An example operation may include one or more of connecting, by a notifier node, to a notifier service node configured to designate the notifier node, receiving, by the notifier node, a notification from the notifier service node to read a block from a ledger of a blockchain, applying, by the notifier node, a function on the block to determine if the notifier node is a designated notifier for at least one submitted transaction in the block, and, in response to a determination that the notifier is the designated notifier, sending, by the notifier node, a push notification to user nodes involved in a transaction associated with the block.