@spec headers(String.t() | binary(), String.t(), integer(), integer()) :: map()

Builds L1 auth headers using the current Unix timestamp.

To supply your own timestamp, use headers_at/5. This arity intentionally takes only the nonce as its last argument so a caller-supplied timestamp can never be silently bound to the wrong positional and replaced by system time.

@spec headers_at(String.t() | binary(), String.t(), integer(), integer(), integer()) ::
  map()

Builds L1 auth headers for an explicit, caller-supplied timestamp.

Prefer this over headers/4 whenever you need a specific timestamp: every positional argument has a stable meaning here, so the timestamp can never be mistaken for the nonce.

@spec sign(String.t() | binary(), String.t(), integer(), integer(), integer()) ::
  String.t()

Signs a ClobAuth message and returns a 0x-prefixed Ethereum signature.