I welcome a reputation challenge considering the amount of scamming (especially in alt-coins lately). I provide past trades as an indicator of my trust-worthiness. That's not to say people can't hack into a trusted member's account and start scamming. I think John K got it right with PGP signing and I'm going to look into doing that myself. Anyway, here are a few transactions I have to refer to:
This thread has several vouches for my XRP trades.
I also sold $1300 in GPUs here: https://bitcointalksearch.org/topic/sold-3x-5970-1x-5870-184952
I sold $900 in BTC-e codes here: https://bitcointalksearch.org/topic/wtt-my-btc-e-coupon-usd-for-your-amazon-gift-card-173675
I sold BTC for Paypal here: https://bitcointalksearch.org/topic/active-trusted-trader-buying-2-btc-mtgox-5-via-paypal-205472