An example operation may include one or more of collecting, by a lead peer, state and quality of service (QoS) data from a plurality of peers of a blockchain network, building, by the lead peer, a network graph (NG) based on the state and the QoS data from the plurality of the peers, and mapping, by the lead peer, the NG to a block deliver graph (BDG), wherein edges of the BDG represent a sequence of blocks to be sent from a source peer to a destination peer.