(1) The sponsor of an electioneering communication shall preserve all financial records relating to the communication, including books of account, bills, receipts, contributor information, and ledgers, for not less than five calendar years following the year in which the communication was broadcast, transmitted, mailed, erected, or otherwise published.

(2) All reports filed under RCW 42.17A.305 shall be certified as correct by the sponsor. If the sponsor is an individual using his or her own funds to pay for the communication, the certification shall be signed by the individual. If the sponsor is a political committee, the certification shall be signed by the committee treasurer. If the sponsor is another entity, the certification shall be signed by the individual responsible for authorizing the expenditure on the entity's behalf.