Lucky Number Tickets

A lucky number ticket operator wants to publish the randomly generated winning tickets for transparency and to avoid possible disputes.

1. The operator draws a lucky number winning ticket (picks a random number).

2. They write the ticket to the blockchain using nChain Event as unencoded records ‡, obtaining the record location which they publish.

3. Anyone with the location can read the winning ticket number and see when the draw was taken.

4. Any holder of a ticket can verify † whether theirs is the winning ticket.

Benefits

• The returned result is proof of what data an organisation submitted to the blockchain and when.

• Verifiable: The original data and time can be verified.

• Transparent: The Records are publicly accessible, and the result is readable from the blockchain.

• Irrefutable: A record of the data exists on the blockchain (tamperproof & cannot be repudiated).

• Trust and Fairness are established by using the blockchain, a decentralised independent arbiter.

A Lucky Number demo application for nChain Event is available from the Product Suite Platform. See here.

Extended Lucky Number Scenario

The lucky number creator can create tickets by writing records to the blockchain, and using the resultant record location as the ticket number (since it is effectively a large random number).

Anyone can view their ticket on the blockchain and the set of potential winners can be fully transparent up to the time of the draw.

To make the draw, a ticket can be picked at random by using the low-order bits of the location of a written transaction as the random ticket selector.

The tickets, the winning ticket selection, the picker’s identifier and the winning ticket number can be written to the blockchain using nChain Event.

See here about persistent GUIDs and here for more details of this extended screnario.

Internet of Things (IoT) Data