# Provenance

Here you can find information about the origin of each REZ. The Fair Selling Principle used by Bored Ape. Each REZ image is first hashed using the SHA-256 algorithm. The combined string is obtained by concatenating the SHA-256 of each REZ image in a specific order as shown below. The final proof is obtained by hashing this combined SHA-256 string. This is the last lineage record stored in the smart contract.

{% hint style="warning" %}
**Attention!** Each REZ token ID is assigned to an art image from the initial sequence using the following formula:
{% endhint %}

**(tokenId + startingIndex) % 10000 → Initial Index**

Contract address: [0xA5f3c575098d280a34A797aa3B3c0074a9C60F86](https://polygonscan.com/token/0xA5f3c575098d280a34A797aa3B3c0074a9C60F86)

Go to provenance page:  <https://rezombies.com/provenance/>


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