implementations of the EVM must adhere to the specification described in the Ethereum Yellowpaper.
two types of transactions
The EVM’s physical instantiation can’t be described in the same way that one might point to a cloud or an ocean wave, but it does exist as one single entity maintained by thousands of connected computers running an Ethereum client.
At any given block in the chain, Ethereum has one and only one 'canonical' state,
Instead of a distributed ledger, Ethereum is a distributed state machine(opens in a new tab)
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