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Recently shipped v2.4 · 2026.05

Tamper-evident seals

X.509 PKI + RFC 3161 timestamps. Verifiable offline.

Hash-chained audit log

Tampering with one record breaks every record after.

API & webhook hardening

Hashed keys, signed webhooks, scoped tokens.

Encryption
Multi-factor auth
Device management
Document integrity NEW
Audit chain
SSO / SAML NEW
API security NEW
Key management SOON
Infrastructure

Document sealing
Version history
Cloud storage

Highlights

PDF/A-2b archival
RFC 3161 timestamps
Batch sealing
11+ storage providers

SOC 2
Audit logs
Public verification

Frameworks

SOC 2 Type II READY
ISO 27001 ROADMAP
HIPAA · GDPR · eIDAS
21 CFR Part 11

Credentials
Stamp designer
Public directory

Includes

X.509 signing certs
Visual stamp editor
Auto board verification
PE RA PLS PLA

Platforms native

Web iOS Q3 macOS Q3 Android Q4

Plugins host-app

Adobe Chrome

One API. Every client.

Web and plugins call the same audited GraphQL v1 surface. Native clients use gRPC v1 for binary streams over HTTP/2.

GraphQL v1 + gRPC v1 · How we secure it

SOC 2 Type II ready · ISO 27001 scoping

Docs Integrations Changelog Roadmap | All features

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Directory /
Petroleum Engineer /
California

Petroleum Engineers in California

Browse 404 licensed petroleum engineers in California

404

Active Licenses

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All

1 of 404

Zhengming Yang

Oak Park, CA #1749

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Professional document sealing and credential verification for licensed engineers, architects, surveyors, and landscape architects.

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API Overview
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Save your stamp to your free account and it's yours — on every device, forever.

Apply your stamp to PDFs — generous size limit, most submittals qualify.

Every sealed document gets a verification code anyone can check.

A public profile that proves your license is current — no board call needed.

Free. No credit card. No expiration.

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