Terms and Conditions

Last updated: 30th of June 2026

Part 0 — General Terms

0.1 About Minibits Project

Bitango Technologies, a private limited company, develops and operates the Minibits Wallet ("Wallet"), an open-source mobile Bitcoin Lightning and ecash wallet, implementing the Cashu protocol. Bitango Technologies also develops the Minibits Ippon wallet ("Ippon"), an ecash and Lightning wallet designed primarily for non-human systems — in particular for AI agents and other automated processes.

All other related Minibits services covered under these Terms (Minibits Test Mint, Minibits Recovery Tool and Minibits Ippon hosted instance) are experimental and intended only for research, development and testing. They are operated by physical persons working voluntarily on the Minibits project ("Development team"), and thus not by Bitango Technologies. Those services are optional and not necessary for the Wallet to function properly.

0.2 Scope of These Terms

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

Part 0 — General terms applicable to all sub-projects
Part 1 — Minibits Wallet
Part 2 — Minibits Test Mint and Recovery Tool
Part 3 — Minibits Ippon

Where a specific section conflicts with Part 0, the sub-project section prevails.

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. Bitango Technologies and the Development team make no representation that any service is fit for any purpose beyond research and development.

0.5 Eligibility

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.

0.6 No Financial Services

Bitango Technologies is not a financial service provider. Nothing in these Terms or on any Minibits website constitutes financial advice, investment advice, or a solicitation to engage in any financial transaction.

Bitango Technologies does not operate any centralized system of user accounts with balances. Ecash notes are solely self-hosted in your wallet's device storage at your own risk and initiative. You are responsible for complying with all tax and reporting obligations arising from your use.

0.7 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.

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

BITANGO TECHNOLOGIES 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.

Nothing in these Terms limits liability that cannot lawfully be excluded under applicable law (including liability for fraud or death or personal injury caused by negligence).

0.8 Open-Source Software

Minibits Wallet, Recovery tool and Minibits Ippon are released as open-source 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.

The open-source nature of the software means that third parties may independently deploy modified or unmodified versions of the software. Bitango Technologies accepts no responsibility for any such deployments.

0.9 Changes to Services and Terms

Bitango Technologies and the Development team reserve the right to modify, suspend, or discontinue any service or feature at any time, with or without notice, and without liability. Where practicable, we will provide reasonable advance notice of material discontinuations through the minibits.cash website or the app itself.

We may update these Terms at any time. Continued use of any service after updated Terms are posted constitutes acceptance of the revised Terms. We will update the "Last updated" date above when changes are made.

0.10 Privacy

Our 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.

0.11 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.

0.12 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 routing 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

Ecash notes held in the Wallet are issued by a Cashu mint of your choosing. By using a mint you accept that:

The mint issues ecash in cryptographically blinded form; it is transformed to usable notes only on your device. The mint thus does not know or track per-user accounts or balances.
To redeem, receive or transfer your ecash you trust the mint that has issued it.
The Wallet allows you to connect to any compatible third-party mint. Bitango Technologies is not responsible for any third-party mint's operations, reserves, availability, or conduct.
Ecash notes are bearer instruments. Anyone who obtains your ecash notes can spend them. Theft of notes is irreversible.
Loss of notes can be recovered only through the seed phrase. It is the user's sole responsibility to make a proper seed phrase backup and refresh it on each wallet reinstall or factory reset.

1.4 LNURL Server and Wallet Addresses

As a part of the Wallet infrastructure, Bitango Technologies operates 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. By using this feature you acknowledge:

The LNURL server is provided on a best-efforts basis with no uptime guarantee.
The server may be discontinued at any time. Bitango Technologies will endeavour to provide reasonable notice through the minibits.cash website where practicable, but no advance-notice period is guaranteed.
If the server is discontinued, your @minibits.cash address will cease to route payments. This will not affect ecash already stored on-device. This will not affect other means of ecash transfers.
Custom wallet names are offered in exchange for a voluntary donation. Payment of a donation does not create any contractual entitlement to continued service.
The LNURL server associates wallet addresses other anonymous identifiers, such as public keys. Please refer to the Privacy Policy for details of what information is processed.

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:

Creating and securely storing backups of your seed phrase and wallet data.
Protecting your device, seed phrase, and wallet export files from unauthorised access.
Recovering your wallet in the event of device loss, damage, or failure.

Bitango Technologies 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. Bitango Technologies 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. Bitango Technologies strongly recommends keeping the Wallet updated to benefit from bug fixes and security improvements.

1.9 Acceptable Use

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

For any purpose that is unlawful under applicable law, including money laundering, terrorist financing, or the circumvention of sanctions.
To process transactions on behalf of third parties in a manner that would require regulatory authorisation that you do not hold.
To interfere with, disrupt, inspect, attack, misuse or overload Minibits LNURL server.
In any way that could expose Minibits Wallet or LNURL server to legal liability.

Failing to adhere to the 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 Test Mint & Minibits Recovery Tool

2.1 Description

The Development team operates voluntarily and on a best-efforts basis an experimental Cashu mint ("Test Mint"). The only supported ecash unit is SAT ("satoshi"). The Test Mint deployment is solely intended to be used to test interoperability with other Cashu protocol implementations, for research purposes, and to develop and test the Minibits Wallet.

The Minibits Recovery Tool is a companion web application that assists developers, researchers and testers in recovering ecash tokens from the Test Mint in situations where the Wallet is unable to do so automatically.

2.2 Strictly for Development and Testing

TEST MINT — CRITICAL LIMITATIONS

The Test Mint is operated exclusively for research, development and testing purposes. Mint reserves are held by the Bitcoin Lightning node. There is no guarantee whatsoever that Bitcoin Lightning node will not fail or lose its reserves as a result of technical failure, operational error, theft or force majeure.

