Tamper Detection for Secure eSignatures
Award-winning eSignature solution
What tamper detection means
Tamper detection is the process of identifying whether a signed document has been changed after signing. In signNow workflows, it works by creating a secure record of the document, the signature event, and the signing history, then checking later changes against that record. If someone edits the file, the signature validation can show the document is no longer intact. For U.S. users, this helps preserve document integrity, support non-repudiation, and provide evidence that the signed version is the version that was approved.
Why tamper detection matters
Tamper detection helps reduce disputes, protect document integrity, and support enforceability by showing whether a signed record changed after execution. Under ESIGN and UETA, it strengthens the evidence trail that courts and auditors review when a signature’s validity is questioned.
Common tamper detection issues
Document edits after signing can break the integrity check and create uncertainty about which version was approved. Weak signer authentication can make it harder to attribute a signature to the right person. Missing audit details can leave gaps in the timeline, device data, or action history. Poor retention practices can make it difficult to produce the signed record during a dispute or review.
Who uses tamper detection
Legal teams
Legal teams use tamper detection for contracts, settlement agreements, and approval records that may be reviewed later.
Regulated records
Healthcare and finance teams use it for consent forms, disclosures, and regulated records that need a clear audit trail.
Typical users and personas
A director of NetSuite operations at Xerox can use tamper detection to protect routed approvals and keep the signed record aligned with system records during high-volume document workflows. A founder at Martin Properties can use tamper detection for lease packets and closing documents, where document integrity, mobile signing, and a clear history matter after execution.
Best ROI. Our customers achieve an average 7x ROI within the first six months.
Scales with your use cases. From SMBs to mid-market, airSlate SignNow delivers results for businesses of all sizes.
Intuitive UI and API. Sign and send documents from your apps in minutes.
Key tamper detection features
Tamper detection adds integrity controls that help teams verify signed records, preserve evidence, and reduce document disputes.
Integrity check
Creates a tamper-evident record that helps show whether the signed file changed after execution.
Audit history
Captures signer activity so the document history can support disputes, audits, and internal review.
Version binding
Links the signature to the document version that was presented at signing time.
Evidence trail
Supports evidence review by preserving the signing sequence, timestamps, and action history.
Final validation
Helps teams verify that the final file matches the approved record before storage or export.
Workflow fit
Works with signed PDFs and routed workflows, so integrity checks fit everyday document processes.
How tamper detection works
Tamper detection follows a simple sequence that records the signing event, seals the document, and checks later changes against the original record.
Capture event: The system records the signer, document, and action details. Hash document: It applies a secure hash to the signed file. Detect changes: Later changes break the validation check. Review history: The audit trail shows the signing sequence and timestamps.
Quick tamper detection steps
Use a simple workflow to prepare, send, review, and store signed documents with integrity checks in place.
Prepare file:
Choose the document and prepare the signing workflow. Send securely:
Send it through signNow with signer authentication enabled. Check record:
Review the completed file and audit trail. Archive safely:
Store the signed version in your system of record.
Recommended tamper detection setup
A clear setup helps preserve integrity, support review, and align signed records with U.S. compliance needs.
| Setting | Recommendation |
|---|---|
| Authentication method | SMS OTP |
| Signature type | SES |
| Audit trail | Detailed event log |
| Document retention | 6 years (HIPAA 45 CFR 164.530(j)(2)) |
| Encryption | TLS 1.2/1.3 and AES-256 |
Platform requirements for tamper detection
Tamper detection works in modern browsers and mobile environments that support secure signing, document viewing, and encrypted connections.
Desktop browsers Chrome, Firefox, Edge Apple devices Safari on macOS and iOS Mobile access Android app and mobile web
For regulated deployments, managed Windows and macOS devices, current Chrome, Firefox, Safari, or Edge browsers, and signed-in mobile apps help keep workflows consistent. Teams that use API access, SSO, or retention controls should also confirm admin permissions, storage policies, and certificate handling before rollout.
