The two laws that make e-signatures binding
Two laws govern electronic signatures in the United States. The Electronic Signatures in Global and National Commerce Act (ESIGN), passed by Congress in 2000, applies to interstate and international commerce. The Uniform Electronic Transactions Act (UETA), passed by 49 states (every state except New York, which has its own equivalent), applies to intrastate transactions.
Together, ESIGN and UETA make this clear: a contract or signature can't be denied legal effect just because it's electronic. An electronic signature has the same legal standing as a wet-ink one — provided four conditions are met.
The four conditions for a binding e-signature
Both laws set out the same four conditions. They're not bureaucratic. They're common-sense protections against fraud.
- Intent to sign: the signer must have intended to sign the document
- Consent to electronic transaction: the signer agreed to do business electronically
- Association: the signature must be logically associated with the document being signed
- Record retention: the signed record must be retained and accessible to all parties
What to capture for a defensible audit trail
If a customer disputes the contract later — claiming they never signed it, or signed a different version — you need an audit trail. Eight pieces of evidence make a signature very hard to dispute.
- Signer's name (typed or drawn)
- Signer's email address
- Signature image (the drawn signature itself, stored as a data URL)
- Consent text shown to the signer at signing time
- Timestamp of signing (server-side, not client-side)
- IP address of the device used to sign
- User-agent (browser/device fingerprint)
- Document hash — a cryptographic fingerprint of the exact document version signed
Are phone signatures binding?
Yes. A signature drawn with a finger on a touchscreen is legally equivalent to a wet-ink signature, provided the four ESIGN conditions are met. The medium doesn't change the legal standing.
What matters is that the signing flow makes intent clear, captures consent explicitly, ties the signature to the document, and stores the signed record. A phone-drawn signature with a proper audit trail has been upheld in court in every state.
When ESIGN doesn't apply
ESIGN excludes a handful of document types. For contractors, the relevant exclusions are: wills and codicils, certain court orders, notices of cancellation of utility services, and a few others. Contractor proposals and contracts are not excluded.
Some states require specific notices on home-improvement contracts above a threshold dollar amount (often $500–$2,500). These notices — like the customer's right to cancel within three days — must appear in the contract regardless of whether it's electronic or paper.
What to do if a customer disputes a signature
Disputes are rare when the signing flow is clean. When they happen, the audit trail does the heavy lifting. Produce the eight pieces of evidence above and the dispute typically ends within an email exchange.
If it escalates to court, the contractor with the cleaner audit trail wins. Wet-ink signatures don't carry IP addresses, timestamps, or document hashes. Done correctly, an electronic signature is more defensible than a paper one.
Quick checklist for ESIGN-compliant proposals
Before sending your next proposal, confirm the system you're using captures all of this.
- Explicit consent language on the signing screen
- Signature image captured and stored
- Timestamp recorded server-side
- IP address recorded
- Document hash computed and verified at signing
- Signed record accessible to both parties indefinitely
- No post-signing edits allowed without re-signing