Understand the regulations surrounding digital endorsements
Yes. Checks are classified as negotiable instruments under UCC.
All negotiable instruments fall under section 3 of UCC Both Federal Electronic Signatures in Global and National Commerce Act (15 USC 7001) and the state Uniform Electronic Transactions Act (UETA) apply to Negotiable Instruments and hence online endorsements of Checks is covered under existing statutes.
More information about Check21 is available here.