ProofChain LLC — Terms of Service

Last updated: September 20, 2026 · Effective: September 20, 2026

1. Who we are and what these Terms cover

These Terms of Service ("Terms") are a binding agreement between ProofChain LLC, a Wyoming limited liability company ("ProofChain," "we," "us," "our"), and the individual or entity that accesses or uses our products and services (the "Customer," "you").

These Terms govern the ProofChain products and services you use, including Sentra (defined in Section 3). Other ProofChain products may carry their own additional terms.

• Sentra — a verification-and-containment security API (defined in Section 3);

By creating an account, receiving an API key, purchasing credits, or otherwise using the Services, you agree to these Terms. If you are agreeing on behalf of a company, you represent that you are authorized to bind it.

2. Definitions

• Services — the ProofChain products listed above and any associated APIs, websites, and documentation.
• Sentra API — the HTTP API through which the Sentra Services are accessed.
• API Key — a secret credential we issue that authenticates your requests.
• Credits — prepaid units of usage purchased in advance (see Section 6).
• Customer Content — any data, parameters, code, or payloads you submit to the Services, including data you submit for verification or execution.
• Documentation — the usage guides we publish (e.g., the Sentra getting-started guide).

3. Description of the Sentra Services

Sentra is a security checkpoint that a Customer's own systems call before performing consequential actions. It provides two primary functions:

• /evaluate — returns a verdict (allow, contain, or block) and a risk score for a described action, to help the Customer decide whether to proceed.
• /run_in_seed — executes a Customer-supplied payload inside a sealed, disposable, network-isolated sandbox and returns the observed result.

Nature and limits of the Services. Sentra is a decision-support and containment tool that operates alongside a Customer's existing security controls. It is not a firewall, web application firewall (WAF), antivirus, intrusion prevention system, or a complete security solution, and it does not guarantee that any attack, breach, fraud, unauthorized action, or loss will be prevented or detected. Verdicts are advisory; the Customer remains solely responsible for how it acts on them and for its own security. See also the disclaimers in Section 11.

4. Accounts, API Keys, and security

• We issue API Keys to identify and authenticate your usage. You are responsible for keeping your API Key confidential and for all activity that occurs under it. Notify us immediately at mailframeapp@gmail.com if you believe a key is compromised; we will rotate it.
• You must provide accurate account and billing information and keep it current.
• You may not share, resell, or sublicense your API Key or access except as expressly permitted.

5. Acceptable Use

You agree not to use the Services, and not to permit anyone using your credentials to:

1. Violate any law, regulation, or third-party right;
2. Use /run_in_seed or any part of the Services to develop, test, stage, launch, or facilitate attacks against, or unauthorized access to, any system, network, or person; to distribute malware; to mine cryptocurrency; or to process content you are not lawfully entitled to process;
3. Submit content that is unlawful, infringing, or that you lack the rights or consents to submit;
4. Attempt to circumvent security, rate limits, Credit limits, or access controls; probe, scan, or reverse-engineer the Services except to the extent this restriction is prohibited by law;
5. Overload, disrupt, or impair the Services or the infrastructure of our providers;
6. Use the Services to build a competing product, or to benchmark for a competing product, without our written consent.

We may investigate suspected violations and suspend or terminate access for conduct we reasonably believe violates this Section or exposes us, our providers, or others to risk or liability.

6. Fees, Credits, and billing

• Prepaid Credits. Sentra is sold as one-time, prepaid Credit packs (currently: Starter, Growth, Scale, and custom Enterprise), priced in US Dollars. There is currently no recurring subscription. Published prices, pack sizes, and Credit consumption rates (e.g., 1 Credit per verification, 5 Credits per sandbox run) are set out on the Sentra pricing page and may change prospectively.
• Payment processing. Payments are processed by Stripe, Inc. ("Stripe"). By purchasing, you agree to Stripe's terms. We do not receive or store your full payment card details.
• Credit validity. Purchased Credits are valid for twelve (12) months from purchase and expire thereafter unless stated otherwise.
• No obligation to provide Service without Credits. We may decline or halt requests once your Credit balance is exhausted.
• Taxes. Prices are exclusive of taxes unless stated. You are responsible for applicable taxes; we may collect sales tax, VAT, or similar where required.
• Changes. We may change prices, packs, or Credit rates prospectively; changes do not affect Credits already purchased.

