So, I've seen a number of really horrible ways people have use to "destroy" coins. First off, YOU DO NOT NEED TO SEND YOUR COINS TO ANYONE TO DESTROY THEM. You can destory coins without having to trust anyone

All you need to do is send the coins you wish to destroy to a special provably unspendable address. Specifically, I generated the addresses such that it would require you to generate a public key which when hashed in various ways hashes to 20 bytes of 0.. This is of course statistically impossible unless sha256 or ripemd160 has fatal flaws in it.

Anyway, I've generated a rather large list of addresses. You must generate the address for each different altcoin depending on the "version" of it's address. I include easy instructions on how to properly match up your coin to the proper burn address.

It was a lot of text, so I put it on my blog http://earlz.net/view/2014/10/22/0340/provably-spendable-altcoin-burn-addresses

Also see the PGP signed version here: https://gist.githubusercontent.com/Earlz/de3cc5f6ee85c7a69d53/raw/e9b8f53ddadd1677fc2fd2a0f1df8547e08ae408/gistfile1.txt

For reference to what it looks like on blockchain, you can look at the burned glowcoin transaction: http://cryptobe.com/tx/429d486e39921b0f5dce8b5905afeed4332605aad2d8a5beb244ab2bbb69479a

Also, if you like what I do and all that, donate to me at 1J5t3CW3PZd3YxJZDtuvkijAgHX1MrahiD