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Re:GNU Taler – Electronic payments for a liberal society by onnoonno on Thursday September 24, 2015 @10:55AM (#10271949)
Where is the center of the ledger?
Re:GNU Taler – Electronic payments for a liberal society by rtkwe on Friday September 25, 2015 @08:26AM (#10277714)
I think they're referring to the scalability problem where the number of transactions and size of the blockchain grow to a point where running a full node is prohibitively expensive and leads to a smaller number of miners verifying transactions.

http://radar.oreilly.com/2015/01/blockchain-scalability.html