Liskov Master Business Terms
Version 1.0 — effective 1 September 2026
Business customers only
These Master Business Terms (the Terms) are a legal agreement between:
- MOOSE LABS LTD, company number 11435949, a private limited company registered in England and Wales with its registered office at The Old Bakery, Camden Road, Tunbridge Wells, England, TN1 2QP, VAT registration GB311456142, trading as PROOF (PROOF, we, us or our) and contactable at hello@proof.computer; and
- the person identified as the customer in an Order (Customer, you or your).
The individual accepting these Terms for Customer confirms that they have authority to bind Customer.
1. Definitions
In these Terms:
Acceptable Use Policy or AUP means the then-current Liskov Acceptable Use Policy incorporated into the Contract.
Account Data means information relating to Customer’s organisation, authorised users, billing, authentication, service administration, support, security and use of the Services.
Affiliate means an entity that directly or indirectly controls, is controlled by, or is under common control with a party, where control means ownership of more than 50% of voting rights or the power to direct management.
Application means software, code, configuration, container, package, template, integration, model, script or other material deployed, submitted, published or made available by or for Customer through the Services.
Authorised User means an individual whom Customer authorises to use its Workspace.
Business Day means a day other than a Saturday, Sunday or public holiday in England when banks in London are generally open for business.
Confidential Information means information disclosed by or on behalf of a party that is marked confidential or that a reasonable business person would understand to be confidential given its nature and the circumstances of disclosure. It includes non-public product, security, financial, commercial and technical information, Customer Data, and the terms of a non-public Order. It does not include information that the receiving party can demonstrate: (a) is or becomes public other than through breach; (b) was lawfully known without restriction before disclosure; (c) is received lawfully from a third party without confidentiality duty; or (d) is independently developed without use of the disclosing party’s Confidential Information.
Contract means the agreement comprising these Terms, each applicable Order and each document expressly incorporated under clause 2.3.
Customer Content means Applications, Customer Data, Marketplace submissions, instructions, configurations, domains, marks and other content supplied, controlled or made available by or for Customer, but excludes Account Data for which PROOF acts as an independent controller and excludes PROOF Technology.
Customer Data means data submitted to or generated within the hosted, PROOF-controlled parts of the Services on Customer’s behalf, excluding Distributed Workload Data, public blockchain records and PROOF’s own service, security and billing records.
Data Protection Laws means the UK GDPR, the Data Protection Act 2018, the Privacy and Electronic Communications Regulations 2003, the Data (Use and Access) Act 2025 to the extent in force, and other data-protection or e-privacy law applicable to a party’s processing under the Contract, each as amended or replaced.
Data Processing Addendum or DPA means the Liskov Data Processing Addendum incorporated into the Contract where PROOF processes Personal Data on Customer’s behalf.
Distributed Workload means an Application, task, process or job submitted through the Services for execution, storage, relay or other handling using Network Infrastructure.
Distributed Workload Data means code, input, output, state, metadata, traffic or other data contained in, transmitted to or generated by a Distributed Workload.
Documentation means user and technical documentation that PROOF makes available for the Services.
Enterprise Order means an Order signed by both parties that expressly varies these Terms.
Eligible Services means Services that the Order, pricing page or console states may be purchased using Service Credits.
Fees means Subscription Fees, usage charges, Launch Fees, Network Costs and other amounts payable under an Order, excluding taxes unless expressly stated otherwise.
Free Service means a Service supplied without Fees, including a trial, preview or free plan.
Launch means a Customer-authorised deployment or allocation of Network Infrastructure initiated through the Services.
Launch Fee means the platform fee, if any, calculated in the manner stated in the Order or pricing page by reference to a Launch, Network Spend or other stated usage measure.
Marketplace means the Liskov catalogue or discovery service for Applications, templates, integrations or related materials.
Marketplace Terms means the then-current Liskov Free Marketplace Publisher and User Terms incorporated into the Contract where Customer uses or publishes through the Marketplace.
Network means Acurast or another decentralised, blockchain-based, peer-to-peer or third-party compute, storage, routing or infrastructure protocol used in connection with the Services.
Network Costs means amounts charged or economically incurred to obtain Network Infrastructure, including network execution charges, gas, protocol charges and third-party capacity costs, as described in the Order or console.
Network Infrastructure means compute, storage, connectivity, blockchain, node, RPC, bridge, oracle or other infrastructure supplied or operated through a Network or by a Network Participant rather than by PROOF itself.
Network Participant means a node operator, validator, protocol participant, bridge, oracle, RPC operator, token issuer, exchange, liquidity provider or other person participating in or supporting a Network.
Order means the commercial terms for a Service that Customer selects and accepts through the console (including by paying for a subscription plan or purchasing Service Credits) or that the parties sign. An Order accepted through the console comprises the plan, price, tax basis, renewal terms and usage rates displayed at the time of acceptance.
Personal Data, Controller, Processor, Process, Data Subject, Personal Data Breach and Special Category Data have the meanings given in applicable Data Protection Laws.
Policies means the AUP, Service Credits and Payments Policy, Marketplace Terms, Notice-and-Action Policy and other product policy expressly incorporated into an Order or these Terms.
PROOF Technology means the Services, Documentation, PROOF software, APIs, workflows, designs, models, inventions, know-how, data schemas and other technology owned or licensed by PROOF, including modifications and derivative works, but excluding Customer Content and third-party open-source software.
Service Credits means non-transferable contractual units recorded by PROOF as a prepayment, promotional allowance or service adjustment for Eligible Services, subject to the Service Credits and Payments Policy.
Services means the Liskov hosted control plane, APIs, console, orchestration, deployment, routing, billing, support and other services identified in an Order. Services do not include Network Infrastructure except to the extent the Order expressly states that PROOF supplies specified capacity as principal.
Self-Custody Option means the optional arrangement described in clause 5.4 under which Customer funds, and signs for, its own Network account.
Standard Service means the Services as supplied under a self-service plan without an Enterprise Order.
Subscription Fees means recurring fixed Fees for a subscription plan.
Term has the meaning in clause 17.
