Subscription to dependencies in smart contracts

An apparatus, comprising:

• a device including at least one memory adapted to store run-time data for the device, and at least one processor that is adapted to execute processor-executable code that, in response to execution, enables the device to perform actions, including:
• responsive to a smart contract subscription request from a requestor to a first smart contract, adding a registry entry to a first smart contract registry such that the added registry entry includes requestor information associated with the requestor, and subscription information associated with at least one exposed interface of the first smart contract;
• responsive to a change occurring that is associated with at least one exposed interface of the first smart contract, determining, based on the registry, any subscribers to the first smart contract that have a subscription to which the change pertains;
• and
• responsive to determining subscribers to the first smart contract that have a subscription to which the change pertains, causing the determined subscribers to be notified of the change.