Is it enough to just run a node (dl the full 42gig blockchain) or do I have to be a miner?
To be clear, I want to contribute to core not XT.
if you want to contribute in this stats :
https://getaddr.bitnodes.io/you can only just launch a full node of Bitcoin Core with the file named " bitcoin.conf " :
disablewallet=1
server=0
daemon=0
maxconnections=20
---
But, you can mine, too ... like with P2Pool system (no need to login, you can use the anonymity of the bitcoin adress to receive the reward).