Securing Blockchain Networks like Ethereum and Hyperledger Fabric

Possible alternatives to data erasure on blockchains

The aforementioned CNIL suggested deleting the private key corresponding to the public key used to encrypt the data to be deleted. In this way, the data to be deleted would remain inaccessible, even without having been physically erased. Other solutions refer to the adoption of blockchains specifically designed to allow the deletion of data through the use of chameleon hashes or pruning procedures, as in the case of the functionality-preserving local erasure (FPLE) approach introduced in Chapter 8, Exploiting Blockchain as an Attack Vector. However, it should be stressed that the difficulty of guaranteeing the right to be forgotten can be made impractical due to the lack of adequate coordination ...