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Terms and Conditions

Last updated: 15th of October 2026


Part 0 — General Terms

0.1 About the Minibits Project and the Operator

Minibits ("Minibits" or "the project") is a non-commercial, open-source research project into peer-to-peer electronic cash systems based on Bitcoin and the Cashu ecash protocol. The project develops and publishes:

and operates the following supporting services: the Minibits LNURL/NOSTR server ("LNURL server"), the Minibits Mint ("Mint"), the Minibits Recovery Tool ("Recovery Tool") and the hosted Minibits Ippon instance ("Hosted Ippon"), together the "services".

All services covered by these Terms are operated by Bitango Technologies, s.r.o., Bratislava, Slovak Republic, ID No. 51 299 631, registered in the Slovak Republic (the "Operator"), with the voluntary contributions of developers participating in the project ("Contributors").

Operator operates the services on the non-commercial basis and subject to these Terms.

The Mint, the Recovery Tool and the Hosted Ippon are experimental and optional: none of them is necessary for the Wallet to function. The Wallet can be used with any compatible third-party mint.

0.2 Scope of These Terms

These Terms and Conditions ("Terms") govern access to and use of all software, services and APIs operated under the minibits.cash domain and related infrastructure. The Terms are organised into the following parts:

Where a specific section conflicts with Part 0, the sub-project section prevails, except for Sections 0.5, 0.7 and 0.8, which prevail over any other provision.

0.3 Acceptance

By downloading, installing, accessing, or otherwise using any Minibits service, you ("you") agree to be bound by these Terms and by our Privacy Policy, available at https://minibits.cash/privacy. If you do not agree, you must discontinue use immediately.

0.4 Nature of the Services

IMPORTANT — PLEASE READ

Minibits Wallet and all related services are experimental research software. They implement immature cryptographic protocols that have not received comprehensive security review. Software may contain known and unknown bugs.

The services are made available solely to advance research into peer-to-peer electronic cash systems. The Operator makes no representation that any service is fit for any purpose beyond research, development and experimentation with small amounts.

No Minibits service is offered, marketed or intended as a payment product, an investment product, a savings product, or a means of safekeeping funds or crypto-assets for third parties.

0.5 Non-Commercial Basis; Donations

All Minibits services are provided free of charge, on a non-commercial basis and without intention of making a profit, and are not provided as an occupation or business. In particular:

The project welcomes voluntary donations in support of open-source development. Donations are unconditional gifts: they are not a fee or consideration for any service or feature, they confer no entitlement, priority, service level or contractual claim of any kind, and no service or feature is conditioned on making one.

0.6 Eligibility and Jurisdictions

You must be at least 18 years of age (or the age of legal majority in your jurisdiction, whichever is higher) to use any Minibits service. By using the services you represent and warrant that you meet this requirement.

The services are not directed at, and must not be used by, persons located in jurisdictions where the receipt or use of Bitcoin, ecash, or related services is prohibited or restricted by applicable law. It is your sole responsibility to determine whether your use of these services is lawful in your jurisdiction.

The Operator may restrict, condition or refuse access to any service, in whole or in part, for users in particular jurisdictions where it considers this necessary or prudent in light of applicable law or regulation.

0.7 Regulatory Status

(a) Non-custodial wallet software. The Wallet is non-custodial software. It stores ecash, private keys and seed phrases exclusively on your device. The Operator does not hold, safekeep or control the ecash or keys stored in your Wallet or the means of access to them, and operates no system of user accounts or balances. You hold your ecash yourself, at your sole risk and initiative. Publishing open-source software does not constitute the provision of any service to you.

(b) Non-commercial experimental services. The supporting services described in Parts 1 to 3 are provided free of charge, without profit intent, under strict published limits (Section 0.8), for research, protocol development and interoperability testing. The Operator does not provide, as an occupation or business, any service consisting of custody and administration of crypto-assets, exchange of crypto-assets, execution or transmission of orders, advice, portfolio management, or transfer of crypto-assets on behalf of clients.

(c) No offer of crypto-assets. Nothing in these Terms, on any Minibits website or in the operation of any Minibits service constitutes an offer of crypto-assets to the public, an admission or intended admission of any instrument to trading, or a solicitation to purchase crypto-assets. Ecash is a technical bearer record of the Cashu protocol created only upon your own request and against your own payment, as further described in Section 2.8.

(d) Bitcoin only. Any mint operated within the Minibits project issues ecash denominated exclusively in satoshis (a unit of Bitcoin) and redeems ecash exclusively in Bitcoin, over the Lightning Network or on the Bitcoin blockchain. No mint operated within the project issues ecash denominated in or referencing any official currency, and none offers redemption in, or exchange into, any official currency. Fiat amounts that the Wallet may display are indicative conversions for your convenience only.

