UTXO stands for An Unspent Transaction Output. It is one of the key concepts in bitcoin design and it is closed related to modern "payment, settlement, clearance" process in financial system.

In the academic world, it is an important research direction to limit the size or even make the storage size constant. One promising technique is RSA accumulator. Stanford University professor introduced novel solution in his paper “Batching Techniques for Accumulators with Applications to IOPs and Stateless Blockchains” coauthored with Benedikt Bünz and Ben Fisch.

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Cardano EUTXO Blockchain Upgrade Will Combine the Best Of Bitcoin and Ethereum
Cardano founder Charles Hoskins recently shared a file on his Twitter feed that outlined how the upcoming Goguen update will implement smart contracts using an extended UTXO purported to offer the best features of both the Ethereum and Bitcoin blockchain record keeping models.

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