If you post on Pastebin via a proxy chain through as many different countries as you can (Home > Chinese Proxy > Russian Proxy > UK Proxy > USA Proxy > Japanese

If you post on Pastebin via a proxy chain through as many different countries as you can (Home > Chinese Proxy > Russian Proxy > UK Proxy > USA Proxy > Japanese Proxy) I don't see how anyone could ever trace it back to you without total cooperation from every link in the chain.