P2Pool:

http://94.23.26.37:38485/

Command:

minerd -a quark -o http://94.23.26.37:38485/ -u -p x

{
    "hash" : "0000000028bbe8c116e06ea043801cd0a791406c1f351ccf02a2256c0cc118c2",
    "confirmations" : 40,
    "size" : 400,
    "height" : 2000,
    "version" : 2,
    "merkleroot" : "8005f9b98ecb27bfe2523fa00b39cd5ee691f1078947d71f335f96c191f0b936",
    "tx" : [
        "8005f9b98ecb27bfe2523fa00b39cd5ee691f1078947d71f335f96c191f0b936"
    ],
    "time" : 1391845932,
    "nonce" : 1407259648,
    "bits" : "1c784df3",
    "difficulty" : 544.74276455,
    "previousblockhash" : "0000000040784dfdcbd6759428f03ad6a8d3f38a6d40d7115d21c27bedef64ac",
    "nextblockhash" : "0000000040d992ff06ac1593ddf3af1cad23ac8ca68d5a2981a3d9ec8dd9936c"
}