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We consider the problem of varying the security of blockchain transactionsaccording to their importance. This adaptive security is achieved by usingvariable size consensus committees. To improve performance, such committeesfunction concurrently. We present two algorithms that allow adaptive securityby forming concurrent variable size consensus committees on demand. One isbased on a single joint blockchain, the other is based on separate shardedblockchains. For in-committee consensus, our algorithms may use variousavailable byzantine-robust fault tolerant algorithms (BFT). We implementsynchronous BFT, asynchronous BFT and proof-of-work consensus. We thoroughlyevaluate the performance of our adaptive security algorithms.

Blockguard: Adaptive Blockchain Security