Consent Proof
Consent proof is the evidentiary record that a recipient explicitly opted in to SMS — typically a timestamped, IP-logged, hash-locked record of what the user saw and when they consented.
Consent proof is the documentary evidence a sender keeps to demonstrate that each recipient gave express written consent to receive SMS.
Court-grade consent proof includes:
- UTC timestamp of the opt-in.
- IP address and user agent of the consenting device.
- Geolocation at consent time.
- Exact disclosure text the user saw.
- A snapshot or session replay of the form interaction.
- A SHA-256 hash of the record so tampering can be detected.
- A public verification URL where opposing counsel can confirm the record.
Tools like OptInFix produce this entire bundle automatically and offer a downloadable PDF certificate per consent.
Related glossary terms
Express written consent is the TCPA standard for marketing SMS — a clear, conspicuous disclosure with a separate, unchecked affirmative opt-in by the consumer, retained as evidence.
The Telephone Consumer Protection Act is a US federal law (47 U.S.C. § 227) that restricts marketing calls and texts to mobile phones, with statutory damages of $500–$1,500 per violation.
10DLC (10-Digit Long Code) is the US carrier-mandated framework for sending Application-to-Person SMS from local 10-digit numbers, requiring brand and campaign registration with The Campaign Registry.