# register_crosschain_asset · FT4 Rell API · Chromia Docs (concept)

> function register_ crosschain_ asset(asset_ id: byte_ array, name: text, symbol: text, decimals: integer, issuing_ blockchain_ rid: byte_ array, icon_ url:

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.crosschain.Unsafe/register_crosschain_asset/

FUNCTION

# register\_crosschain\_asset

```signature
function register_crosschain_asset(asset_id: byte_array, name: text, symbol: text, decimals: integer, issuing_blockchain_rid: byte_array, icon_url: text, type: text, uniqueness_resolver: byte_array, origin_blockchain_rid: byte_array): asset_origin
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/crosschain/blockchain.rell#lines-110)

Registers a crosschain asset on this chain. Since this could be used to register
many assets and use up a lot of storage space, it is marked as `Unsafe`

Can only be called from an operation.

Throws `"INVALID ORIGIN"` when the origin blockchain RID is the blockchain RID of this
chain.

Throws `"INVALID ISSUING CHAIN"` when the issuing blockchain RID is the blockchain RID
of this chain.

Throws if the input parameters are invalid. Common cases include:

* IDs are not 32 bytes long
* strings are longer than 1024 characters
* type is empty
* uniqueness resolver is longer than 1024 bytes
* decimals is not in the accepted range [0, 78] (inclusive)
* `icon_url` is not a valid URL

**Parameters**

* **asset\_id** — the ID of the asset to be registered
* **name** — the name of the asset to be registered
* **symbol** — the symbol of the asset to be registered
* **decimals** — the decimals of the asset to be registered
* **issuing\_blockchain\_rid** — the first chain where the asset was registered
* **icon\_url** — the URL of the icon for the asset, can be an empty string in the case of no icon
* **type** — the type of the asset to be registered. In most cases, this should be the value of `core.asset.ASSET_TYPE_FT4`
* **uniqueness\_resolver** — the uniqueness resolver for the asset. In most cases, this is not needed and it can be set to `x""`
* **origin\_blockchain\_rid** — the blockchain we'll receive this asset from. This is not necessarily the same as `issuing_blockchain_rid`, but it will often be.

**See Also**

* `asset_origin` — for information on the `origin_blockchain_rid` parameter
* `core.assets.asset` — for informations on all other parameters

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.crosschain.Unsafe/register_crosschain_asset.html)Generated API reference, mirrored from the live docs