> For the complete documentation index, see [llms.txt](https://flippin.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://flippin.gitbook.io/docs/guide/dyor-guide.md).

# DYOR Guide

### How to check project fairness

#### Raffle

<https://codepen.io/FlipnLabs/pen/bGKPmza?editors=0010>

```
// Raffle Provably Fair Algo

const ticketsAmount = 1000; // 1000 tickets
const public_seed =
    "5faeebc06078ed03979a9efc914f4af458919f118848d6403445f8ba4caf6b1f";

// secret
const eos_block_id =
    "082332b803efcd4df8578f2f23e7141353074b31a6c7af77ea05293e91bc9faf"; 

// https://cryptojs.gitbook.io/docs/#hmac
const hmac = CryptoJS.HmacSHA256(eos_block_id, public_seed); 

const outcomeHash = hmac.toString(CryptoJS.enc.Hex);
// => ee8bc8151d4348590fc5cdbb4c1b0be02fa2d4c92bcf0d3e4aec4ac82b1a138f

const slice = outcomeHash.substr(0, 8);
// => ee8bc815

const random = parseInt(slice, 16) / 0xffffffff;
// => 0.9318203977150424

const result = Math.floor(random * ticketsAmount) + 1;

const outcome = Math.min(maxTickets, result);

```

#### Coinflip

<https://codepen.io/FlipnLabs/pen/QWxXZZm?editors=0010>

#### Duel

<https://codepen.io/FlipnLabs/pen/YzvoJjw?editors=0010>

### How to check buybacks and burn

On flippin.money - Go to Fairness Tab - FLIP Buybacks.

<figure><img src="/files/NBel78HTQoRWpFcTRGNs" alt=""><figcaption><p>FLIP Buybacks/Treasury</p></figcaption></figure>

Before coin launch - Treasury Address: 0x4A0eE640239741EAd1f051C4acf784722C9989Ed

After coin launch - Buyback contract: TBA&#x20;


---

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