Re: Came to say the same thing
that would be illegal and unusable
Has not stopped such things in the USA. FISA abuse, for starters.
A distributed database with 250 million sets of records is NOTHING. I can see how to build and use such a thing, tie it in with motor vehicle departments and law enforcement, and make it available for anyone that wants the data with the right "warrant" even though we know FISA has already been abused like this.
A daily report of GPS location and time, taken every 5 minutes, means 12 records per hour of driving, consisting of a 64-bit integer (seconds since the epoch), and 3 double precision floating point values (longitude, latitude, elevation). Total 32 bytes times 12 for each hour of driving, indexed to your VIN number, which is associated with YOU.
NOT hard at all. Not a lot of data, either. (I know)
And all law enforcement needs is a place to look or a person to investigate, and if this information NEVER shows up in court, it does not need to be "admissable evidence" as far as anyone is concerned.
Best hope those in power do not suddenly say "Find me the man and I'll find you the crime".