This Certificate Has an Invalid Digital Signature

Award-winning eSignature solution

What an invalid digital signature certificate means

A certificate with an invalid digital signature is a digital certificate that no longer validates the signer’s cryptographic signature. In practice, the certificate may be expired, revoked, mismatched to the document, or altered after signing. Verification software checks the certificate chain, the signer’s public key, the document hash, and revocation status. If any part fails, the signature cannot prove integrity or identity with confidence, which affects legal review, internal controls, and evidence handling in the U.S.

Why signature validity matters

An invalid digital signature certificate can still document an attempted signing, but it weakens evidentiary value and can delay approval, audit review, or dispute resolution. Under ESIGN and UETA, enforceability depends on attribution, intent, and record integrity, so a failed validation check can create avoidable legal and operational risk.

Why teams look for DocuSign alternatives

Common validation problems

Certificate expiration can break validation even when the signed PDF still looks unchanged.
Revoked or untrusted certificate chains prevent software from confirming signer identity.
Document edits after signing can invalidate the hash and trigger tamper warnings.
Mismatched timestamps or missing revocation data can make long-term verification fail.

Regulated workflows

Healthcare, finance, and real estate teams use it for records that need clear signature evidence and retention.

Document control

Legal, operations, and compliance teams use it for contracts, approvals, and audit-ready document packages.

Real users and workflows

A NetSuite operations director at Xerox uses signNow to route approvals across systems while keeping signature evidence tied to the right record and workflow stage. That matters when a certificate check must support internal controls, audit review, and downstream document matching across finance and operations teams.
A founder in real estate, like Martin Properties’ Tim Martin, uses signNow to execute leases and property forms online with compliance-focused records. When a certificate fails validation, the team can quickly isolate the issue, preserve the signing history, and keep transaction files organized for review.

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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.

Audit evidence

signNow records signer activity, timestamps, and document history so validation issues can be reviewed with context instead of guesswork.

Integrity checks

Tamper-evident records help show whether the document changed after signing, which supports internal review and dispute analysis.

Workflow control

Role-based workflows keep approvals moving while preserving who signed, when they signed, and what they signed.

Mobile access

Mobile signing support helps teams capture signatures in the field without losing record consistency or traceability.

Template consistency

Template reuse reduces setup errors by standardizing the document structure before signature collection begins.

Compliance fit

Compliance-oriented controls support ESIGN, UETA, HIPAA, and 21 CFR Part 11 use cases where record evidence matters.

Connected systems for document control

Connected systems move signed files, signer data, and approval status into the tools teams already use for records, routing, and storage.

How validation works step by step

The validation process follows a short cryptographic and record-check sequence that shows whether the signature still matches the document and certificate.

Verify identity: The certificate is checked against the signer’s public key and trust chain.
Check integrity: The document hash is compared with the signed value.
Confirm status: Revocation and timestamp data are reviewed for validity.
Record outcome: The result is logged for audit review and export.

Quick review steps

Use a short review process to confirm whether the certificate issue is caused by expiration, revocation, or document changes.

Open file:
Upload the signed PDF and open the signature details.
Review certificate:
Check the certificate chain and expiration date.
Confirm hash:
Compare the document hash with the signed version.
Save evidence:
Export the audit trail for internal review.

Setting	Recommendation
Authentication method	SMS OTP and ID verification
Signature type	Advanced electronic signature
Audit trail	UTC timestamps and IP logging
Document retention	6 years for HIPAA records
Encryption	TLS 1.2/1.3 and AES-256

Platform and device support

signNow works in modern browsers on desktop and mobile devices, with secure transport over TLS and support for signing on phones and tablets.

Desktop browsers Chrome, Firefox, Edge, and Safari current versions.
Supported systems Windows 11, macOS, iOS, and Android.
Mobile access signNow mobile apps on iOS and Android.

For regulated workflows, managed Windows and macOS devices are often easier to govern, while iOS and Android apps help field teams sign without returning to a desktop. Browser updates, device policies, and access controls should stay current so validation, audit review, and record retention remain reliable across the signing lifecycle.

Security and compliance controls

Transport security:

TLS 1.2/1.3 protects data in transit.

Data at rest:

AES-256 protects stored records.

Control assurance:

SOC 2 Type II available on request.

