From 94b6ebf05770d2d11be0fff4ee830ef954576a73 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Friedger=20M=C3=BCffke?= <mail@friedger.de>
Date: Sun, 21 May 2023 18:09:09 +0200
Subject: [PATCH] Create stacks caip19.md

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+---
+namespace-identifier: stacks-caip19
+title: Stacks Namespace - Asset
+author: Friedger (@friedger)
+discussions-to: 
+status: Draft
+type: Standard
+created: 2023-05-21
+updated: 2023-05-21
+requires: ["CAIP-2", "CAIP-10", "CAIP-19"]
+---
+
+# CAIP-19
+
+*For context, see the [CAIP-19][] specification.*
+
+## Rationale
+
+On Stacks, there are three types of native assets: STX, fungible tokens and non-fungible tokens. STX tokens are exposed to the users,
+the two others are only internal to smart contracts defined by the programming language Clarity. A Stacks smart contract can define 
+more than one native fungible or non-fungible token to allow detailed control over assets.
+
+Smart contracts that contain only one fungible token, resp. one non-fungible token defines a Stacks fungible token (FT), 
+resp. a Stacks non-fungible token (NFT). There are corresponding standards (SIP) exposing token functions to the user.
+
+
+## Syntax
+
+After the [CAIP-2][] (namespace+chainID), a slash defines an `asset_namespace` and an `asset_reference`. 
+The `asset_namespace` is defined via the SIP  or  
+
+| Reference   | Equivalent to | See also            |
+| :---        | :----         | :---                |
+| sip9        | ERC20 Token   |  |
+| sip10       | ERC721        |  |
+| sip13       | ERC1155       |  |
+| nft         |               | SC defining one native non-fungible token but not following sip9 standard |
+| ft         |               | SC defining one native fungible token but not following sip10 standard |
+
+
+## Examples
+
+```
+# Stacks Mainnet NFT：
+stacks:1/sip9:SP3D6PV2ACBPEKYJTCMH7HEN02KP87QSP8KTEH335.megapont-space-agency/4
+
+# Stacks Mainnet xBTC
+stacks:1/sip10:SP3DX3H4FEYZJZ586MFBS25ZW3HZDMEW92260R2PR.Wrapped-Bitcoin
+```
+
+## Links
+
+[CAIP-2]: https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-2.md
+[CAIP-10]: https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-10.md
+[CAIP-19]: https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-19.md
+
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).