AddPrefix adds the `0x` prefix to string values.

HasPrefix tests for the existence of a `0x` prefix.

HexFixLength shifts a hex string to a specific bitLength.

Reverse reverses a hex string.

StripPrefix strips any leading `0x` prefix.

ToBN creates a math/big big number from a hex string.

ToUint8Slice creates a uint8 array from a hex string.

ValidHex tests that the value is a valid string.

ErrInvalidHex is error for invalid hex.

Prefix hex prefix.