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Verkle Tree is a common Accumulator, which can be used to prove that one element exists in the Accumulators.
Compared to Merkle tree, VerKle Tree has been improved a lot in the Proof size as a critical part of the ETH2.0 upgrade. The 23rd tech review by Sin7Y will demonstrate the principle of the principle.
When it comes to data with the size of one billion, the Merkle Tree proof will take 1kB, while the Verkle tree proof only needs no more than 150 bytes.