- Yes - through GPS in the bitcoin wallet code can be correct if you are using some unknown wallet that may have a backdoor
not that there is any that i have seen so far!
- Yes - your identity is always revealed this depends on the type of wallet you are using. if you are using a WALLET like bitcoin core, armory, electrum,... then it is not. but if you are using a bitcoin ACCOUNT which they call wallet such as coinbase then it is true.
- Yes - through the nodes this can also be true but not easy. basically you have to create a ton of nodes and connect to a ton of other nodes. then you select someone's node and connect to it and fill all its connection slots. each time that node sends a transaction you check to see whether you have seen this transaction before (if it is relaying it) or it is a new one (creating it). if it is new then he owns the coins.
> Can nodes tell which bitcoin addresses belong to which IP addresses?
No.
No.
i was pointing out the "special cases" of each of these situations where they may become true
for example satoshi is right nodes can't tell these things but there is a way of isolating a node that you want (like government performing these stuff with a lot of funds) and get the information you want out of it.
read the replies to this: https://bitcointalk.org/index.php?topic=1581065.0;all