Technique for computing a block in a blockchain network

A method for controlling participation of a first miner in a computation of a block for a first message to be added to a blockchain in a blockchain network, the first miner being assigned to a first cluster comprising a set of miners, which includes the first miner, of the blockchain network, the first message being sent from an originating node to a destination node in the blockchain network, the method being performed by the first miner and comprising:

• receiving, from a managing node of the blockchain network, information indicating an assignment of the first miner to the first cluster;
• receiving, from the managing node of the blockchain network, information indicating a plurality of node-to-cluster assignments of a first plurality of nodes of the blockchain network to the first cluster;
• receiving the first message sent from the originating node to the destination node;
• after receiving the first message, based on i) the information indicating the assignment of the first miner to the first cluster and ii) the information indicating the plurality of node-to-cluster assignments of the first plurality of nodes of the blockchain network to the first cluster, checking whether at least one of the originating node and the destination node of the first message is assigned to the first cluster;
• and
• based at least on determining that at least one of the originating node of the first message and the destination node of the first message is assigned to the first cluster, computing the block for the first message, wherein the plurality of node-to-cluster assignments is derived from messages exchanged between a second plurality of nodes of the blockchain network and the second plurality of nodes of the blockchain network comprise the originating node and the destination node.