses, using addresses' inputs together will link them to the same wallet used by any one of those addresses.
Although using that tool (
link above) is as easy as checking a transaction/address in a blockexplorer, a normal internet guy might find it hard but not the authorities with sophisticated tools and agents, they can always find a way.
And in addition, your KYC data is always available for the Gov't and Coinbase to see and every deposit address you've generated will be marked as "
yours".
Next time, post questions like this in the Bitcoin Technical Support board in order to get more accurate answers.