Check Digital Signature Validity With signNow Tools

Award-winning eSignature solution

What digital signature validity means

Check digital signature validity means verifying that a signed document was signed by the claimed person and that the file has not changed since signing. In practice, the system checks the signer’s identity, the signature certificate or cryptographic key, the document hash, and the audit trail. If the hash still matches and the certificate chain is trusted, the signature is considered valid. For U.S. transactions, this helps support integrity, attribution, and evidentiary reliability under ESIGN and UETA.

Why signature checks matter

Checking digital signature validity reduces disputes, speeds document review, and helps preserve enforceability. Under ESIGN and UETA, properly executed electronic signatures can be legally effective, and a reliable validation record strengthens proof of intent, identity, and document integrity.

Why teams look for DocuSign alternatives

Validation pain points

Expired or revoked certificates can make a signed file fail validation even when the signer intended to sign.
Missing timestamps or incomplete logs make it harder to prove when the signature was applied.
Document edits after signing can break the hash and trigger a tamper warning.
Weak signer authentication can leave attribution open to challenge in a dispute.

Legal review

Legal teams validate signed contracts, settlement papers, and consent forms before filing or enforcement.

Operations workflows

Operations teams check lease packets, onboarding files, and approvals that need a clear audit record.

People who rely on validation

Real estate operations managers use signNow to confirm lease packets and closing documents still match the signed record before archiving or sharing them with brokers, lenders, and title teams. They need a clear chain of custody when documents move between offices, mobile devices, and outside parties. The validation step helps preserve transaction integrity across high-volume property workflows.
Healthcare compliance coordinators use signNow to review patient consent forms, release authorizations, and internal policy acknowledgments that may contain PHI. They rely on audit trails, access controls, and retention rules tied to HIPAA, especially when documents are signed on desktop or mobile devices and later retrieved for audits or patient record requests.

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Identity check

Confirms whether the signer’s identity, certificate, and document state still align after signing, which helps teams trust the record before approval or storage.

Tamper detection

Flags post-signing edits by comparing the stored hash with the current file, so tampering is easier to detect.

Audit trail

Preserves a time-stamped history of signing events, which supports review, audit, and dispute response.

Certificate status

Shows certificate status and chain trust details, helping users see whether the signature remains valid or needs further review.

Review speed

Supports faster internal review by reducing manual checks across legal, operations, and compliance teams.

Evidence support

Creates a clearer evidentiary record for ESIGN and UETA workflows when signature validity is questioned.

Connected systems for validation

Connected systems keep signed records, signer data, and validation evidence in the tools teams already use for sales, finance, storage, and operations.

How validation works

Validation follows a short sequence that ties the signer, the document, and the audit record together.

Authenticate: The system confirms the signer’s identity before accepting the signature.
Capture time: It records the signing time and related event details.
Verify integrity: It hashes the document and checks for later changes.
Seal record: It seals the record so tampering becomes detectable.

Quick steps to check validity

Use a short review process to confirm the signature, the file state, and the supporting record.

Open file:
Open the signed document in signNow.
Check details:
Review the signature panel and audit details.
Verify identity:
Confirm the signer name and timestamp.
Match hash:
Compare the document hash with the stored record.
Save record:
Export the audit trail if you need evidence.

Setting	Recommendation
Authentication method	SMS OTP
Signature type	Digital signature
Audit trail	Enabled
Document retention	6 years (HIPAA 45 CFR 164.530(j)(2))
Encryption	TLS 1.2/1.3 and AES-256

Platform and device support

Check digital signature validity in signNow works across major browsers and operating systems, with secure transport and mobile access for review on the go.

Desktop browsers Chrome, Firefox, Edge, and Safari.
Operating systems Windows, macOS, iOS, and Android.
Connection security TLS 1.2 or later required.

For regulated workflows, use managed devices, current browser versions, and controlled access policies. Teams that need API access, SSO provisioning, or certificate-based validation should align device standards with internal security rules and retention requirements before rollout.

Security and compliance

Transport security:

TLS 1.2/1.3 in transit

Storage encryption:

AES-256 at rest

Security certification:

SOC 2 Type II available

Information security:

ISO 27001 certified

Healthcare compliance:

HIPAA support with BAA

Regulated records:

21 CFR Part 11 support

NetSuite operations

A NetSuite operations lead needed signed records to stay aligned across systems and formats.

