We don't block any ports or protocols at present. I haven't played with any of the crypto-currencies yet (seems too much like a pyramid scheme) myself ...
You guys are definitely blocking
SOMETHING because I can't sync my bitcoin wallet either.
I've been on many, many different ISPs and none of them have this problem other than telkom.
I understand not everyone is tech savvy and with the times, and you may still think it is some kind of "scheme" or whatever but you guys have to unblock the bitcoin protocol.
Some of us are using bitcoin as a payment gateway, legitimately paying for many, many things.
I alone use it for Steam games, Web Hosting, NNTP Servers, indexers, Takealot shopping, or just cashing out to FNB/etc..
Get with the times and unblock it man, we are paying for this little service called "The internet"
FYI, Bitcoin is a lot more transparent than fiat currency, gets created at a predictable rate, has no fee's or hidden charges, payments can't be stopped by "bad actors", accounts cannot be frozen, personal info is never sent when paying, transfers are instant, and inter-continental transfers are open, free, and fair.
If you think that sounds like a pyramid scheme, you don't have to use it - but open the ports for the rest of us at least FFS.