UK GDPR has the meaning given in the Data Protection Act 2018.
Website means the PROOF or Liskov website through which the Services are offered.
Workspace means Customer’s logical Liskov account or tenant.
2. The Contract
2.1 Business use only
The Services are offered only to persons acting wholly or mainly for purposes relating to their trade, business, craft or profession. Customer represents on entering each Order and throughout the Term that:
(a) it is not acting as a consumer;
(b) it has legal capacity and authority to enter the Contract;
(c) each person accepting an Order or administering the Workspace is authorised to do so; and
(d) it will not permit a person under 18 to use the Services.
Customer must notify PROOF promptly if any representation becomes inaccurate. PROOF may refuse or suspend an account that appears to be used mainly for personal, family or household purposes. The Services are not available for consumer use. The Services are available to business customers established in any country, subject to clause 22.
2.2 Formation
These Terms bind Customer when its authorised representative affirmatively accepts them through the console to create a Workspace. An Order becomes part of the Contract when the first of the following occurs: (a) both parties sign it; or (b) Customer selects a subscription plan or purchases Service Credits through the console after being shown the plan, price, tax basis, renewal terms and usage rates. A change of plan through the console forms a new Order on the same basis. No separate acceptance control is required for an Order formed through the console. An Order placed by Customer is subject to PROOF’s acceptance.
2.3 Incorporated documents and precedence
The Contract includes, as applicable:
(a) the Order;
(b) the DPA, for processing of Personal Data on Customer’s behalf;
(c) any Service Level Agreement or Security Schedule expressly incorporated in the Order;
(d) these Terms;
(e) the Service Credits and Payments Policy;
(f) the AUP; and
(g) the Marketplace Terms and Notice-and-Action Policy where Customer uses the Marketplace.
If there is a conflict, the documents prevail in the order above, except that the DPA prevails over all other Contract documents only for data-protection matters. A purchase order or Customer standard term is for administrative convenience only and does not amend the Contract, even if PROOF accepts or references it.
2.4 Affiliates
An Affiliate may buy Services under its own Order. Each Order is a separate contract between PROOF and the Affiliate identified as customer. Customer is responsible for Affiliate use under Customer’s Order and may not extend rights to an Affiliate beyond the Order’s scope.
3. Services
3.1 Supply
Subject to the Contract, PROOF will supply the Services during the Term with reasonable skill and care and materially in accordance with the applicable Documentation. Customer receives a non-exclusive, non-transferable right for its Authorised Users to access and use the Services for Customer’s internal business purposes and to provide Customer’s own products or services, within the Order limits.
3.2 Changes to Services
PROOF may modify the Services to improve them, address security or abuse, comply with law, accommodate Network changes, or replace features. PROOF will not materially reduce the core paid functionality during a committed subscription period without reasonable notice, except where necessary for security, law, third-party rights or a Network event outside PROOF’s reasonable control. If a non-emergency change materially removes core paid functionality and PROOF cannot offer a reasonable substitute, Customer may terminate the affected Service within 30 days of notice and receive a pro-rata refund of prepaid Subscription Fees for the unused period and any refundable Service Credits under the Credits Policy.
3.3 Limits
Usage, users, Workspaces, projects, deployments, API requests, storage, support and other limits are stated in the Order, Documentation or console. PROOF may use reasonable technical controls to enforce them. Customer must not split accounts or otherwise circumvent a limit.
3.4 Dependencies and interoperability
Customer is responsible for obtaining and maintaining compatible equipment, internet connectivity, domains, wallets, software, accounts and third-party permissions. PROOF may publish supported versions and deprecation notices. Unless an Order states otherwise, PROOF does not guarantee perpetual compatibility with any Network, blockchain, wallet, API, operating system, package or third-party service.
3.5 Support
PROOF will provide support stated in the Order. Standard support targets are goals unless expressly described as binding service levels. Customer must provide sufficient information, safe reproduction steps and reasonable cooperation. PROOF may refuse to handle live secrets, private keys or unlawful content through ordinary support channels.
3.6 Preview and beta services
A Service labelled alpha, beta, preview, experimental, evaluation or similar is optional, may be changed or withdrawn at any time, may be incomplete and is not intended for production or safety-critical use. Unless the Order expressly says otherwise, no service level applies to it. Liability exclusions and caps still remain subject to applicable law.
3.7 Availability target
PROOF designs the Liskov control plane for high availability and targets 99.95% monthly availability for the production API and console. The target is a design goal, not a service level, warranty, refund or credit commitment, unless an Enterprise Order expressly makes it one. Network Infrastructure, Network Participants, RPC endpoints and third-party services are outside the target, and it does not measure whether a particular job is accepted, starts, continues or succeeds.
4. Network Infrastructure and decentralised execution
4.1 Distinct supply layers
Liskov may allow Customer to request or orchestrate Network Infrastructure. Network Infrastructure is technically and operationally distinct from PROOF-controlled Services. Network Participants are generally independent persons whom PROOF does not employ, own or control. Nothing in the Contract creates an agency, partnership, fiduciary, employment or joint-venture relationship between Customer and PROOF or between PROOF and a Network Participant.
4.2 Procurement as principal
Unless an Order expressly states otherwise, where PROOF acquires tokens, capacity or upstream services to fulfil a Launch, PROOF does so in its own name and as principal. Customer buys the applicable Liskov service or capacity from PROOF and does not acquire a proprietary or beneficial interest in any bank account, wallet, token or upstream contract held by PROOF. PROOF does not receive money or cryptoassets to transmit them as Customer’s agent to a Network Participant.
4.3 Network risk
Customer acknowledges that Network Infrastructure may be geographically distributed and subject to protocol rules and events outside PROOF’s reasonable control. Without limiting PROOF’s responsibility for its own breach, Network Infrastructure may:
(a) be supplied by changing or unidentified Network Participants;
(b) operate in, route through or replicate data across unknown countries;
(c) be unavailable, delayed, congested, interrupted, duplicated, reordered, forked, rolled back or permanently stopped;
(d) return incomplete, malicious or incorrect results;
(e) expose code, data, metadata, credentials or traffic if technical isolation or Customer safeguards fail;
(f) change fees, token requirements, consensus, interfaces or eligibility rules;
(g) be affected by software defects, attacks, slashing, governance, market conditions or legal restrictions; and
(h) make transactions or records irreversible or publicly visible.