Kodi-Marie Evans, Director of NetSuite Operations at Xerox
Integration-based routing reduced document handling friction

Xerox used signNow with NetSuite to route the right signatures to the right documents. That kind of workflow helps preserve signed-file integrity while keeping validation evidence available across systems and formats.

Real estate workflow

A property founder needed online execution with strong compliance and mobile access.

Tim Martin, Founder at Martin Properties
Mobile and offline signing supported field work

Martin Properties reported 100% compliance and built-in security in its online document process. For real estate teams, that combination helps keep signed leases and related records organized, reviewable, and easier to validate later.

Best practices for review

A consistent review process helps teams protect evidence, reduce disputes, and keep signed records aligned with policy and retention rules.

Choose stronger authentication

Use stronger signer authentication for documents that may be reviewed in audits, disputes, or regulated workflows. SMS OTP or ID verification gives you better attribution than a simple email link and helps support the audit record.

Preserve the audit trail

Keep the full audit trail with timestamps, signer details, and document history. If a signature is questioned later, the record should show who signed, when they signed, and what changed before and after signing.

Match retention to rules

Set retention rules to match the document type and governing rule. For HIPAA records, keep signed files for 6 years from the later of creation or the last effective date.

Verify before archiving

Review signed PDFs before archiving them. Confirm the hash, certificate status, and any revocation data so you can catch tampering, expired credentials, or incomplete validation before the file leaves active use.

Setup day:

Configure authentication, audit trail, and retention before first send.

First send:

Send one document and confirm the audit record.

Team onboarding:

Train reviewers on signature status and export steps.

HIPAA retention:

Keep signed PHI records 6 years under 45 CFR 164.530(j)(2).

ESIGN consent:

Capture electronic consent before the first electronic transaction.

Part 11 review:

Validate controls for FDA-regulated records before production use.

Trial window:

7-day free trial, no credit card required.

Archive review:

Export signed PDF and audit trail together.

Risks of skipping validation

Enforceability risk

Document may be challenged in court.

Evidence gap

Audit evidence may be incomplete.

Retention failure

HIPAA recordkeeping may fail.

Integrity loss

Tampering may go undetected.

Signer authentication:

The system verifies the signer’s identity before accepting the signature event.

Timestamp capture:

It stores a UTC timestamp for each signing action.

Document hashing:

It generates a document hash to detect later changes.

Tamper seal:

It applies a tamper-evident seal to the signed file.

Event logging:

It records the event history in the audit trail.

Export record:

It lets you export the audit trail for review.

FAQ and troubleshooting

Use these answers to resolve validation questions, confirm compliance needs, and understand which signNow features support the record.

If a signature shows as invalid after signing, check whether the certificate expired or was revoked. signNow audit trails help you review signer details, timestamps, and document history, which supports ESIGN and UETA evidence review.

If a HIPAA file needs retention, keep the signed document for 6 years from the later of creation or the last effective date under 45 CFR 164.530(j)(2). signNow supports audit trails and BAA-backed workflows for PHI.

If you need stronger signer proof, use a plan with advanced authentication. signNow Enterprise adds advanced signer authentication, while all paid plans include audit trails and unlimited users. For healthcare, a BAA is required when PHI is involved.

If a PDF changes after signing, the hash no longer matches and validation can fail. signNow’s tamper-evident record and audit trail help show whether the file was altered after the signature was applied.

If you need records for FDA-regulated workflows, 21 CFR Part 11 requires secure audit trails, unique user IDs, and time-stamped records. signNow can support those controls, but the full system still needs validation by the regulated organization.

If a document must be shared outside the platform, export the audit trail and signed PDF together. That preserves the validation evidence needed for internal review, legal review, or recordkeeping under ESIGN and UETA.

signNow	DocuSign	Adobe Acrobat Sign	PandaDoc
Audit trail	Yes	Yes	Yes
ESIGN and UETA	Yes	Yes	Yes
HIPAA support	Yes	Yes	Yes
Envelope cap	Unlimited	100/year	Not verified

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
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	Business Premium	Yes	Yes	Yes	Yes
Audit trail	Included	Included	Included	Included	Included
Envelope cap	No cap	100/user/year	Not verified	Not verified	Not verified

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