Security and compliance snapshot
Transport security:
Storage encryption:
Control assurance:
Security management:
Healthcare compliance:
Legal framework:
Real-world tamper detection examples
Customer examples show how integrity checks fit routing, storage, and review in everyday signing workflows.
Operations workflow
A Xerox operations leader needed routing that preserved the right signature on the right document.
- NetSuite integration kept records aligned.
- Audit history supported internal review.
The workflow stayed traceable across systems, which helped preserve document integrity and reduced confusion during approval and storage.
Real estate
A Martin Properties founder needed online execution for property documents with clear evidence after signing.
- Mobile signing supported field use.
- Built-in security preserved the signed file.
The signed records remained easier to verify later, which mattered for lease packets, approvals, and post-signing review in a real estate workflow.
Best practices for tamper detection
Good integrity controls depend on identity checks, record retention, and careful handling of the final signed file.
Verify signer identity
Store the full record
Prevent silent edits
Set retention rules
Tamper detection FAQ
These answers focus on validation, plan features, and compliance points that affect signed records in U.S. workflows.
signNow Business includes audit trails and legally binding eSignatures, which help preserve the signing record. If a file changes after signing, the validation result can show the document is no longer intact. For HIPAA workflows, use a BAA and keep the signed record under the 6-year retention rule in 45 CFR 164.530(j)(2).
The Business plan includes audit trails, templates, and mobile apps, while Enterprise adds advanced signer authentication. If your workflow needs stronger identity proof, use the higher-assurance authentication options available in the plan that fits your process and compliance needs.
signNow supports ESIGN and UETA compliance, but legal enforceability still depends on consent, attribution, and record retention. If a signer disputes a record, the audit trail, timestamps, and document history become the main evidence for review.
HIPAA workflows require a BAA, unique user identification, integrity controls, and audit controls under 45 CFR 164.312. If PHI is involved, confirm that your account, retention rules, and access controls match the covered entity’s policy before sending.
The Site License adds SSO, full API access, and HIPAA or 21 CFR Part 11 add-ons. If your organization needs centralized identity management or regulated recordkeeping, that plan is the best fit for controlled deployment.
signNow’s audit trail records signer activity, timestamps, and document history. If you need a stronger evidentiary package, export the completed file with its audit trail and keep the original signed version unchanged in your system of record.
Vendor comparison for tamper detection
A short comparison helps show how major vendors handle audit trails, compliance, and transaction limits.
| signNow | DocuSign | Adobe Sign | PandaDoc |
|---|---|---|---|
| Audit trails | Yes | Yes | Yes |
| ESIGN and UETA | Yes | Yes | Yes |
| HIPAA support | Yes | Yes | Yes |
| Envelope cap | No cap | 100/year | Not verified |
Rollout and retention timeline
This timeline combines rollout milestones with retention and policy facts that affect signed records.
Day 1:
Day 2:
Day 7:
HIPAA retention:
ESIGN consent:
UETA coverage:
Enterprise rollout:
Archive review:
Risks of weak tamper detection
Attribution risk
Evidence gap
HIPAA exposure
Enforceability risk
Inside the audit trail
The audit trail records the technical events that support tamper detection and later review.
Signer authentication:
Timestamp capture:
Document hashing:
Tamper-evident sealing:
Event logging:
Audit export:
Pricing and feature snapshot
Pricing and feature notes reflect verified plan data and public entry-tier information where available.
| Plan / Feature | signNow | DocuSign | Adobe Sign | PandaDoc | |
|---|---|---|---|---|---|
| Starting price | $8/user/mo | $15/user/mo | $14/user/mo | $19/user/mo | $15/user/mo |
| Free trial | 7 days | Not verified | Not verified | Not verified | Not verified |
| Bulk send | Yes, Business Premium | Yes | Not verified | Yes | Not verified |
| Audit trail | Yes | Yes | Yes | Yes | Yes |
| HIPAA compliance | BAA required | BAA available | BAA available | Not verified | Not verified |
Key performance indicators that demonstrate SignNow's proven track record.