Customer must assess whether the architecture is suitable for each workload, use verification and redundancy appropriate to the risk, maintain its own recoverable source and data, and avoid relying on a single execution result for a high-impact decision.
4.4 No location or identity assurance
Unless an Enterprise Order expressly identifies an approved node pool and location commitment, PROOF does not warrant the identity, ownership, security, trustworthiness or location of a Network Participant or the country in which a Distributed Workload is executed or observed. PROOF may display a best-effort location for a Network Participant derived from its network address; that information is provided for convenience only and is not a commitment.
4.5 Upstream rules
Customer must comply with Network rules and third-party terms notified through the Documentation or Order. PROOF may stop supporting a Network or suspend a Launch where continued use would breach law, third-party terms, security requirements or the AUP. PROOF will use reasonable efforts to give advance notice where practicable.
4.6 Customer verification
Customer remains responsible for validating Distributed Workload inputs and outputs, cryptographic proofs, signatures, addresses, chain identifiers, token contracts, gas parameters and deployment instructions before relying on them. PROOF is not responsible for an incorrect instruction that the Services execute as submitted, except to the extent the error was caused by PROOF’s breach.
4.7 Confidential execution design
Acurast processors are designed to execute a Distributed Workload inside a hardware-backed trusted execution environment so that the processor operator does not have access to the workload’s code, inputs, outputs, secrets or logs. PROOF does not operate the processors and does not warrant that this isolation is effective in every case. Clause 4.3 applies, and Customer must treat a Distributed Workload as potentially observable by a Network Participant if that isolation fails.
4.8 Chain-scheduled jobs
A Launch creates a job scheduled on the Network for its stated period. PROOF may suspend or terminate the Services independently of that job. PROOF does not force-stop a scheduled job before its scheduled end; where an Application’s runtime supports it, Customer may end the Application early through the Services. Suspension or termination of the Services does not by itself stop, reverse or refund a job already committed to the Network.
5. Accounts and access
5.1 Registration
Customer must provide accurate and current registration, billing and compliance information and keep it updated. PROOF may verify Customer’s identity, organisation, authority, location, payment method and sanctions status, directly or through a service provider.
5.2 Authorised Users
Customer controls access to its Workspace and is responsible for acts and omissions of Authorised Users as if they were Customer’s own. Customer must promptly remove access that is no longer required and review privileged access regularly.
5.3 Credentials and keys
Customer must protect passwords, API keys, tokens, signing devices, private keys, seed phrases and recovery materials; use multi-factor authentication where available; apply least privilege; and notify PROOF promptly of suspected compromise. Customer must not share individual credentials or place private keys, seed phrases or unrestricted production secrets in a Distributed Workload, support ticket, Marketplace listing or source repository.
5.4 Customer wallets and the Self-Custody Option
Where the Services connect to a customer-controlled wallet or Network account, Customer remains solely responsible for the wallet, private keys and transaction approval. PROOF never stores, recovers, uses or signs with a Customer private key. On-chain transactions may be irreversible.
Where Customer uses the Self-Custody Option:
(a) Customer holds and funds its own Network account and runs the supported signer software on infrastructure it controls; the private key never leaves Customer-controlled infrastructure;
(b) the Services propose unsigned, bounded deployment-lifecycle transactions, and Customer’s signer independently checks, limits, signs and submits them directly to a Network RPC endpoint; PROOF signs only with its own service accounts;
(c) PROOF cannot recover the key, reverse a transaction, or substitute managed custody for the Self-Custody Option without Customer’s instruction;
(d) Customer is responsible for the security of the signer host, key backup and recovery, availability, RPC endpoint choice, account funding, spending limits, finality monitoring, and the tax and compliance treatment of its own tokens; and
(e) Customer’s tokens remain external to the Services, and PROOF’s charges for the Services remain Fees or Service Credit charges under the applicable Order.
The Self-Custody Option is a preview Service under clause 3.6.
5.5 Account security events
PROOF may require credential reset, key rotation, additional verification or temporary access restriction where reasonably necessary to protect Customer, PROOF, Networks or third parties. Customer will provide reasonable cooperation with an investigation.
6. Customer responsibilities
Customer must:
(a) use the Services only in accordance with the Contract, Documentation and law;
(b) ensure Customer Content and instructions are accurate, lawful and appropriately secured;
(c) obtain all rights, notices, consents, licences and permits needed for Customer Content and processing;
(d) configure Applications and access controls securely and apply updates and dependency fixes;
(e) maintain independent backups and recovery procedures proportionate to its risk;
(f) assess Distributed Workload suitability and validate outputs;
(g) not rely on PROOF for legal, tax, financial, investment, security or regulatory advice;
(h) cooperate with reasonable abuse, security, sanctions, billing and compliance enquiries;
(i) be responsible for its users, customers and persons accessing an Application; and
(j) comply with the AUP.
Customer is responsible for its Application and any product or service it supplies using Liskov, including end-user terms, privacy information, support, sector compliance, taxes and claims.
7. Distributed Workload Data
7.1 Customer responsibility
A Distributed Workload under the Standard Service runs on independently operated Network Infrastructure, not on PROOF systems. PROOF does not receive, store, inspect or control Distributed Workload Data and cannot technically enforce restrictions on its contents. As between the parties, Customer is the sole Controller of any Personal Data in Distributed Workload Data, and PROOF is neither Controller nor Processor of it. Customer directs the transmission of Distributed Workload Data to the Network, must satisfy itself that the architecture is lawful and suitable for the data concerned (including minimisation, encryption, notices, lawful basis, international transfer and residency requirements), and is the exporter for any international transfer that results. An Enterprise Order may add data commitments; nothing else does.
