At the High Court at Auckland today, Justice Tim Brewer reserved his decision until tomorrow following a hearing before a packed courtroom that included Dotcom's heavily pregnant wife Mona.
Crown lawyers, on behalf of the US Government, appealed last week's decision to grant the Megaupload founder bail, arguing he was still a flight risk.
The FBI wants to extradite Dotcom and three associates to the US to face charges including conspiring to commit racketeering, conspiring to commit money-laundering, copyright infringement and aiding and abetting copyright infringement.
The 38-year-old is accused of breaching international copyright laws to the value of US$500 million through the company he founded _ file-sharing site Megaupload - in what US prosecutors allege was a "mega conspiracy''.
Dotcom has denied any wrongdoing and has consistently said he will not try to leave New Zealand.
His lawyer, Paul Davison QC, said today his client had taken his bail conditions very seriously and had even erected signs at his Coatesville property asking people not to bring 3G mobile phones into his home.
Dotcom's bail conditions include not using the internet or a helicopter, and he cannot travel more than 80km away from his $4.3m mansion.
Mrs Dotcom is due to give birth to twins next month.
