Last Updated: 12 December 2025
Version: 1.4
These Terms of Service ("Terms") constitute a legally binding agreement between Tastenkunst GmbH ("Tastenkunst," "we," "us," or "our"), a company registered in the Commercial Register of the District Court of Leipzig under HRB 24784, Managing Director: Marcel Baumberg, and the user ("User" or "you") regarding your use of the Eternl software.
The "Software" or "Services" includes the website (e.g., eternl.io), browser extensions, mobile applications (iOS/Android), desktop applications, and any associated APIs provided by Tastenkunst.
BY DOWNLOADING, INSTALLING, OR USING THE SOFTWARE, YOU ACKNOWLEDGE THAT YOU HAVE READ, UNDERSTOOD, AND AGREE TO BE BOUND BY THESE TERMS. IF YOU DO NOT AGREE, YOU MUST IMMEDIATELY STOP USING THE SOFTWARE.
IMPORTANT NOTICE: ETERNL IS A NON-CUSTODIAL (SELF-CUSTODY) SOFTWARE. WE DO NOT HAVE ACCESS TO YOUR PRIVATE KEYS, RECOVERY PHRASES, OR FUNDS. WE CANNOT RECOVER YOUR FUNDS IF YOU LOSE YOUR CREDENTIALS.
Eternl is a non-custodial interface that allows you to interact directly with the Cardano blockchain. You retain full control and responsibility for your private keys, seed phrases, and hardware wallets.
Tastenkunst is not a Virtual Asset Service Provider (VASP), a bank, an exchange, or a custodian. We do not store, send, or receive assets on your behalf. We provide the software tool; you perform the actions.
The Software currently supports Cardano (ADA) and Cardano-native assets. Sending unsupported assets (e.g., Bitcoin, Ethereum) to an Eternl address may result in the permanent loss of those assets.
To the extent required by statutory law (including § 327f BGB), we will provide security and maintenance updates necessary to keep the Software in conformity with the contract ("Necessary Updates"). You are responsible for installing these updates promptly. Beyond these statutory obligations, Tastenkunst has no contractual duty to provide specific feature enhancements, functional expansions, or ongoing development of the Software.
Tastenkunst has no obligation to provide technical support, customer service, or maintenance for the Software. Any support we choose to provide is given on a voluntary, "as-is," and "best effort" basis and may be discontinued at any time.
You must be at least 18 years old and have the full capacity to enter into this agreement.
You may not use the Software if you are located in, or a citizen/resident of, any state, country, or region that is subject to sanctions by the United Nations, the European Union, the United States (OFAC), or Germany. Furthermore, you represent and warrant that:
You do not need to create an account or provide personal data (KYC) to use the Software.
The Eternl wallet software itself is currently provided free of charge. Where no paid digital service is purchased, no statutory right of withdrawal is triggered by the mere download and use of the Software. Mandatory consumer rights remain unaffected.
If you are a consumer in the European Union and you purchase a paid digital service from Tastenkunst (for example, an in-app purchase or subscription), you generally have a statutory right to withdraw from that paid contract within 14 days, starting on the day the contract is concluded, unless an exception applies.
For digital content or digital services, you may lose your right of withdrawal once performance begins. Therefore, where applicable, before we start providing a paid digital service during the withdrawal period, we will request that you:
If you do not provide (a) and (b), we will not start providing the paid digital service during the withdrawal period unless and until we can do so in a legally compliant manner.
If you have a right of withdrawal and want to exercise it, you can contact us at info@tastenkunst.io with a clear statement of your decision to withdraw. We may request information necessary to identify the relevant purchase (e.g., transaction/receipt ID).
You are solely responsible for the confidentiality and security of your private keys, seed phrases (12-24 words), and passwords. Tastenkunst stores no backup of these credentials.
If you lose your seed phrase or private key, you will lose access to your funds. Tastenkunst cannot recover them for you.
You are responsible for the security of the device (computer, phone) on which the Software is installed, including keeping the OS updated and free of malware.
All transactions on the Cardano blockchain require the payment of network fees ("Gas") to validators. These fees are not paid to Tastenkunst and are beyond our control.
Tastenkunst may charge a fee for specific interactions facilitated by the Software interface, such as Swaps (DEX Aggregation), NFT transactions, or other DApp or blockchain interactions. These fees are disclosed to you in the transaction summary prior to signing. By signing the transaction, you consent to the deduction of this fee. Unless otherwise stated, fees displayed are inclusive of applicable Value Added Tax (VAT) where required by law.
When using third-party aggregators or on-ramp providers, those third parties may charge their own fees, which are separate from Tastenkunst fees.
You acknowledge that transactions on the Cardano blockchain are irreversible. Once a transaction is signed and broadcast, Tastenkunst cannot reverse it or recover funds. Consequently, network fees and service fees paid for attempted or completed transactions are non-refundable, except where required by statutory consumer protection law.
The “MonsterSwap” feature provides an interface to third-party decentralised exchange (DEX) aggregators. MonsterSwap is a UI + backend (relay) feature:
Swap Quotes; Slippage; No Best-Rate Guarantee: Any swap quote, output estimate, route, or fee information displayed in the Software is an estimate only and may change before execution due to market volatility, liquidity, slippage, network conditions, mempool congestion, or third-party service behavior.