7.2 Prohibited workload data
Customer must not include or permit the following in Distributed Workload Data:
(a) cardholder data, bank credentials or other regulated payment data;
(b) private keys, seed phrases, unrestricted credentials, authentication secrets or cryptographic material whose disclosure would allow unauthorised access or transfer;
(c) data that is subject to a contractual or legal requirement to be processed only in a named location or only in the United Kingdom; or
(d) classified, export-controlled or regulated technical data that may not lawfully be processed in an unknown country.
7.3 Accidental submission
If Customer becomes aware that data listed in clause 7.2 has been submitted, it must stop the affected workload where possible, revoke or rotate the affected credentials, notify PROOF at security@proof.computer and provide the information reasonably needed to contain and assess the event. PROOF may suspend the workload and preserve limited evidence where necessary for security or law.
7.4 Encryption
Encryption, hashing, tokenisation or pseudonymisation does not remove Customer’s obligations where the data remains Personal Data or regulated data for a party. Customer is responsible for its key architecture and should not transmit decryption keys with the same workload.
8. Customer Content and data licence
8.1 Ownership
As between the parties, Customer retains ownership of Customer Content. PROOF retains ownership of PROOF Technology. No rights transfer except as expressly stated.
8.2 Operational licence
Customer grants PROOF and its authorised subcontractors a non-exclusive, worldwide, royalty-free licence during the Term, and for the limited exit/retention period, to host, copy, transmit, format, scan, test, display and otherwise use Customer Content only as reasonably necessary to:
(a) supply, secure, support and improve the Services for Customer;
(b) prevent or investigate abuse, fraud and security threats;
(c) comply with Customer instructions and the Contract; and
(d) comply with law and enforce legal rights.
The licence includes the right to transmit Distributed Workload Data to Network Infrastructure where Customer initiates or configures that transmission. It does not give PROOF a right to train a general-purpose model on Customer’s source code or private content without separate express agreement.
8.3 Aggregated data
PROOF may generate and use statistics and insights derived from Service use where they do not identify Customer, an Authorised User or another person and cannot reasonably be used to reconstruct Customer Content. PROOF may use such de-identified aggregate information for security, capacity planning, benchmarking and product improvement.
8.4 Feedback
If Customer voluntarily provides feedback or suggestions, Customer grants PROOF a perpetual, irrevocable, worldwide, royalty-free licence to use them without restriction or attribution, provided PROOF does not identify Customer or disclose Customer Confidential Information without permission.
8.5 Removal
PROOF may remove or restrict Customer Content that it reasonably believes breaches the Contract, law or third-party rights, or creates a security risk. Where lawful and practicable, PROOF will notify Customer and allow a reasonable opportunity to respond. The Marketplace Notice-and-Action Policy applies to public submissions.
9. Data protection
9.1 Compliance
Each party will comply with Data Protection Laws applicable to its processing under the Contract.
9.2 Controller activities
PROOF acts as an independent Controller for Account Data and other Personal Data it processes for account administration, billing, security, fraud prevention, compliance, service analytics, communications and its own business records, as described in the Privacy Notice.
9.3 Processor activities
Where PROOF processes Personal Data contained in Customer Data solely on Customer’s documented instructions to provide hosted Services (application configuration, managed logs, sealed secrets and uploaded artifacts), the DPA applies. The DPA does not apply to Distributed Workload Data, for which Customer is the sole Controller under clause 7.
9.4 Customer obligations
Customer warrants that its instructions and provision of Personal Data comply with Data Protection Laws and that it has given required notices and obtained required rights. Customer must not instruct PROOF to process Personal Data in violation of the Contract.
9.5 Public-chain data
Customer acknowledges that a public blockchain may permanently publish and globally replicate wallet addresses, transaction data and other metadata. Customer must minimise Personal Data in on-chain records and must not place direct identifiers or payload content on-chain unless lawfully justified and necessary. PROOF cannot erase or alter a record controlled by an independent public network.
10. Security
10.1 PROOF measures
PROOF will maintain technical and organisational measures appropriate to the risk for the PROOF-controlled Services, as described in the DPA or an incorporated Security Schedule. No general security statement expands a binding measure beyond its stated scope.
10.2 Shared responsibility
Customer is responsible for security of Customer-controlled systems, Applications, code, dependencies, identities, endpoints, wallets, keys, payloads, outputs and configurations. Customer must promptly install relevant updates, rotate compromised credentials and follow material security notices.
10.3 Security reports
Customer must report a suspected vulnerability or compromise to security@proof.computer and must not publicly disclose an unremediated vulnerability in a manner that creates avoidable harm. Good-faith research remains subject to the AUP and any published vulnerability disclosure policy.
10.4 No absolute security
No service or decentralised network is completely secure. Neither technical isolation nor cryptography is a guarantee against all access, disclosure, alteration or loss. This clause does not exclude PROOF’s obligation to use reasonable skill and care or its liability that cannot lawfully be excluded.
11. Marketplace
11.1 Application of Marketplace Terms
Use of the Marketplace is subject to the Marketplace Terms and Notice-and-Action Policy. If there is a conflict relating specifically to publication or use of a Marketplace item, the Marketplace Terms prevail over these Terms, subject to the precedence in clause 2.3.
11.2 Free-only service
At the date of these Terms every Marketplace item is published by PROOF and made available without a purchase price under its stated licence. Unless a later Order and separate paid-marketplace terms expressly say otherwise, Marketplace items are listed and made available without a purchase price through Liskov. PROOF does not collect payment for a publisher, pay a publisher, or act as agent in a transaction between Customer and a publisher.
11.3 Source and third-party items
Every Marketplace listing identifies the item’s public source repository and immutable version. Where PROOF later admits independent publishers, an item may be supplied by an independent publisher under its stated licence; PROOF does not own it merely because it is listed. Customer must review the licence, source, dependencies, permissions, security and suitability before use. Scanning, curation, an evidence label or a badge is not a warranty that an item is secure, accurate, maintained, lawful or fit for purpose.
