Beware of scamcoins! Premine, instamine, hidden launch – those coins were created in “get rich quick” scheme in order to make money only by their creators and small group involved in instamine or premine.

Do not use these coins, let them fall into limbo. Using them it’s waste of your time and CPU/GPU power.

List of scamcoins – do not use:

PXC Phenixcoin: premined 1,000,000 coins

BTB Bitbar – premined by small group of coin creators

MNC Mincoin – started with no binaries and 25000% reward blocks

GLD Goldcoin – 2000% superblocks at start (3.2% instamine)

AMC Americancoin- premined with 6.5k-14k blocks giving zero reward

LKY LuckyCoin – superblocks at start, random superblocks

MEM MEMEcoin – premined, superblocks

ARG Argentum – premined

StableCoin – 1,200,000 premined

NUG Nuggets – premined

CDC Cloudcoin- 1,000,000 premined, random blocks

CENT Pennies – hidden launch

SYC Skycoin – premined

CL Copperlark – massively premined

NAN NanoTokens – premined

MST MasterCoin – premined

USC UScoin – premined

GIL – premined

RCH RichCoin – premined

XNC XenCoin – premined

REC RealCoin – premined

RED Recoin – 1,000,000 premined

ALF Alphacoin – premined

One Last Coin – premined

ORB Orbitcoin – 66% premined

NUC Nucoin – premined

Source: xorxor’s list of all cryptocurrencies at bitcointalk forum.