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One of the scalability issues of blockchains is the increase of their sizeswhich can prevent users from storing them and thus from contributing to thedecentralization effort. Recent works developed the concept of codedblockchains, which allow users to store only some coded fragments of theblockchains. However, this solution is not protected against malicious nodesthat can propagate erroneous coded fragments.  We propose in the paper to add homomorphic hashes to this system. This allowsfor instantaneous detection of erroneous fragments and thus avoids decodingwith wrong data. We describe the integration of this mechanism in codedblockchains and we evaluate its complexity theoretically and by simulation.

Using Homomorphic hashes in coded blockchains