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2. Nick Szabo. Smart contracts: Building blocks for digital markets. 1996.
3. Fabian Vogelsteller and Vitalik Buterin. ERC-20 token standard, 2015. https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md.
4. Security Properties of Light Clients on the Ethereum Blockchain
5. SoK: Layer-Two Blockchain Protocols