(e) No advice. Nothing in these Terms or on any Minibits website constitutes financial, investment, legal or tax advice. You are solely responsible for your own decisions and for complying with all tax and reporting obligations that apply to you.

0.8 Limits and Experimental Scale

To keep the services at an experimental, non-commercial scale, the Operator maintains strict limits, including:

Current limits are published at the respective service's /v1/info endpoint. The Mint's reserves and outstanding ecash are published at https://minibits.cash#watchdog. The Operator may change these limits at any time. Where a limit would be exceeded, the Operator may refuse or pause new minting or deposits, refuse any request, and return any corresponding payment where this is technically possible. Redemption of outstanding ecash is not restricted by the aggregate ceiling.

0.9 Disclaimers and Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW:

ALL SERVICES ARE PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, OR NON-INFRINGEMENT.

THE OPERATOR DOES NOT WARRANT THAT THE SERVICES WILL BE UNINTERRUPTED, ERROR-FREE, OR FREE FROM SECURITY VULNERABILITIES.

THE OPERATOR SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES ARISING FROM YOUR USE OF OR INABILITY TO USE THE SERVICES, INCLUDING LOSS OF ECASH, BITCOIN, OR OTHER DIGITAL ASSETS, HOWEVER CAUSED.

YOU BEAR SOLE RESPONSIBILITY FOR SECURING ACCESS TO YOUR WALLET, PRIVATE KEYS, SEED PHRASES, AND ANY FUNDS HELD THEREIN.

Indemnity. You agree to indemnify and hold harmless the Operator and its members, statutory bodies, officers, employees, volunteers and Contributors from and against any claims, liabilities, damages, fines, penalties, costs and expenses (including reasonable legal fees) arising out of or relating to (i) your use of any service in violation of these Terms or of applicable law, (ii) your use of any service to provide services to third parties, with or without any required authorisation, or (iii) content or instructions you submit to any service.

Claims against the Operator only. To the maximum extent permitted by applicable law, any claim, demand or proceeding arising out of or relating to these Terms or the services shall be brought solely against the Operator and not against any member, statutory body, officer, employee, volunteer or Contributor in their personal capacity. Each such person may rely on this provision.

Nothing in these Terms limits liability that cannot lawfully be excluded or limited under applicable law (including liability for fraud, for intentional damage, or for death or personal injury caused by negligence), nor any mandatory rights you have as a consumer.

0.10 Open-Source Software

Minibits Wallet, the Recovery Tool and Minibits Ippon are released as open-source software under the MIT Licence. Source code is available at https://github.com/minibits-cash. Third-party libraries used by the software are subject to their respective licences.

Third parties may independently deploy modified or unmodified versions of the software. The Operator is not a party to, and accepts no responsibility for, any such deployment. Anyone who deploys the software to provide services to others does so on their own behalf and is solely responsible for complying with all laws applicable to that deployment.

0.11 Changes to Services and Terms; Regulatory Changes

The Operator may modify, suspend, or discontinue any service or feature at any time, with or without notice, and without liability. Where practicable, reasonable advance notice of material discontinuations will be given through the minibits.cash website or the app itself.

If the Operator determines, acting reasonably, that the operation, characterisation or regulation of any service has changed or is likely to change — including in light of legislation, regulatory guidance, or any communication or decision of a competent authority — it may modify, restrict (including by jurisdiction or category of user), suspend or discontinue that service, in whole or in part, without liability. Before discontinuing the Mint, the Operator will, where reasonably practicable, publish notice on minibits.cash and provide a redemption window during which outstanding ecash may be redeemed in Bitcoin.

The Operator may update these Terms at any time. Continued use of any service after updated Terms are posted constitutes acceptance of the revised Terms. The "Last updated" date above will be updated when changes are made, and previous versions are archived and available on request.

0.12 Privacy

The collection and use of personal data is governed by the Privacy Policy at https://minibits.cash/privacy, which is incorporated into these Terms by reference.

0.13 Governing Law and Disputes

These Terms are governed by the laws of the Slovak Republic, without regard to its conflict-of-laws rules. Any dispute arising from or relating to these Terms or the services shall be submitted to the exclusive jurisdiction of the competent courts of Bratislava, Slovak Republic, subject to any mandatory consumer-protection rights you may have under applicable law.

0.14 Severability

If any provision of these Terms is held invalid, illegal or unenforceable, that provision shall be enforced to the maximum extent permissible and the remaining provisions shall continue in full force and effect. The invalid provision shall be deemed replaced by a valid provision that most closely reflects its purpose.

