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

# Welcome to PIN

![](/files/-M_iEoUmwFpgSHU2sPAw)

PIN📌is a proof-of-work cryptocurrency designed to index web3 metadata. PIN also exists as a wrapped token on [Ethereum](https://etherscan.io/token/0xc1f976b91217e240885536af8b63bc8b5269a9be), Binance Smart Chain, and Polygon.

{% hint style="success" %}
**Looking for FLO? We've re-branded to PIN:** [**FLO Rebrand and Expansion Into Web3**](https://medium.com/public-index-network/upgrading-flo-to-pin-to-build-content-rich-web3-applications-d3b679b8f6ab)
{% endhint %}

Users and developers can **"pin"** metadata, permanently and immutably storing it on the network for public use. Pins can then be retrieved and read by any PIN-based application. When combined with its supporting metadata library, the [Open Index Protocol ("OIP")](https://www.openindexprotocol.com/), **PIN provides a new standard for publishing, indexing, and monetizing any digital content.**

A robust development community is actively using PIN to create and index immutable links that will help to serve as the infrastructure for web3.

[![](/files/-M_hXze0HyMMEP3vE__t)](https://docs.publicindex.network/for-users/exchanges) [![](/files/-MaBcoAD0wSDgb5gDj0U)](https://docs.publicindex.network/for-users/upgrade-flo-to-pin)

> "The goal of PIN is to build a worldwide database of metadata for content on the web,"
>
> — **Joseph Fiscella**, CEO of PIN Labs.

{% content-ref url="/pages/-MZuTSDRvkyYn6AMLxI4" %}
[Design Philosophy](/about-pin/design-philosophy.md)
{% endcontent-ref %}

![](/files/-M_iEaA9UbvyvY9l-M65)

{% embed url="<https://twitter.com/pinblockchain>" %}

![Established 2013](/files/-M_ltF1W37K57nC1Ubgt)