Abstract: A technique for controlling participation of a miner in a computation of a block for a message to be added to a blockchain in a blockchain network is disclosed. The miner is configured to perform block computation for messages of one or more security levels available in the blockchain network. A method implementation of the technique is performed by the miner and comprises receiving (S308) the message, checking (S310) whether a security level indication associated with the message matches one of the one or more security levels configured for the miner to determine whether the miner is to participate in the computation of the block for the message, and starting (S312) to compute the block for the message if it is determined that the miner is to participate in the computation of the block for the message.

Abstract: A technique for controlling participation of a miner in a computation of a block for a message to be added to a blockchain in a blockchain network is disclosed, wherein the miner is assigned to a cluster comprising a set of miners of the blockchain network, and wherein the message is sent from an originating node to a destination node in the blockchain network. A method implementation of the technique is performed by the miner and comprises receiving (S306) the message, checking (S308) whether at least one of the originating node and the destination node of the message is assigned to the cluster to determine whether the miner is to participate in the computation of the block for the message, and starting (S310) to compute the block for the message if it is determined that the miner is to participate in the computation of the block for the message.

Abstract: A technique for controlling participation of a miner in a computation of a block for a message to be added to a blockchain in a blockchain network is disclosed. The miner is configured to perform block computation for messages of one or more security levels available in the blockchain network. A method implementation of the technique is performed by the miner and comprises receiving (S308) the message, checking (S310) whether a security level indication associated with the message matches one of the one or more security levels configured for the miner to determine whether the miner is to participate in the computation of the block for the message, and starting (S312) to compute the block for the message if it is determined that the miner is to participate in the computation of the block for the message.