" Moreover, the popular anonymization network "Tor" can do little to guarantee Bitcoin user's anonymity, since it can be blocked easily"....
What does this sentence even mean?
Bitcoin (Litecoin, Maxcoin, *coin (ok, most) ) can use a proxy. This proxy can go through TOR, I2P, 55 VPNs zig-zagging over the globe.
Bitcoin is Anonymous as you don't need to provide your identity. All transactions are however public: visible in the blockchain. It is like imagining a big mess of encrypted emails that everyone hosts on their machines, but you can only read the ones (spend bitcoins from) you have the key for.
Did I mention: you don't need to run a full node, and you can also use an on-line wallet.
1. mine some bitcoins
2. get a VPN
3. Use the VPN to get a free email address (google, riseup or else)
4. Use the VPN to get a VPS hosting
5. set up TOR on VPS hosting (hidden service)
6. and/or set up I2P on VPS hosting (eepsite)
7. Install Bitcoin, Litecoin, *Coin on the machine and run a full node through the VPN, TOR, I2P or combination of them
8. Use the VPN, TOR, I2P (or a combination of them) to access the machine where
9. Use the command line interface to send funds
10. Use any of the libraries to write your own web service to talk to the daemons to manage your funds
There ... find the IP where it came from.... found it ?
1. buy raspberry PI
2. buy throw-away anonymous SIM online (through VPN, I2P, TOR, with bitcoins)
3. install TOR, VPN, I2P, solar panel, gsm modem, Bitcoind, *coind on raspberry PI
4. Take a long ride from home where there is still reception, climb a tree/rock/old building/tower. Install it there ...
Found my IP ?
and so on ...
Or did they mean: if you just run a full node from home and accidentally connect to one of their servers they propagate, they can see where the transaction was coming from the first time ?