Security management:

ISO 27001 certified security program.

Health data:

HIPAA support with BAA.

Regulated records:

21 CFR Part 11 controls available.

Enterprise operations

A NetSuite operations leader needed signature records that stayed tied to the right transaction and approval path.

Xerox used signNow with NetSuite integration.
Signature evidence stayed linked to the record.

The team kept approvals organized and easier to review when certificate validation questions came up.

Real estate

A real estate founder needed online execution with clear compliance records for property documents and leases.

Martin Properties signed documents remotely.
Audit-ready records supported file review.

The workflow preserved signing history and made it easier to isolate validation issues without losing transaction context.

Best practices for validation

A careful setup reduces avoidable validation failures and makes later review easier for legal, compliance, and operations teams.

Match authentication to risk

Use signer authentication that matches the document’s risk level, and require stronger verification for regulated records, financial approvals, or healthcare forms.

Keep evidence together

Preserve the original signed file, the certificate details, and the audit trail together so reviewers can compare identity, integrity, and timing evidence.

Define retention early

Set retention rules before rollout, especially for HIPAA, finance, and HR records, so signed files remain available for the required period.

Check status before filing

Review certificate status before final approval, and train staff to check expiration, revocation, and document-change warnings before filing the record.

FAQ and troubleshooting

These answers focus on certificate validation issues, record evidence, and the signNow features that help teams review the signing history.

In signNow Business, the audit trail and document history help you confirm whether the certificate expired, was revoked, or no longer matches the signed file. If the record needs HIPAA support, use a BAA and keep retention aligned with 45 CFR 164.530(j)(2).

A changed PDF hash usually means the file was edited after signing. signNow’s tamper-evident record and audit trail can show when the change occurred. For regulated records, 21 CFR Part 11 workflows also require secure timestamps and controlled access.

If the signer used weak authentication, attribution can be harder to defend. signNow supports stronger verification options in higher tiers, and regulated workflows often pair that with audit trails and identity controls to support ESIGN, UETA, and HIPAA review.

The Business plan includes legally binding eSignatures, audit trails, templates, and mobile apps. Enterprise adds advanced signer authentication, while Site License adds SSO and full API access. If you need HIPAA handling, confirm the BAA before deployment.

For healthcare records, HIPAA does not require a specific signature technology, but it does require access controls, audit controls, integrity controls, and a BAA with the vendor. signNow supports those controls when configured for PHI workflows.

For FDA-regulated records, 21 CFR Part 11 requires validated systems, secure audit trails, unique user identification, and two-component signatures in many cases. signNow can support those requirements when the workflow is configured for regulated electronic records.

signNow	DocuSign	Adobe Sign	PandaDoc
ESIGN and UETA	Yes	Yes	Yes
Audit evidence	Audit trail	Audit trail	Audit trail
HIPAA support	Yes	Yes	Yes
Starting price	$8/user/mo	$15/user/mo	$14/user/mo
Envelope cap	No cap	100/year	Not verified

Setup:

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

First send:

Use one controlled document to confirm signer flow and evidence capture.

Team onboarding:

Train reviewers on certificate status, hash checks, and export steps.

HIPAA retention:

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

Business plan:

signNow Business starts at $8/user/mo, billed annually.

Free trial:

signNow includes a 7-day free trial with no credit card.

Enterprise rollout:

Enterprise adds advanced signer authentication and advanced integrations.

Site License:

Usage-based pricing supports 1000+ docs/year with unlimited users.

Risks of poor validation

Weak identity

Courts may question attribution.

Missing trail

Audit evidence may be incomplete.

Altered record

Document integrity may fail.

Policy gap

Retention obligations may be missed.

Signer authentication:

Confirm the signer’s identity method and session details.

Timestamp capture:

Capture the signing time in UTC format.

Document hashing:

Generate and compare the document hash.

Tamper sealing:

Apply tamper-evident sealing to the final file.

Audit storage:

Store the event log with the signed PDF.

Export evidence:

Export the audit trail for review or litigation.

	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	Yes, Business Premium	Not verified	Not verified	Not verified	Not verified
Audit trail	Yes	Yes	Yes	Yes	Yes
HIPAA compliance	BAA required	BAA available	BAA available	Not verified	Not verified

28M+Documents signed

13+Years in business

4.6/5Average G2 rating