I'm happy for my soul to be immortalized in the blockchain, after I clear up a few things. Is this like a one time deal whereby my soul is forever the property of Mephistopheles, or is it simply a contract that allows Mephistopheles to bargain for my soul? If I give up my soul, can I purchase/trade other souls on the blockchain? Also, does my soul have to be currently damned to be eligible, or can the damning be done later?
This places your soul into the blockchain (provably, as part of the key used to fund the colored coin) to be traded on the open market. Then you will be invited to buy a colored coin for only the small transaction fee. You may choose to hold it or sell it for whatever price you want. You may buy other damned coins from others for whatever price they set. This is a special offer for disciples only. The general damnedcoin offering has other requirements as spelt out on damnedcoin.com.
The damnedcoins themselves are merely a contract with Mephistopheles for your soul to become the property of the coinholder. Mephistopheles doesn't get your soul until you have enriched yourself with the benefits of this Faustian deal. Of course as with the story of Faust by Goethe, there are always loopholes.