<p>It appears to me that &quot;collections&quot; isn't something defined by the Ordinals protocol, and it's not something that gets stored on chain. Rather, there appear to be centralized repositories to which people can submit their collections to be indexed as such.</p>
<p>The Ordinals Wallet has a GitHub repository that accepts collection submissions via pull requests. OpenOrdex uses the same repository. Ordswap appears to be accepting them using a Discord bot. These use two very different submission formats. There might be other repositories, but these were the easiest to find. I am not sure if there is any exchange of data between the marketplaces, but I would guess that creators are expected to submit their collections to every marketplace where they want to be listed.</p>

CC BY-SA 4.0
2023-03-08T08:50:31.947Z
I see. That solves my confusions. Thanks Vojtěch!
Jeffrey Hu
CC BY-SA 4.0
2024-05-26T03:40:38.370Z
As for now, [this](https://github.com/ordinals-wallet/ordinals-collections) GitHub repo is not maintained anymore. I'm wondering where to find the metadata of each "collection"...
Yan
CC BY-SA 4.0
2023-03-08T06:42:14.213Z
2023-03-08T06:52:26.747Z
2023-03-08T06:52:26.747Z
Vojtěch Strnad
<p>Right now, there are <strong>collections</strong> in Ordinals marketplaces.
For example:</p>
<ul>
<li><a href="https://openordex.org/collections" rel="noreferrer">https://openordex.org/collections</a></li>
<li><a href="https://ordinalswallet.com/collections" rel="noreferrer">https://ordinalswallet.com/collections</a></li>
<li><a href="https://ordswap.io/collections/" rel="noreferrer">https://ordswap.io/collections/</a></li>
</ul>
<p>But I failed to find the <code>collection</code> related params in the <a href="https://docs.ordinals.com/?search=collection" rel="noreferrer">Ordinals' docs</a></p>
<p>So my questions are:</p>
<ol>
<li>Where are &quot;collections&quot; stored? Are they also stored on chain? or they are just indexed off chain?</li>
<li>If on chain, how to write &quot;metadata&quot;-like info to specify the collections? What is the format?</li>
<li>If off chain, are they indexed by creators or marketplaces, or both? How these indexes are passed/aligned across marketplaces?</li>
</ol>

<ordinals>
What is "collection" for Ordinals? Where are "collections" stored?
Jeffrey Hu
# What is "collection" for Ordinals? Where are "collections" stored?

(Asked by: username_0 on 2023-03-08)

Right now, there are **collections** in Ordinals marketplaces.
For example:

* <https://openordex.org/collections>
* <https://ordinalswallet.com/collections>
* <https://ordswap.io/collections/>

But I failed to find the `collection` related params in the [Ordinals' docs](https://docs.ordinals.com/?search=collection)

So my questions are:

1. Where are "collections" stored? Are they also stored on chain? or they are just indexed off chain?
2. If on chain, how to write "metadata"-like info to specify the collections? What is the format?
3. If off chain, are they indexed by creators or marketplaces, or both? How these indexes are passed/aligned across marketplaces?

**Tags:** ordinals


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## 1 answers

### Answer by username_1 on 2023-03-08. Score: 2 | Accepted answer

It appears to me that "collections" isn't something defined by the Ordinals protocol, and it's not something that gets stored on chain. Rather, there appear to be centralized repositories to which people can submit their collections to be indexed as such.

The Ordinals Wallet has a GitHub repository that accepts collection submissions via pull requests. OpenOrdex uses the same repository. Ordswap appears to be accepting them using a Discord bot. These use two very different submission formats. There might be other repositories, but these were the easiest to find. I am not sure if there is any exchange of data between the marketplaces, but I would guess that creators are expected to submit their collections to every marketplace where they want to be listed.

> **Comments:**
> **username_0**: I see. That solves my confusions. Thanks username_1!  
> **username_2**: As for now, [this](https://github.com/ordinals-wallet/ordinals-collections) GitHub repo is not maintained anymore. I'm wondering where to find the metadata of each "collection"...  

---

