> For the complete documentation index, see [llms.txt](https://docs.teranode.group/nchain-event/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.teranode.group/nchain-event/independent-records/use-cases/lucky-number-tickets.md).

# Lucky Number Tickets

<figure><img src="/files/6FkEVdiZJxWO9AzKMEUP" alt="" width="563"><figcaption></figcaption></figure>

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 [**‡**](/nchain-event/overview/configuration-symbols.md), 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 [**†**](/nchain-event/overview/configuration-symbols.md) 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.

{% hint style="info" %}
A Lucky Number demo application for nChain Event is available from the Product Suite Platform. See [here](https://ln.event.nchainplatform.com).
{% endhint %}

***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*](/nchain-event/independent-records/tutorials/blockchain-unique-identifiers.md) *about persistent GUIDs and* [*here*](/nchain-event/linked-records/use-cases/random-prize-draw.md) *for more details of this extended screnario.*

{% content-ref url="/pages/CrPgi24sh3N5oBUFQ0JJ" %}
[Internet of Things (IoT) Data](/nchain-event/independent-records/use-cases/internet-of-things-iot-data.md)
{% endcontent-ref %}