Ethereum, the most-actively used blockchain in the world, is running short on time to convince users to pledge enough digital currency to enable a network upgrade that would allow it to process a similar number of transactions as Mastercard Inc. and Visa Inc. Since Ethereum went live it 2015 it has relied on an energy-intensive and slow method to ensure the computers on its network agree on the current state of its digital ledger. Ethereum developers have been working for years to transition to a system that instead uses a pooled amount of the digital currency Ether to secure the network and allow it to reach ... (full story)