0.15 Contact

For any questions regarding these Terms, please contact us at:

Email: support@minibits.cash Website: https://minibits.cash


Part 1 — Minibits Wallet

1.1 Description

Minibits Wallet is an open-source mobile application for Android and iOS that implements ecash wallets backed by Bitcoin via the Cashu protocol and the Lightning Network. The associated public LNURL server provides Lightning address and NOSTR-based identity services under the minibits.cash domain (e.g. yourname@minibits.cash).

The Wallet is in beta. It is provided as a tool to explore how Bitcoin-backed ecash can enable instant, low-cost, and private value transfer.

1.2 Beta Software Disclaimer

BETA SOFTWARE — IMPORTANT RISK NOTICE

The Wallet is beta software with incomplete functionality and both known and unknown bugs. The Cashu protocol implemented by the Wallet has not yet received extensive security review or testing and is under heavy development. Use only with ecash amounts you can afford to lose entirely.

1.3 Ecash and Mint Trust Model

The Wallet is software only. All ecash is issued by the mint you choose to use, and every claim embodied in ecash exists solely against the mint that issued it. Installing or using the Wallet creates no claim of any kind against the Operator. The Wallet may come preconfigured with the Minibits Mint; you may add, remove or switch to any compatible mint at any time.

By using a mint you accept that:

1.4 LNURL Server and Wallet Addresses

As a part of the Wallet infrastructure, the Operator runs a public LNURL/NOSTR server that enables wallet addresses (e.g. yourname@minibits.cash) to function as Lightning addresses and NOSTR NIP-05 public identifiers.

How payments to your wallet address work.
The LNURL server is a technical directory and message-routing service. It resolves wallet addresses into payment requests of the Minibits Mint and relays the related protocol messages to your Wallet. Ecash resulting from a payment to your wallet address is cryptographically locked to your wallet's public key: the LNURL server cannot spend it, does not execute transfers on your behalf, and maintains no balances."

By using this feature you acknowledge:

1.5 Backup and Recovery

The Wallet provides backup and recovery mechanisms including a 12-word mnemonic seed phrase, and wallet export functionality. You are solely responsible for:

The Operator cannot recover lost ecash, seed phrases, or wallet data on your behalf.

1.6 Nostr Wallet Connect (NWC)

The Wallet supports Nostr Wallet Connect (NWC), which allows third-party applications to initiate payments from your Wallet. You are solely responsible for the NWC connections you authorise and for any payments initiated through them.

1.7 NFC Features

The Wallet supports NFC-based token transfer (including Android HCE). NFC features operate at close range and are subject to device hardware limitations. The Operator is not responsible for failed NFC transactions.

1.8 Over-the-Air (OTA) Updates

The Wallet may receive optional OTA software updates. OTA updates are opt-in, except for critical security-related updates. Keeping the Wallet updated is strongly recommended in order to benefit from bug fixes and security improvements.

1.9 Acceptable Use

You agree not to use the Wallet, the LNURL server or the Mint:

Failing to adhere to this Acceptable Use policy may lead to your Wallet being blocked from accessing the LNURL server temporarily or permanently, or to the removal of your wallet address record from the LNURL server.


Part 2 — Minibits Mint & Minibits Recovery Tool

2.1 Description

The Operator runs, on a non-commercial and best-efforts basis, an experimental Cashu mint at mint.minibits.cash ("Mint"). The only supported ecash unit is SAT ("satoshi"). The Mint is operated for research into Chaumian ecash, to test interoperability with other Cashu protocol implementations, and to develop and test the Minibits Wallet and Minibits Ippon. It is subject to the limits described in Section 0.8.

The Minibits Recovery Tool is a companion web application that assists in recovering ecash issued by the Mint in situations where the Wallet is unable to do so automatically.

2.2 Experimental Service — Critical Limitations

MINT — CRITICAL LIMITATIONS

The Mint is an experimental, non-commercial service. Mint reserves are held by the Operator's Bitcoin Lightning node and associated on-chain wallet. There is no guarantee whatsoever that the node will not fail or lose its reserves as a result of technical failure, operational error, theft or force majeure.

DO NOT hold ecash issued by the Mint that you cannot afford to lose entirely. The Mint is not a savings product and is not intended for storing value over the longer term.

Access to the Mint is open to any Cashu-compatible wallet, subject to the limits published at the Mint's /v1/info endpoint and to Section 0.8.

2.3 No Uptime Guarantee

The Operator makes no commitment regarding availability, uptime, or the duration for which the Mint will remain operational. The Mint may be taken offline temporarily or discontinued, subject to Sections 0.11 and 2.5.

2.4 Mint Keyset Rotation

The Mint issues ecash using cryptographic keysets. In accordance with the Cashu protocol, the Mint may rotate its active keyset — that is, retire an existing keyset and introduce a new one — for operational or security reasons. Keyset rotations are expected to occur periodically, typically no more than once per calendar year under normal operating conditions, but may occur at any time and without prior notice if a security concern requires it.

