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Light clients, also known as Simple Payment Verification (SPV) clients, arenodes which only download a small portion of the data in a blockchain, and useindirect means to verify that a given chain is valid. Typically, instead ofvalidating block data, they assume that the chain favoured by the blockchain'sconsensus algorithm only contains valid blocks, and that the majority of blockproducers are honest. By allowing such clients to receive fraud proofsgenerated by fully validating nodes that show that a block violates theprotocol rules, and combining this with probabilistic sampling techniques toverify that all of the data in a block actually is available to be downloaded,we can eliminate the honest-majority assumption, and instead make much weakerassumptions about a minimum number of honest nodes that rebroadcast data. Fraudand data availability proofs are key to enabling on-chain scaling ofblockchains (e.g. via sharding or bigger blocks) while maintaining a strongassurance that on-chain data is available and valid. We present, implement, andevaluate a novel fraud and data availability proof system.

Fraud and Data Availability Proofs: Maximising Light Client Security and Scaling Blockchains with Dishonest Majorities