Methods and system for collecting statistics against distributed private data

A method of calculating a statistic with respect to distributed private data, the distributed private data including a plurality of subsets of private data stored on respective memories of a distributed plurality of first computing devices, the method comprising:

• generating, with a processor of a second computing device, a query string;
• transmitting, with a transceiver of the second computing device, a first message to at least one first smart contract that is stored on a first blockchain, the first message including the query string;
• reading, with the processor, a plurality of encrypted votes that are stored on a second blockchain, each of the plurality of encrypted votes having been determined by a respective first computing device of the distributed plurality of first computing devices based on the respective subset of private data stored on the respective memory thereof using a homomorphic encryption scheme;
• determining, with the processor, a final encrypted vote using the homomorphic encryption scheme;
• determining, with the processor, a final vote tally based on the plurality of encrypted votes and the final encrypted vote;
• and
• transmitting, with the transceiver, a second message to at least one second smart contract that is stored on the second blockchain, the second message including the final encrypted vote and the final vote tally.

A method of operating at least one blockchain to enable a second computing device to calculate a statistic with respect to distributed private data, the distributed private data including a plurality of subsets of private data stored on respective memories of a distributed plurality of first computing devices, the method comprising:

• executing, with at least one processor of at least one third computing device in a distributed network of third computing devices, instructions of at least one first smart contract stored on a first blockchain to (i) receive a query string from the second computing device and (ii) store the query string on the first blockchain;
• executing, with the at least one processor, instructions of the at least one first smart contract stored on the first blockchain to generate a genesis block of a second blockchain, the genesis block storing at least one second smart contract;
• executing, with the at least one processor, instructions of the at least one second smart contract stored on the second blockchain to (i) receive a plurality of encrypted votes from first computing devices of the distributed plurality of first computing devices and (ii) store the plurality of encrypted votes on the second blockchain, each of the plurality of encrypted votes having been determined by a respective first computing device of the distributed plurality of first computing devices based on the respective subset of private data stored on the respective memory thereof;
• and
• executing, with the at least one processor, instructions of the at least one second smart contract stored on the second blockchain to receive a final encrypted vote and a final vote tally from the second computing device, the final vote tally being determined by the second computing device based on the plurality of encrypted votes and the final encrypted vote.