DO NOT store funds in the Test Mint that you cannot afford to lose entirely.

Access to the Test Mint is open to any Cashu-compatible wallet for research, development and testing purposes only. The Test Mint imposes strict limits on transaction amounts, published at the mint's /v1/info endpoint.

2.3 No Uptime Guarantee

The Test Mint is operated voluntarily, on a best-efforts basis, by physical persons participating in the Minibits Development team. Those persons make no commitment regarding availability, uptime, or the duration for which the mint will remain operational. The Test Mint may be taken offline, reset, or permanently discontinued at any time without prior notice.

In the event of a planned shutdown, the team will endeavour to announce this through the minibits.cash website or on social networks, but provides no guarantee of advance notice.

2.4 Mint Keyset Rotation

The Test 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:

Ecash tokens issued under the previous ("retired") keyset remain valid for redemption and swap for a transitional period of twelve (12) months from the date of rotation.
During that transitional period, the mint will continue to honour swap requests that exchange retired-keyset ecash for freshly issued ecash under the current active keyset. Wallets that support keyset rotation — including the Minibits Wallet — will perform this swap automatically, while the user actively uses the wallet.
If you use a wallet only occasionally or one that does not handle keyset rotation automatically, you are responsible for manually swapping any retired-keyset ecash before the transitional period expires.
After the twelve-month transitional period, the retired keyset may be removed from the mint's database at any time and without further notice. Ecash tokens that have not been swapped before removal will no longer be honoured by the Test Mint. The Development team bears no liability for ecash lost because it was not swapped within the transitional period.

The Development team will endeavour to announce scheduled keyset rotations in advance through their social network profile. 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 Test Mint, you explicitly acknowledge and accept that:

Ecash issued by the Test Mint may become unspendable if the mint is taken offline, attacked or experiences a technical failure.
The Cashu protocol is experimental. Implementation bugs may result in ecash that cannot be spent or redeemed.
The Development team will make reasonable efforts to provide a redemption window before discontinuing the mint, but cannot guarantee this in all circumstances (e.g. in the event of a security incident).
The Development team does not guarantee the solvency of the Bitcoin reserve backing ecash issued by the Test Mint in the event of force majeure, successful attack or unrecoverable technical failure.

2.6 Recovery Tool

The Minibits Recovery Tool is provided as a development and test utility to assist in recovering ecash from the Test Mint. The Recovery Tool:

Is experimental software and may not succeed in all recovery scenarios.
Supports Test Mint recovery only; use the in-app seed phrase recovery tool to recover from other third-party mints.
Requires you to provide your wallet seed phrase, which never leaves your browser. You are solely responsible for the security of the device and browser from which you access the Recovery Tool.
Is provided without warranty. Development team is not liable for failed recovery attempts or for any loss of ecash that the Recovery Tool is unable to recover.

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. Bitango Technologies and the Development team have no control over, and accept no responsibility for, any third-party mint.

Part 3 — Minibits Ippon

3.1 Description

Minibits Ippon ("Ippon") is an experimental, open-source ecash and Lightning wallet implementation developed by Bitango Technologies. 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:

A wallet server providing REST API;
An MCP (Model Context Protocol) server facade, provided by the companion minibits_ippon_mcp project, which wraps the Ippon API for AI agent integration;
A local CLI tool for agent-controlled deployments.

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. Instruct your agents to use your self-hosted instance for any production project. Use the hosted instance exclusively for development and testing purposes. It may contain serious bugs, security vulnerabilities, and incomplete features. Use it at your own risk, with small amounts only. Do not store funds you cannot afford to lose. The hosted instance at ippon.minibits.cash may be reset, reconfigured, or discontinued at any time without notice.

3.3 Intended Users

Ippon is intended for:

Developers and researchers evaluating ecash payment capabilities for AI agent or automated workflows.
Cashu mint operators exploring complementary wallet-as-a-service tooling.
AI agents or automated systems acting on behalf of and under the control of a responsible developer or operator.

Ippon operating models are:

Hosted deployment accessed by AI agents or by any automated process over the network through the REST API
Hosted deployment accessed by AI agents using the dedicated MCP server
Local installation by the AI agent that is accessed privately using local CLI commands

Ippon is not intended for general consumer use. By using the hosted instance 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. Bitango Technologies provides the open-source software on an "as is" basis and accepts no liability for any hosted deployments.

3.4 Security

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

Securing the access_key associated with each wallet. Any party who obtains the access_key can access and drain the wallet.
Securing the database if you use self-hosted Ippon instance. Any party who obtains the access to that database can drain the wallet.
Emptying your wallets at the conclusion of each agentic session or project. Ippon wallets are designed to be short-lived and should not hold balances over the long term.

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

There is a hosted Minibits Ippon and MCP server instance running at ippon.minibits.cash that is operated by the Development team and serves for research, development and testing purposes only. The hosted instance enforces strict limits on wallet balances, payment amounts, and wallet creation rates. These limits are published via the GET /v1/info endpoint. The Development team reserves the right to change these limits at any time without notice. The hosted instance is operated by the Development team on a best-efforts basis. The Development team makes no commitment regarding uptime, availability, or continuity of service. The instance may be reset or discontinued at any time.

3.6 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:

Is alpha software and subject to the same disclaimers as Ippon itself.
Manages wallet access_keys server-side and links them to agent session identifiers, but does not provide cryptographic guarantees of access control.
May be self-hosted independently of the Ippon wallet server.

3.7 Acceptable Use

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

To process transactions for third parties in a manner that would require regulatory authorisation that you do not hold.
For any unlawful purpose.
To disrupt, attack, or degrade the Minibits infrastructure.

Entire Agreement

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