7. Refunds

All sales are final. Credits and other purchases are non-refundable once purchased — including Credits used in whole or in part, and expired Credits. We do not refund for change of mind, non-use, or dissatisfaction.

The only exceptions are:

• Duplicate or erroneous charges (e.g., the same purchase charged more than once), which we refund upon verification;
• Refunds required by applicable law.

By completing a purchase you acknowledge that access to the Services begins immediately and you agree to these no-refund terms. Where you are a consumer with a statutory right of withdrawal, by purchasing and requesting immediate access you expressly consent to the Services beginning immediately and acknowledge that you lose any right of withdrawal once the Services have been supplied.

8. Intellectual property

• Our IP. We and our licensors own all rights in the Services, software, and Documentation. We grant you a limited, non-exclusive, non-transferable, revocable license to use the Services per these Terms. No other rights are granted.
• Your Content. You retain all rights in Customer Content. You grant us a limited license to process Customer Content solely to provide and secure the Services. You represent you have the rights and consents necessary to submit Customer Content.
• Feedback. If you give us feedback, we may use it without restriction.

9. Customer Content and data protection

• For personal data contained in Customer Content that we process on your behalf, we act as a processor and you act as the controller; our handling is described in the Privacy Policy, and a Data Processing Agreement (DPA) is available on request.
• You are responsible for ensuring you have a lawful basis to submit Customer Content and for not submitting sensitive data you are not entitled to process.

10. Third-party services

The Services depend on third-party infrastructure and payment providers. Your use may be subject to their terms. We are not responsible for third-party services and are not liable for their acts, omissions, outages, or changes.

11. Disclaimers

THE SERVICES ARE PROVIDED "AS IS" AND "AS AVAILABLE," WITHOUT WARRANTIES OF ANY KIND, express or implied, including merchantability, fitness for a particular purpose, non-infringement, and any warranty that the Services will be uninterrupted, error-free, or secure.

Security-specific disclaimer. Without limiting the above, we do not warrant that Sentra will prevent, detect, contain, or mitigate any particular attack, breach, fraud, malicious action, or loss. Verdicts and containment are advisory and probabilistic aids that supplement — and do not replace — your own security program. You are solely responsible for your systems, decisions, and compliance.

12. Limitation of liability

To the maximum extent permitted by law:

• No indirect damages. We are not liable for indirect, incidental, special, consequential, exemplary, or punitive damages, or for lost profits, revenue, data, goodwill, or business, arising from or relating to the Services.
• Liability cap. Our total aggregate liability arising out of or relating to the Services or these Terms will not exceed the greater of (a) the amounts you paid to us for the applicable Service in the 3 months before the event giving rise to the claim, or (b) US$100.
• Basis of the bargain. These limits apply even if a remedy fails of its essential purpose and reflect the allocation of risk between the parties. Nothing excludes liability that cannot be excluded by law.

13. Indemnification

You will defend and indemnify ProofChain against third-party claims and losses arising from your Customer Content, your use of the Services, or your breach of these Terms or the Acceptable Use section.

14. Suspension, termination, and effect

• You may stop using the Services at any time. We may suspend or terminate access for breach, risk, non-payment, or as required by law.
• On termination, your license ends and you must stop using the Services. Sections that by their nature survive (e.g., fees owed, IP, disclaimers, liability, indemnity, governing law) survive termination.
• Unused Credits on termination are handled per Section 7.

15. Changes to the Services and these Terms

We may modify the Services or these Terms. For material changes we will take reasonable steps to notify you (e.g., by posting an updated date or by email). Continued use after changes take effect constitutes acceptance.

16. Governing law and disputes

These Terms are governed by the laws of the State of Wyoming, USA, without regard to conflict-of-laws rules. The parties submit to the exclusive jurisdiction of the state and federal courts located in Wyoming.

17. Miscellaneous

Entire agreement; severability; no waiver; no assignment by you without our consent; force majeure; notices to mailframeapp@gmail.com and to ProofChain LLC, 5830 E 2nd St, Ste 7000 #38324, Casper, Wyoming 82609, USA. If any provision is unenforceable, the rest remains in effect.

18. Contact

ProofChain LLC — mailframeapp@gmail.com — 5830 E 2nd St, Ste 7000 #38324, Casper, Wyoming 82609, USA.