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

> function _ evm_ message_ hash(message: text): byte_ array Given a message, a valid EVM signature will add some information to it prior to hashing it
and cr

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

FUNCTION

# \_evm\_message\_hash

```signature
function _evm_message_hash(message: text): byte_array
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/authentication.rell#lines-482)

Given a message, a valid EVM signature will add some information to it prior to hashing it
and cryptographically signing.
This function returns the hash of the message as per the EVM signature specifications in
EIP-191.

**Parameters**

* **message** — the message to sign

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