# 67 Scaling Ethereum after the Shanghai Upgrade
The Ledger Podcast
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How to Secure Local Consensus on a Blockchain?
The idea of sharding is to take your blockchain and split it into several smaller chains. It's a basic divide and concierge strategy when you do a computer say yes, this is a very well-known strategy. And then the big question is how do you secure like there's local consensus? So it's not a trivial one. That's why it's important to move to proof of stake in this kind of situation.
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