Evidence-First E-Signature

Not just signed. Cryptographically proven.

Abundera Sign turns every completed document into a verifiable evidence package: PAdES-LTA signature, trusted timestamps, tamper-evident audit chain, public verification, and court-ready records.

Abundera Sign provides technical and evidentiary records. Admissibility, sufficiency, and litigation strategy depend on jurisdiction, facts, and counsel.

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ESIGN Act & UETA Compliant PAdES Digitally Signed RFC 3161 Timestamped WORM evidence retention Role-based team access Retention controls Security documentation available
◆ Tamper-proof audit chains
◆ Multi-factor signer identity
◆ Court-ready evidence packages
◆ Public document verification
◆ Full REST API
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For legal teams Signature evidence that withstands scrutiny
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For developers Inspect the API and webhook examples
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For founders & ops teams Compare plans and expected monthly cost

How It Works

Three steps to a proven document

1

Create & Send

One API call with template ID, signers, and fields. Or use the dashboard. Signing links go out instantly via email.

2

Sign Anywhere

Signers open a secure link. Optional access code gate. Type, draw, or upload signatures. Plain-English summary helps signers understand the document. Every action recorded.

3

Sealed & Proven

Completed docs get a Certificate of Completion, cryptographic proof page, PAdES digital signature, RFC 3161 timestamp, and tamper-evident seal. PDF emailed to all parties. Webhook fires instantly.

Don't take our word for it

Try it, verify it, inspect it

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Try the full signing flow Send yourself a real document. Sign it, see the certificate, check the audit trail — the full experience in 60 seconds.
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Verify a real document Enter a verification ID or upload a signed PDF. See the hash chain, timestamps, and anchors — no account needed.
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Read the security docs Subprocessors, WORM retention, encryption, compliance standards, and incident response — all documented.
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Browse the API Every endpoint, webhook format, authentication method, and code example. Nothing hidden behind a sales call.

Features

Evidence features most e-sign tools don't even try to provide

31 features across evidence, identity, workflow, and governance. PAdES signatures, RFC 3161 timestamps, hash chains, and more — on every plan.

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Pricing

Stronger records cost much less than the disputes they prevent

Plans from $29/mo. No per-seat fees. Full comparison table, API examples, and FAQ on the pricing page.

View Pricing & Plans

See It Live

Experience the full signing flow in 60 seconds

We'll send you a real NDA to sign. See the signing experience, plain-English document summary, cryptographic proof page, and Certificate of Completion — all with your name on it.

Signing options
Identity Verification
Security Gates
Signing Flow
Language

Signing page UI, emails, and Certificate of Completion language.

All options are presented as optional to the signer during the demo. See all 30+ API options

No account needed. One demo per email per day. Expires in 7 days.

Join the Waitlist

Be the first to know when we launch. Early access members get priority onboarding and exclusive pricing.

Get in Touch

Have questions about pricing, integrations, or legal compliance? We typically respond within one business day.

Launching Soon

US launch in Q2 2026, followed by Canada, UK, Australia, New Zealand, Ireland, and Singapore — then worldwide. Join the waitlist to get early access and exclusive pricing.

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