The regional government, led by Carles Puigdemont, paid companies like Amazon and Google in the cryptocurrency to finance the creation of websites and other services that related to the promotion referendum that had been declared illegal by the Spanish administration in Madrid, the Guardia Civil has claimed.
Google was allegedly paid for providing the online tool Project Privacy Shield, that protects websites from cyber attacks while Amazon is said to have been paid for providing the system for counting the votes.
Both firms have received a subpoena, according to a report in the Spanish newspaper El Mundo.
Investigators working for the Guardia Civil claim to have come across the evidence whilst working for the 13th Court of Barcelona, which has sent a citation to both companies to explain the nature of their relationship with the regional parliament.
The judge in charge is looking at how Mr Puigdemont’s administration may have funded the referendum at the start of last month despite measures taken by Madrid to freeze funds.
The Spanish newspaper report claimed one of the heads of the Telecommunications Centre of the Government (CTTI), Josue Sallent, contacted the company Scytl (Secure Electronic Voting) and held several meetings since last April.
It is alleged Mr Sallent proposed “the possible development of a counting software for votes to use in elections to the Parliament of Catalonia and citizen consultations,” according to an unnamed employee quoted by El Mundo.
Everything was expected to be ready by the end of August.
Scytl is said to have quoted the cost of such a project as being between €1-2 million.
But after consulting the law firm Garrigues they reportedly declined to provide the service, saying that while the infrastructure required was not at the time illegal, it could be illegal if it was used in the referendum that had been banned by the Constitutional Court.
Catalan Government officials tried to find a solution but, according to El Mundo, the companies they contacted had higher prices and time was running out and eventually, a Scytl application was used in the referendum that is also used public and police agencies for their internal elections.
Scytl’s technology has been used in the past by Barcelona City Council to consult neighbours on how to reform Diagonal – one of the main roads in the Catalan capital – by the Parliament to vote remotely and Mr Puigdemont used it for citizen consultations as mayor of Girona.
Unnamed sources told the paper, members of the Catalan Government and officials involved paid with bitcoins for some of the services and others with credit cards.
While credit card transactions can be traced bitcoin transactions are anonymous and can be easily concealed.
Express.co.uk has contacted the Catalan Government and Amazon for comment.
Google declined to make an official statement.