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

> function is_ blockchain_ allowed(rule: rule , blockchain_ rid: byte_ array): boolean Utility function which returns whether a rule allows a certain blockch

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts.strategies.transfer/is_blockchain_allowed/

FUNCTION

# is\_blockchain\_allowed

```signature
function is_blockchain_allowed(rule: rule, blockchain_rid: byte_array): boolean
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/accounts/strategies/transfer/config.rell#lines-22)

Utility function which returns whether a rule allows a certain `blockchain_rid` as sender.

**Parameters**

* **rule** — the rule to check
* **blockchain\_rid** — the blockchain sender to check

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