Abstract: An example operation may include one or more of receiving, by each of one or more peripheral peers of a blockchain network, a new block from an orderer peer, calculating a hash of the new block, determining the calculated hash is different than hashes from a majority of peripheral peers, determining that one or more blocks that correspond to the different hashes from the majority of peripheral peers are different from the new block, and in response ceasing committing blocks to the blockchain network.

Abstract: An example operation may include one or more of receiving, by each of one or more peripheral peers of a blockchain network, a sequence of new blocks from an orderer peer, calculating hashes for the sequence of new blocks, adding the hashes to a merkle tree, determining the merkle tree is different than merkle trees from a majority of peripheral peers, determining that one or more blocks that correspond to the different merkle trees from the majority of peripheral peers are different from the sequence of new blocks, and in response ceasing committing blocks to the blockchain network.

Abstract: A Byzantine fault-tolerant distributed computing system of nodes configured to process client requests, executes a leader-based total order broadcast (LBTOB) protocol. The computing system concurrently executes multiple instances of the LBTOB protocol at the nodes, on respective disjoint partitions of the client requests, and the disjoint partitions are assigned to the instances using a deterministic function of a state of the system. The computing system multiplexes outputs of the executing instances in an ordered log of the client requests, and the ordered log is maintained at each of the nodes.

Abstract: A computer manages reconfigurations of a Byzantine fault-tolerant, distributed computing system comprising a network of first nodes adhering to a given consensus protocol at a reconfiguration service. The computer services the network by receiving a request of change of status of a second node with respect to the network. The computer informs at least a subset of the first nodes of the received request. The computer obtains an approval of the request, whereby at least a subset of the first nodes collectively approve the change of status as a result of contributions processed according to the given consensus protocol. The computer updates a configuration log according to request approvals obtained by servicing the network. The computer addresses requests of clients about configurations of the network based on the updated configuration log.

Abstract: A computer executes a causal total order broadcast (CTOB) protocol, in a Byzantine fault-tolerant, distributed computerized system comprising a set of nodes acting as servers for clients of the system. The nodes host a trusted proxy client (TPC) process that executes in a trusted execution environment of the nodes. The TPC process includes for each client request (which include encrypted contents) received from any of the clients, signing the client request. The TPC process invokes a total order broadcast (TOB) protocol to obtain a sequence number for the signed request, whereby the nodes establish a total order in which the signed request is processed by the nodes. Upon determining that the signed request is assigned this sequence number, the TPC process reveals a decrypted version of the encrypted contents of the client request to the set of nodes, and the decrypted version is processed according to the TOB protocol.