11.4 No circumvention
A publisher must not use a free listing to require an undisclosed payment for the listed core functionality or to route a transaction through Liskov without approved paid-marketplace terms. This does not prohibit clearly disclosed charges for an independent external service where the listing remains compliant and PROOF approves the disclosure.
12. Fees and billing
12.1 Fees
Customer will pay the Fees stated in each Order. Except where an Order says otherwise:
(a) Subscription Fees are billed in advance;
(b) usage charges, Launch Fees and Network Costs may be billed in arrears, deducted from Service Credits, or both as clearly shown in the console;
(c) Fees are exclusive of VAT and similar taxes;
(d) Fees are non-cancellable and non-refundable except as expressly stated in the Contract; and
(e) Customer bears bank, card and payment-provider charges imposed on Customer.
12.2 Variable Network Costs
Network Costs can change rapidly and an estimate is not a fixed quote unless expressly stated. The console will show the applicable rate or calculation method before Customer authorises a Launch where reasonably practicable. Customer authorises PROOF to consume Service Credits or charge the approved payment method for actual Network Costs and applicable Fees up to any spending limit Customer sets. PROOF must not deliberately exceed a hard limit configured and confirmed by the Services, but a Network event, final settlement or already-committed job may cause a limited overrun described in the Documentation.
12.3 Invoices and disputes
Invoices are due on the date stated in the Order or, if unstated, 14 days after invoice date. Customer must raise a good-faith billing dispute within 30 days after the relevant invoice or ledger entry and provide reasonable detail. The parties will work promptly to resolve it. Customer must pay undisputed amounts on time.
12.4 Late payment
For overdue undisputed amounts, PROOF may charge interest and recovery costs available under the Late Payment of Commercial Debts (Interest) Act 1998 or, where that Act does not apply, interest at 4% per year above the Bank of England base rate, accruing daily. PROOF may suspend paid Services after giving at least 7 days’ notice of an overdue undisputed amount, unless urgent action is reasonably necessary to prevent loss or abuse.
12.5 Taxes
Customer is responsible for taxes arising from its purchases or use other than taxes on PROOF’s net income. PROOF adds UK VAT at the applicable rate where Customer’s billing address is in the United Kingdom, whether or not Customer is VAT-registered. A supply to a business customer with a billing address outside the United Kingdom is outside the scope of UK VAT, and Customer accounts for any tax due in its own country, including under a reverse-charge mechanism where one applies. Tax is calculated at checkout by PROOF’s payment provider from the billing address and any VAT number Customer supplies. If Customer must withhold tax, it will provide valid evidence and, unless prohibited by law, gross up the payment so PROOF receives the amount it would have received without withholding. Customer is responsible for its own tax treatment of the Services, of its Applications and end-user transactions, and of any tokens it holds or uses under the Self-Custody Option.
12.6 Payment providers
Payment processing may be supplied by a third party under its own terms. PROOF may receive payment status and limited payment information but need not store full card details. A payment-provider failure does not discharge Customer’s valid payment obligation.
13. Service Credits
13.1 Credits Policy
Service Credits are governed by the Service Credits and Payments Policy. Credits are an accounting mechanism for Eligible Services, not a separate general-purpose payment product.
13.2 No transfer or third-party use
Customer may not sell, assign, transfer, pledge, exchange, withdraw, sublicense or use Service Credits outside its Workspace or with any person other than PROOF. Credits cannot be used to pay a Marketplace publisher, Network Participant or another customer.
13.3 No trust, safeguarding or specific asset
Amounts received for Service Credits are not held on trust, segregated or safeguarded for Customer unless an Order expressly says so following legal review. Customer has no property right in a specific bank balance, token or wallet. If PROOF becomes insolvent, an unused paid Credit balance would ordinarily be an unsecured contractual claim, subject to applicable insolvency law.
13.4 Payment methods and no investment relationship
PROOF accepts payment only through the payment methods shown at checkout, which are supplied by PROOF’s payment provider. PROOF does not accept cryptoassets as payment. PROOF may reject or pause a payment method for security, legal, sanctions or fraud reasons. Service Credits and the Services are not an investment, deposit, security, savings product or promise of return, and PROOF does not advise Customer on acquiring, holding or disposing of any cryptoasset.
14. Intellectual property
14.1 PROOF Technology
PROOF and its licensors own all rights in PROOF Technology. Except for the limited access right in clause 3.1, no right is granted by implication, estoppel or otherwise.
14.2 Restrictions
Except to the extent law does not permit restriction, Customer must not:
(a) copy, modify, translate or create derivative works of proprietary PROOF Technology;
(b) reverse engineer, decompile or attempt to discover non-public source code, models or algorithms;
(c) resell, sublicense, time-share or provide the Services as a standalone service bureau except where the Order permits Customer to embed or use them in Customer’s own service;
(d) remove proprietary notices;
(e) access the Services to build or benchmark a materially competing service for publication without consent;
(f) scrape or systematically extract non-public data except through documented APIs; or
(g) bypass technical controls.
This clause does not restrict rights under an applicable open-source licence.
14.3 Open-source software
Third-party open-source components are governed by their applicable licences. To the extent an open-source licence conflicts with the Contract for that component, the open-source licence controls. PROOF will make notices or source available where required.
14.4 Customer marks
PROOF may not use Customer’s name or logo in public marketing without prior consent, except to identify Customer privately for service administration or as required by law. Any approved use must follow Customer’s reasonable brand guidelines.
15. Confidentiality
15.1 Duties
The receiving party will:
(a) use the disclosing party’s Confidential Information only to perform or exercise rights under the Contract;
(b) protect it with at least reasonable care and no less care than it uses for its own similar information;
(c) disclose it only to personnel, Affiliates, professional advisers and subcontractors who need to know it and are bound by confidentiality obligations; and
(d) remain responsible for those recipients’ compliance, except independent professional advisers who owe their own duties.
15.2 Compelled disclosure
The receiving party may disclose Confidential Information where required by law, court or regulator, provided it gives advance notice where lawful and reasonable assistance at the disclosing party’s cost to seek protection.
