ATECC508A.Request.sign_digest

You're seeing just the function sign_digest, go back to ATECC508A.Request module for more information.
Link to this function

sign_digest(transport, key_id, digest)

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Specs

sign_digest(ATECC508A.Transport.t(), slot(), binary()) ::
  {:ok, binary()} | {:error, atom()}

Sign a SHA256 digest.