To invade them and get their base would be infinitely cheaper -and none could object once they are defeated, unless they have some secret pact for mutual defense with some gov't (unlikely)-. It already happened at least once in their history.
Alternatively we could set up a "Government of the Bitcoin Republic in Exile in the Cyberspace"
That would not be the first time Sealand has been invaded
In August 1978, while Bates and his wife were in England, Alexander Achenbach, who describes himself as the Prime Minister of Sealand, hired several German and Dutch mercenaries to spearhead an attack of Roughs Tower.[12] They stormed the tower with speedboats and helicopters, and took Bates' son hostage. Bates was able to retake the tower and capture Achenbach and the mercenaries. Achenbach, a German lawyer who held a Sealand passport, was charged with treason against Sealand[12] and was held unless he paid DM 75,000 (more than US$ 35,000 or £23,000).[13] The governments of the Netherlands, Austria and Germany petitioned the British government for his release, but the United Kingdom disavowed his imprisonment, citing the 1968 court decision.[11] Germany then sent a diplomat from its London embassy to Roughs Tower to negotiate for Achenbach's release. Roy Bates relented after several weeks of negotiations and subsequently claimed that the diplomat's visit constituted de facto recognition of Sealand by Germany.[12]
Following his repatriation, Achenbach and Gernot Pütz established a "government in exile", sometimes known as the Sealand Rebel Government, or Sealandic Rebel Government, in Germany,[12] Aschenbach's appointed successor, Johannes Seiger, continues to claim via his website that he is Sealand's legitimate ruling authority.[14]
