I hope all the people here advocating a blacklist are trolling. Its probably telling how ineffective a blacklist will be because none of the core developers have bothered to post a serious reply.

Bitcoin works because we trust the math and the network, once we add a blacklist we now have to trust people again.  Angelamerkel, you keep saying we should not push our ideals onto you, however it is really you pushing your ideals onto us. We got involved with Bitcoin based on Satoshi's principles and the core feature is a network based on math and not having to trust people.

Your blacklist is actually against what Satoshi wanted and thus it is anti-bitcoin. I understand you want lots of power to block payments similar to paypal, so I suggest you create a clone of Bitcoin and set it up so that you can satisfy your ideals.

This is DPR's fault for giving over his coins or having a stupid weak password or allowing a keylogger onto his machine. Lets face the facts, DPR screwed up big time, he is so screwed. I wonder what his wallet password to $28 million was? Couldn't have been too difficult.

Also Bitcoins are not actually coins, did you know via taint analysis 98% of all Bitcoin users have a trace of the 10,000 bitcoin pizza transaction? Bitcoins are just numbers and if you blacklist a set amount of coins eventually they will spread all over the network (see via taint analysis how coins dilute into one another)

The blacklist would only work if 51% of the network agreed, and then we have paypalcoin.

Angelamerkel, we are forcing our views because the ideals you are against are the reason most of us got into Bitcoin, you don't want Bitcoin, you want paypalcoin.

Grab the Bitcoin source, add the blacklist system and announce it over in the alt-coin section. Cheers.

And when someone decides to force your assets onto the blacklist in retaliation, or some other perceived slight? Who will be the one providing oversight? And how will we trust them? Will it be a cabal of the 1% of Bitcoin owners? A coalition of government organizations? And what recourse will you have once someone declares your wallet full of fraudulent funds? What happens if the judgment of whatever "authority" deems your appeal invalid and your funds remain forever black-marked?

No need for physical force, if i'm able to corrupt the system based on the rules of the system.

How do people get added to the blacklist? I assume someone has to do so manually? And how is a consensus reached? Votes? Do people have to register their real life identities in order to vote? Or do they just vote by registering?

It's way too easy to game this system. No need for physical violence or threat thereof. You simply threaten to make someones coin horde unspendable. Either by having lots of people register to vote you onto the blacklist (i assume that it would be done via email address or, worst, cell phone number), both are very easy to come by.

Explain precisely how do you stop this?

Then we should blacklist every coin that's ever been stolen via keystroke logger, Trojan, account hack, or anything else nefarious. Except that could do away with far more coins than the FBI got.

Or, you don't like a world with violence and cohersion? What are you options when you buy coins from me (or I otherwise find out your address) and send you an email - give me 10% of your total BTC holdings or else me and my entire syndicate will add your coins to the blacklist? What can you possibly do?  Sure, I dint have a syndicate currently, but if you allow for blacklisting, you'd better believe syndicates will pop up all over.

Think things through. To the logical final conclusion. It's not as cut and dried as you'd like.

People use Bitcoin because cryptography controls there money. The advantage of Bitcoin is that nobody can take away your properly secured money except through coercion. Getting rid of this fundamental part of Bitcoin has devastating effects on what Bitcoin stands for.