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Re:Secretive Bitcoin Startup 21 Reveals Record Funds, Hints ... by deweller on Tuesday March 10, 2015 @02:32PM (#9179635)
This uses Simplfied Payment Verification (SPV).

SPV helps with some scalability issues, but doesn't solve them all.

From http://bitcoin.stackexchange.com/questions/4649/what-is-an-s...:

> SPV: A Bitcoin implementation that does not verify everything, but instead relies on either connecting to a trusted node, or puts its faith in high difficulty as a proxy for proof of validity. BitCoinJ is an implementation of this mode.

See also:

http://bitcoin.stackexchange.com/questions/11054/understandi...

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