Wash. Rev. Code § 9.38.060
(5)
(a) "Digital signature" means an electronic signature that is a transformation of a message using an asymmetric cryptosystem such that a person who has the initial message and the signer's public key can accurately determine whether the:
[ 2020 c 57 s 24; 2019 c 132 s 1; 2001 c 39 s 1.]