15.3 Network disclosure authorised by Customer
Transmission of Distributed Workload Data to Network Infrastructure as configured or initiated by Customer is an authorised operational disclosure for the purpose of the Contract, not a breach by itself. This does not relieve PROOF from obligations expressly assumed in an Enterprise Order, or from responsibility for disclosure caused by its own breach.
15.4 Injunctive relief
Unauthorised disclosure may cause harm not adequately remedied by damages. A party may seek injunctive or equitable relief in addition to other remedies.
15.5 Duration
Confidentiality obligations continue for five years after termination, except for trade secrets and Personal Data, which remain protected for as long as they retain that character or applicable law requires.
16. Acceptable use, monitoring and suspension
16.1 AUP
Customer and its users must comply with the AUP. Customer must not enable an end user to use Liskov in a manner that would breach the AUP if done by Customer.
16.2 Proportionate monitoring
PROOF may process service metadata, logs, public content and limited technical indicators as reasonably necessary to operate, secure, bill and enforce the Services. PROOF does not undertake a general duty to monitor all Customer Content. Any inspection of payload content must be proportionate, authorised by the Contract or law, and handled in accordance with the Privacy Notice and DPA.
16.3 Suspension grounds
PROOF may suspend or restrict all or part of the Services where it reasonably believes:
(a) Customer has materially breached the Contract;
(b) use creates an urgent security, operational, sanctions or legal risk;
(c) Customer’s payment is overdue and clause 12.4 applies;
(d) suspension is required by law, regulator, court, payment provider or Network rule;
(e) Customer’s use threatens the Services, a Network or third party; or
(f) information needed for compliance verification is materially false or not provided.
16.4 Process
Where practicable and lawful, PROOF will give notice, explain the general reason and limit suspension to the affected Service or workload. PROOF may act without prior notice in an emergency. PROOF will restore access when the reason is resolved, subject to reasonable verification. Customer may use the appeal route in the AUP or Notice-and-Action Policy.
16.5 Costs
Customer remains responsible for Fees and non-cancellable Network Costs incurred before or during a suspension caused by Customer, but PROOF will not charge Subscription Fees for a prolonged suspension caused solely by PROOF’s breach.
17. Term, renewal and termination
17.1 Term
The Contract starts on the effective date of the first Order and continues until all Orders have expired or terminated. Each subscription runs for the initial period stated in the Order. If the Order provides for automatic renewal, it renews for successive periods of the stated length unless either party gives the required non-renewal notice. If no notice period is stated, notice must be given before the next renewal date and takes effect at the end of the current paid period.
17.2 Customer termination for convenience
Customer may cancel a monthly self-service plan through the console at any time, effective at the end of the current billing period. A committed or annual Order may be terminated for convenience only if the Order permits it. Fees for the current committed period are not refundable except as expressly stated.
17.3 Termination for cause
Either party may terminate an affected Order immediately by written notice if the other party:
(a) commits a material breach and, where capable of remedy, fails to remedy it within 30 days after written notice;
(b) suffers an insolvency event, ceases or threatens to cease business, or is unable to pay debts as they fall due, except where prohibited by insolvency law; or
(c) repeatedly breaches the Contract in a way that reasonably shows it does not intend to comply.
PROOF may terminate immediately for a serious AUP, sanctions, fraud, security or illegal-use breach that is not reasonably capable of safe cure.
17.4 Discontinuation
PROOF may discontinue a paid Service on at least 60 days’ notice. If discontinuation takes effect before the end of a prepaid committed period and no reasonably equivalent replacement is offered, PROOF will refund prepaid Subscription Fees for the unused period and refundable Service Credits. This does not require PROOF to continue a Service where law, security or an upstream Network makes continuation impracticable; PROOF will give as much notice as reasonably possible. If PROOF terminates the Contract or discontinues the Services other than for Customer’s breach, a sanctions restriction or a legal prohibition, PROOF will refund unused paid Service Credits under the Credits Policy.
17.5 Consequences
On termination or expiry:
(a) Customer’s access right ends, subject to clause 18;
(b) Customer must pay accrued Fees and non-cancellable commitments;
(c) each party must return or destroy the other’s Confidential Information on request, subject to clause 18, backups, law and legitimate record retention;
(d) refundable Service Credits are handled under the Credits Policy; and
(e) clauses intended by nature to survive do so, including payment, IP, confidentiality, data protection, disclaimers, liability, dispute and general clauses.
Termination of one Order does not terminate another unless stated.
18. Data export and deletion
18.1 Export window
During the Term, Customer may export Customer Data using available tools. Unless an Order states otherwise, following termination Customer may request reasonable access to export available Customer Data for 30 days, provided all undisputed amounts are paid and access is lawful and secure. PROOF may provide an export instead of restoring console access.
18.2 Deletion timetable
Subject to law, security, dispute preservation and Customer instructions under the DPA, PROOF will delete Customer Data from active PROOF-controlled systems no later than 60 days after termination and will overwrite residual backup copies in the ordinary cycle within 90 days after termination. Data retained after termination remains protected and is not used for other purposes.
18.3 Network and public records
PROOF cannot guarantee deletion from Network Participants, public blockchains, customer-controlled systems or third-party services outside its control. Customer must not submit data that requires guaranteed deletion to a Distributed Workload.
18.4 Assistance
Non-standard export, migration or recovery assistance is chargeable at agreed rates. PROOF is not required to recreate data Customer failed to back up or to keep a discontinued format indefinitely.
19. Warranties and disclaimers
19.1 Mutual authority
Each party warrants that it has authority to enter and perform the Contract.
19.2 PROOF warranty
PROOF warrants that paid Services will be supplied with reasonable skill and care and will materially conform to applicable Documentation. If Customer gives prompt detail of a reproducible breach, PROOF will use reasonable efforts to correct it or provide a workaround. If PROOF cannot do so within a reasonable period and the breach materially prevents use, Customer may terminate the affected Service and receive a pro-rata refund of prepaid Subscription Fees for the unusable period. This is Customer’s primary contractual remedy for breach of this warranty, without limiting rights that cannot lawfully be excluded.
