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Create stacks caip19.md #68

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Create stacks caip19.md
friedger May 21, 2023
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Merge branch 'main' into patch-1
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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
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sentence fragment? perhaps a commit get left off the PR?


| 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
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I'm sorry but I don't see any explanation of the .megapont-space-agency segment in ## Syntax section, nor would it be allowed by Stacks/caip10 or by caip19 itself... is it really necessary or should that information/disambiguation mechanism live elsewhere, for example, in a query or matrix parameter at the end of the URI?


# Stacks Mainnet xBTC
stacks:1/sip10:SP3DX3H4FEYZJZ586MFBS25ZW3HZDMEW92260R2PR.Wrapped-Bitcoin
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The stacks/caip10 syntax is case-insensitive (or all-caps, to be more precise) which I assume is carried over from the Stacks native addressing system. Would it make sense or simplify things for this naming convention to match, to reduce the phishing/impersonation vector of i/I/l/L ambiguities, etc etc?

```

## 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/).