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

> The origin of a crosschain asset that can be used on this chain. An asset can be issued on this chain, or a different one. If it is issued on a different
c

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

ENTITY

# asset\_origin

The origin of a crosschain asset that can be used on this chain.

An asset can be issued on this chain, or a different one. If it is issued on a different
chain, it's considered a crosschain asset, and it will have an `asset_origin` linked to it.

An asset has an `asset_origin` if it is a crosschain asset and vice versa.

The origin of the asset might be different from the issuing chain, although in many cases it
will be the same. The origin chain represents a chain that is providing the assets to this
chain, considered its parent. Assets can only be transferred from a parent to a child chain
and vice versa, and only one parent chain can exist for a given asset. Different assets
can have different origins.

When this chain sends assets to chains that are not the parent chain (children), it will
keep track of the balance of each child chain through blockchain account entities; the
children chain cannot send assets among themselves - they must send them through the parent
chain. On the other hand, children chains will not keep track of the parent chain balance.

**See Also**

* [ACCOUNT\_TYPE\_BLOCKCHAIN](https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.crosschain/-a-c-c-o-u-n-t_-t-y-p-e_-b-l-o-c-k-c-h-a-i-n/) — for more info on blockchain account entities
* `core.assets.issuing_chain_brid` — for information on issuing chains

```signature
entity asset_origin {
 key asset: asset;
 origin_blockchain_rid: byte_array;
}
```

`key asset: asset;`
:   The crosschain asset

`origin_blockchain_rid: byte_array;`
:   The origin of that asset

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/crosschain/blockchain.rell#lines-42)

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