19.3 Customer warranties
Customer warrants that it has all rights needed for Customer Content and that Customer Content, Applications and instructions will not knowingly infringe third-party rights or breach law or the AUP.
19.4 Disclaimers
Except as expressly stated and to the maximum extent permitted by law:
(a) Services, Free Services, Marketplace items and Network Infrastructure are provided without other express or implied warranty, including satisfactory quality, fitness for a particular purpose, non-infringement or uninterrupted/error-free operation;
(b) PROOF does not warrant a particular node, geography, token price, Network fee, result, execution time, profitability, saving, revenue or regulatory outcome;
(c) PROOF does not warrant that a Marketplace item or Network Participant is secure, maintained, accurate or suitable;
(d) forecasts, estimates, dashboards, proofs and monitoring are informational and Customer must verify material decisions; and
(e) PROOF is not a legal, tax, financial, investment or regulated-sector adviser.
Nothing in this clause excludes the express reasonable-skill-and-care warranty or a term that cannot lawfully be excluded.
20. Indemnities
20.1 Customer indemnity
Customer will defend PROOF and its Affiliates against a third-party claim to the extent it alleges that:
(a) Customer Content or an Application infringes that third party’s intellectual-property, privacy or confidentiality rights;
(b) Customer’s product, service, instruction or use of the Services breaches law or causes damage; or
(c) Customer’s material breach of the AUP caused the claim,
and will pay damages, settlements and reasonable external legal costs finally awarded or agreed, subject to clauses 20.3 and 21.
The indemnity does not apply to the extent the claim was caused by PROOF’s unauthorised modification or use of Customer Content contrary to Customer’s instructions or the Contract.
20.2 PROOF IP indemnity
PROOF will defend Customer against a third-party claim that Customer’s authorised use of proprietary PROOF Technology in the United Kingdom infringes that third party’s UK patent, copyright or registered trade mark, and will pay damages, settlements and reasonable external legal costs finally awarded or agreed.
This indemnity does not apply to a claim caused by:
(a) Customer Content, a Marketplace item, Network Infrastructure or third-party/open-source component;
(b) use outside the Contract or Documentation;
(c) modification not made or approved by PROOF;
(d) combination with an item not supplied or required by PROOF where the claim would otherwise have been avoided;
(e) use after PROOF offers a non-infringing replacement or instructs Customer to stop; or
(f) compliance with Customer’s design or instruction.
If a claim is likely, PROOF may procure continued use, modify or replace the affected item, or terminate it and refund prepaid Subscription Fees for the unused affected period. This clause states Customer’s sole contractual remedy for such an IP claim, except for rights that cannot lawfully be limited.
20.3 Indemnity procedure
An indemnified party must: (a) give prompt notice, with delay reducing liability only to the extent it causes material prejudice; (b) give the indemnifying party control of defence and settlement; and (c) provide reasonable cooperation at the indemnifying party’s cost. No settlement may admit fault by, impose non-monetary obligation on, or fail to release the indemnified party without its consent, not to be unreasonably withheld.
21. Liability
21.1 Non-excludable liability
Nothing in the Contract excludes or limits liability for:
(a) death or personal injury caused by negligence;
(b) fraud or fraudulent misrepresentation;
(c) breach of an implied term as to title where it cannot lawfully be limited;
(d) a liability that cannot lawfully be excluded or limited; or
(e) Customer’s obligation to pay valid Fees, taxes and amounts properly due.
21.2 Excluded losses
Subject to clause 21.1, neither party is liable under or in connection with the Contract, whether in contract, tort (including negligence), misrepresentation, restitution, statute or otherwise, for:
(a) indirect or consequential loss;
(b) loss of profit, revenue, business, contracts, anticipated savings, goodwill or reputation;
(c) loss arising from business interruption; or
(d) punitive or exemplary damages,
in each case whether the loss is direct or indirect to the extent permitted by law and whether or not foreseeable. This clause does not exclude reasonable direct costs of restoring data or responding to an incident where recoverable under the Contract; those costs remain subject to the applicable cap.
21.3 General cap
Subject to clauses 21.1, 21.4 and 21.5, each party’s total aggregate liability arising out of or in connection with the Contract in any rolling 12-month period will not exceed 100% of the Fees paid or payable by Customer under the affected Orders in that period.
21.4 Enhanced cap
Each party’s total aggregate liability in any rolling 12-month period for:
(a) breach of clause 15 (Confidentiality);
(b) breach of its obligations under clause 9 or the DPA; and
(c) amounts payable under clause 20 (Indemnities),
will not exceed 200% of the Fees paid or payable by Customer under the affected Orders in that period. For those claims, this enhanced cap replaces rather than adds to the general cap in clause 21.3. Subject to clause 21.1, total liability across all claims in the same period will not exceed the enhanced cap, and a loss may not be recovered twice.
21.5 Free Services
For claims arising solely from a Free Service and not connected with a paid Order, PROOF’s total aggregate liability is limited to £100, subject to clause 21.1.
21.6 Network and customer-controlled causes
Subject to clause 21.1, PROOF is not liable to the extent a loss is caused by:
(a) Network Infrastructure, a Network Participant or third-party service outside PROOF’s reasonable control;
(b) Customer Content, instruction, wallet, key, endpoint, configuration or security failure;
(c) Customer’s breach of the Contract or failure to follow a material warning;
(d) unsupported or modified software; or
(e) a public blockchain record or irreversible transaction that the Services executed in accordance with Customer’s verified instruction,
except to the extent PROOF’s own breach materially contributed to the loss.
21.7 Basis of bargain
The Fees and risk allocation reflect the limitations in this clause. Each party acknowledges it had the opportunity to obtain advice and insure risks beyond the agreed caps.
22. Compliance, sanctions and export controls
22.1 General compliance
Each party will comply with law applicable to its performance. Customer is responsible for laws applicable to its Application, Distributed Workloads, end users, content, industry and territories.
22.2 Sanctions
Customer represents that neither it, its Authorised Users nor, to its knowledge after reasonable enquiry, a person controlling it is a person with whom PROOF is prohibited from dealing under sanctions applicable to PROOF. Customer must not use the Services from, for the benefit of, or to facilitate dealings with a prohibited person or territory.
