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

> An EVM signature struct signature {
 r: byte_ array;
 s: byte_ array;
 v: integer;
} r: byte_array; The r value of the signature, or the first 32 bytes s: 

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

STRUCT

# signature

An EVM signature

```signature
struct signature {
 r: byte_array;
 s: byte_array;
 v: integer;
}
```

`r: byte_array;`
:   The `r` value of the signature, or the first 32 bytes

`s: byte_array;`
:   The `s` value of the signature, or the next 32 bytes

`v: integer;`
:   The `v` value of the signature, or the last byte, either 26 or 27

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/module.rell#lines-314)

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