Yes, this is indeed one possible attack vector! For more information, please see: https://en.bitcoin.it/wiki/Weaknesses#Illegal_content_in_the_block_chain htt

Yes, this is indeed one possible attack vector! For more information, please see: https://en.bitcoin.it/wiki/Weaknesses#Illegal_content_in_the_block_chain https://en.bitcoin.it/wiki/Weaknesses#Illegal_content_in_the... To quote: It is illegal in some countries to possess/distribute certain kinds of data. Since arbitrary data can be included in Bitcoin transactions, and full Bitcoin nodes must normally have a copy of all unspent transactions, this could cause legal problems. However, Local node policy generally doesn't permit arbitrary data (transactions attempting to embed data re non-standard), but steganographic embedding can still be used though this generally limits storage to small amounts. Various ideas have been proposed to further limit datastorage in the UTXO set but are not currently being seriously considered for deployment.