PROOF may conduct screening, require information, reject a payment or wallet, suspend access, block a transaction before acceptance, or retain funds/assets only to the extent required by law. PROOF is not required to make a refund or disclosure that would breach sanctions or a lawful direction.
22.3 Export controls
Customer must not use the Services to export, re-export, transfer or make available software, technology or services in breach of applicable export controls. Without PROOF’s prior written approval, Customer must not deploy a workload involving weapons, military/intelligence end use, nuclear systems, missile technology, chemical/biological agents, unlawful surveillance or other controlled dual-use activity. Customer must not rely on Standard Service nodes for a geographic export restriction.
22.4 Anti-bribery
Each party will comply with applicable anti-bribery law and will not offer or accept an improper financial or other advantage in connection with the Contract.
23. Changes to Contract documents
23.1 Operational and legal changes
PROOF may update these Terms or a Policy where reasonably necessary for law, security, abuse prevention, Network change, product development or clarity. PROOF will publish the new version and notify Workspace administrators of a material change.
23.2 Notice and effect
Except for an urgent change required by law, security or a Network event, a material change takes effect at least 30 days after notice. An urgent change may take effect sooner, with notice as soon as reasonably practicable.
If a non-urgent change materially disadvantages Customer, Customer may terminate the affected self-service Order before the change takes effect. PROOF will refund prepaid Subscription Fees for the unused period and refundable Service Credits. Continued use after the effective date constitutes acceptance where Customer received reasonable notice.
23.3 Price changes
A change to recurring Subscription Fees takes effect no earlier than the next renewal following at least 30 days’ notice, unless the Order states a longer period. Variable Network Costs and usage rates may change as described in clause 12.2.
24. Publicity and communications
24.1 Service communications
PROOF may send administrative, billing, security and legal communications necessary for the Services. Customer must keep administrator and billing contacts current and may not opt out of essential service notices while an Order is active.
24.2 Marketing
Marketing communications are subject to Customer’s preferences and applicable law. Unsubscribing from marketing does not stop essential service communications.
24.3 Public statements
Neither party may issue a press release naming the other without prior consent, except as required by law. PROOF may not list Customer as a customer without consent.
25. General
25.1 Force majeure
Neither party is liable for delay or failure caused by an event beyond its reasonable control, including widespread internet or cloud outage, Network halt or fork, cyberattack not caused by failure to use reasonable security, labour dispute, utility failure, natural disaster, epidemic, war, terrorism, civil disorder, government action or sanctions change. Payment obligations for Services already supplied are not excused. The affected party must take reasonable steps to mitigate and notify the other. If a material paid Service is unavailable due to force majeure for more than 60 consecutive days, either party may terminate it, with refunds handled as for discontinuation.
25.2 Assignment
Neither party may assign the Contract without the other’s prior written consent, not to be unreasonably withheld, except that either party may assign it on notice to an Affiliate or in connection with a bona fide merger, reorganisation or sale of substantially all relevant business/assets, provided the assignee is not a direct competitor of the other and can perform the obligations. Customer may not assign to a sanctioned or legally prohibited person. An invalid assignment is void.
25.3 Subcontracting
PROOF may use subcontractors to perform the Services and remains responsible for their performance to the extent required by the Contract. Subprocessors of Personal Data are governed by the DPA. This clause does not make a Network Participant a PROOF subcontractor: Distributed Workload Data is transmitted at Customer’s direction and Customer is its Controller under clause 7.
25.4 Notices
A legal notice under the Contract must be in writing and sent by email to the legal contact in the Order (for Customer) or to legal@proof.computer (for PROOF), with “Legal Notice” in the subject, and for termination for cause or a claim also by tracked post or recognised courier to the registered/geographic address in the Order or Website. Email is received on the next Business Day after transmission unless a delivery failure is received. This does not apply to service-status, billing or routine support notices.
25.5 Entire agreement
The Contract is the entire agreement about its subject and supersedes prior proposals, statements and understandings. Each party acknowledges it does not rely on a statement not set out in the Contract, but nothing excludes fraud or fraudulent misrepresentation. Published roadmaps and sales forecasts are non-binding unless expressly incorporated in an Order.
25.6 No waiver
A failure or delay to exercise a right is not a waiver. A waiver must be in writing and applies only to the stated instance.
25.7 Severance
If a provision is illegal or unenforceable, it will be modified to the minimum extent necessary to make it enforceable while preserving intent, or severed if modification is not possible. The rest remains effective.
25.8 No partnership or agency
The parties are independent contractors. Neither may bind the other or represent that it has authority to do so. The Contract does not create partnership, agency, fiduciary duty, employment or joint venture.
25.9 Third-party rights
Except for a party’s Affiliates and indemnified persons where expressly stated, a person who is not a party has no right under the Contracts (Rights of Third Parties) Act 1999 to enforce the Contract. The parties may vary or terminate the Contract without third-party consent.
25.10 Order of interpretation
“Including” means “including without limitation”. Headings do not affect interpretation. A reference to law includes amendments and replacements. Writing includes email where the Contract permits. A singular includes the plural and vice versa.
25.11 Counterparts and electronic signature
An Order may be signed in counterparts and electronically. Click acceptance, typed signature and recognised e-signature may evidence agreement.
25.12 Governing law and courts
The Contract and any non-contractual obligation arising from it are governed by the law of England and Wales. The courts of England and Wales have exclusive jurisdiction, except that either party may seek urgent injunctive relief in any competent court and PROOF may pursue undisputed debt in a court with jurisdiction over Customer.
26. Contacts
General and legal/e-commerce contact: hello@proof.computer. Legal notices: legal@proof.computer. Security reports: security@proof.computer. Privacy and data-protection requests: privacy@proof.computer. Support: support@proof.computer. Abuse reports: abuse@proof.computer.
MOOSE LABS LTD trading as PROOF · Version 1.0 · effective 1 September 2026 · previous versions are archived by PROOF and available on request from legal@proof.computer.