I know that you can sell your bitcoin to trade plattform like coinbase etc.. BUT you need to verify your identify, so it' s not anonymously.
How do you cashout your bitcoins anonymously then?
Bitcoin was not built to allow users to remain anonymous. If your a US citizen I would recommend you do not try to obfuscate your Bitcoin transactions. "The IRS treats digital currencies as capital assets and are therefore subject to capital gains taxes".
source:
https://en.bitcoin.it/wiki/Tax_compliance#U.S.