Implementing logic gate functionality using a blockchain

A blockchain-implemented control system comprising:

• one or more processors;
• and
• memory storing instructions executable to cause the system to be operable to at least:
• receive a plurality of input signals;
• determine at least one Boolean input based at least in part on the received plurality of input signals;
• and
• execute a locking script and an unlocking script of respective blockchain transactions to provide a first output when one, and only one, input signal enables the generation of a hash value which is equal to a stored data item, wherein executing the unlocking script results in a first input and a second input;
• and executing the locking script includes:
• evaluating the first input to a first value and evaluating the second input separately to a second value, the first value and the second value each being TRUE or FALSE, wherein each of the first input and the second input are evaluated against a respective locking script defining a condition to be satisfied;
• and
• determining, based on the first value and the second value, an output by emulating the functionality of a logic gate using the first value and the second value as inputs to the logic gate, the output corresponding to a TRUE result or a FALSE result wherein the system is configured to monitor or search the blockchain or blockchain network to determine the presence or absence of a transaction which comprises the unlocking script.