Upon a keyset rotation:

The Operator will endeavour to announce scheduled keyset rotations in advance through the project's website and social network profiles. The current active keyset and any retired keysets still within their transitional period are always queryable via the Mint's keys endpoint.

2.5 Risk of Ecash Loss

By using the Mint, you explicitly acknowledge and accept that:

2.6 Recovery Tool

The Minibits Recovery Tool is provided as an experimental utility to assist in recovering ecash issued by the Mint. The Recovery Tool:

2.7 Third-Party Mints

The Minibits Wallet may be used with any compatible third-party Cashu mint. These Terms do not govern third-party mints. The Operator has no control over, and accepts no responsibility for, any third-party mint.

2.8 Nature of Ecash Issued by the Mint

Ecash issued by the Mint is a cryptographic bearer record created by the Cashu protocol solely upon your own request and against your own payment in Bitcoin, evidencing a claim for redemption of the corresponding amount of Bitcoin against the Mint. It confers no rights other than that redemption claim, bears no interest or return of any kind, is not offered or promoted as an investment, and is not admitted, and will not be sought to be admitted, to trading on any trading platform. Section 0.7(d) applies.


Part 3 — Minibits Ippon

3.1 Description

Minibits Ippon ("Ippon") is an experimental, open-source ecash and Lightning wallet implementation developed within the Minibits project. It is designed primarily for non-human systems — in particular AI agents and automated processes — that require programmatic access to micropayment capabilities. Ippon is available as:

Ippon is released as open-source software under the MIT Licence.

3.2 Alpha Software Disclaimer

ALPHA SOFTWARE — CRITICAL RISK NOTICE

Ippon is alpha-stage software. It may contain serious bugs, security vulnerabilities, and incomplete features. Production use of Ippon requires a self-hosted instance deployed under your own control. Use the Hosted Ippon exclusively for evaluation, development and testing, with small amounts only. Do not hold funds you cannot afford to lose. The Hosted Ippon may be reset, reconfigured, or discontinued at any time.

3.3 Intended Users

Ippon is intended for:

Ippon operating models are:

Ippon is not intended for general consumer use. By using the Hosted Ippon or deploying your own instance, you represent that you fall within one of the above categories and that you understand the alpha-stage nature of the software.

3.4 Security

Ippon is an ecash wallet that holds ecash in its own database. Wallet access is controlled by a bearer access_key issued at wallet creation time. You are responsible for:

The MCP server component (minibits_ippon_mcp) manages access_keys on behalf of agents and links them to session identifiers to reduce the risk of key exposure. However, the operator of the MCP server instance remains responsible for securing the underlying infrastructure.

3.5 Hosted Minibits Ippon Instance

The Hosted Ippon at ippon.minibits.cash, including its MCP server, is a capped developer preview operated by the Operator free of charge, solely for evaluation, development and interoperability testing. It must not be used in production, for commercial purposes, or to hold balances beyond the published limits, which are deliberately set at nominal amounts. Wallets on the Hosted Ippon are short-lived by design and should be emptied at the end of each session or project.

The Hosted Ippon enforces strict limits on wallet balances, payment amounts and wallet creation rates, and is subject to Section 0.8. Current limits are published via the GET /v1/info endpoint. The Operator may change these limits at any time without notice. The Operator makes no commitment regarding uptime, availability, or continuity of the Hosted Ippon, which may be reset or discontinued at any time; where practicable, notice will be given so that balances can be withdrawn.

3.6 Self-Hosted Deployments

If you deploy Minibits Ippon or the MCP server (or any modification of them), you do so exclusively on your own behalf and at your own risk. If you use such a deployment to provide services to third parties, you are solely responsible for compliance with all laws and regulations applicable to it, including any authorisation, licensing, anti-money-laundering or reporting requirement, and you must not represent that the Operator or any Contributor is the provider of, or a party to, your services.

3.7 MCP Server (minibits_ippon_mcp)

The MCP server is a companion open-source project that provides a Model Context Protocol interface over the Ippon REST API. It is intended to simplify integration of Ippon wallets into AI agent frameworks. The MCP server:

3.8 Acceptable Use

You agree not to deploy or use the Hosted Ippon or the MCP server:


Entire Agreement

These Terms, together with the Privacy Policy at https://minibits.cash/privacy, constitute the entire agreement between you and the Operator in relation to the Minibits software and services and supersede all prior representations, agreements, or understandings.


Operated by Bitango Technologies, s.r.o., Bratislava, Slovak Republic (ID No. 51 299 631) © 2026 Minibits contributors. Software released under the MIT Licence.