Swap transactions may fail, be delayed, or execute at a different effective price than estimated. You are solely responsible for reviewing and verifying all transaction details (including recipient address, amounts, fees, slippage tolerance, and route) before signing and submitting a transaction.
Multi-Provider Selection (Informational Only): Where the Software displays quotes from multiple third-party providers/aggregators, any selection, ordering, highlighting, or recommendation is provided for informational purposes only and does not constitute an endorsement, guarantee of execution quality, or a representation that the best available rate is shown.
We do not warrant that all available providers are included. Provider selection may be based on factors such as liquidity, fees, expected output, response time, reliability, availability, or other criteria and may change over time.
The "Buy ADA" feature links to third-party providers. When you click these links, you leave our Software. We are not responsible for KYC, payment processing, or the delivery of funds by these providers.
The DApp Browser allows you to connect to third-party decentralized applications. We do not vet, audit, or endorse these DApps. Interacting with smart contracts involves high risk.
The Software may contain links to third-party websites where you can purchase hardware wallets or other products ("Affiliate Products"). These links may be affiliate links, meaning Tastenkunst may earn a commission if you make a purchase.
The Software allows you to delegate your ADA to stake pools on the Cardano network. This process is non-custodial; your funds remain in your wallet and are never locked by or transferred to Tastenkunst.
The vast majority of stake pools visible in the Software are operated by third parties. Tastenkunst has no control over these pools, their uptime, fees, or performance.
Tastenkunst may operate its own stake pools (e.g., under the ticker "TITAN").
Staking rewards are determined by the Cardano blockchain protocol. Any Annual Percentage Yield (APY) displayed is an estimation only.
Certain features of the Software may allow you to create, publish, transmit, or display information such as messages, labels, notes, usernames, or other content ("User Content"), including via blockchain transactions and public metadata. If User Content is published to a public blockchain, it may be publicly visible, globally accessible, and effectively immutable. You are solely responsible for deciding what you publish and for any consequences arising from making information public.
You represent and warrant that:
You must not use the Software (including any messaging or content features) to create, transmit, store, or display User Content that:
To the extent the Software (or our infrastructure) technically processes, relays, caches, or displays your User Content (for example, to render blockchain metadata, relay a message request, or deliver notifications you requested), you grant us a non-exclusive, worldwide, royalty-free license to host, reproduce, transmit, cache, display, and perform your User Content solely as necessary to operate, maintain, and provide the relevant feature and to enforce these Terms. This license ends when the User Content is removed from our systems, except to the extent we must retain records for legal compliance or to the extent the User Content persists on a public blockchain outside our control.
We do not generally monitor or pre-screen User Content, and we do not assume a general duty to do so. However, we may implement reasonable measures to prevent abuse, spam, or security risks, and we may review User Content where required by law, in response to notices, or to protect users and the integrity of the Software.
If you believe User Content is unlawful, abusive, or infringes your rights, you may notify us at info@tastenkunst.io.
Please include: (i) a clear description of the content and why you believe it is unlawful/infringing; (ii) where it appears (for example, transaction hash, address, platform, timestamp, or other identifiers; screenshots help); (iii) your name and contact details; and (iv) any supporting information or authority to act (where relevant).
We will review notices in a reasonable timeframe and may take actions such as: removing or limiting display of content within our interfaces; disabling access to a feature; restricting abuse vectors; or taking other measures we deem necessary to comply with law or protect users and the Software. Because blockchain data may be immutable, we may be unable to delete or modify content published on-chain; our actions may therefore be limited to what we can control (for example, how content is displayed within our interfaces).
We may restrict, suspend, or terminate your access to the Software (in whole or in part) if you violate this Section, repeatedly receive valid notices, use the Software for prohibited purposes, or create material legal, security, or operational risk. This is without prejudice to any other remedies and subject to mandatory consumer law.
In the event of a fork in the Cardano blockchain or any other supported network, Tastenkunst reserves the right to determine, in its sole discretion, which chain to support within the Software. We are under no obligation to support both branches of a fork, and you acknowledge that unsupported forked assets may be inaccessible via the Software.
If you access the Software via an application store (e.g., Apple App Store, Google Play), you acknowledge that these Terms are between you and Tastenkunst only, not with the App Store provider. The App Store provider is not responsible for the Software or its content. You agree to comply with all applicable third-party terms of agreement (e.g., your wireless data service agreement) when using the Software.
If you access the Software via the Apple App Store, you acknowledge and agree that Apple, and Apple’s subsidiaries, are third-party beneficiaries of these Terms, and that, upon your acceptance of these Terms, Apple will have the right (and will be deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary thereof.
Subject to these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to use the Software for your personal or internal business use.
The Software and its underlying code (unless open source) remain the property of Tastenkunst GmbH.
If you provide us with any feedback, suggestions, or comments regarding the Software ("Feedback"), you hereby assign to Tastenkunst all rights, title, and interest in and to such Feedback. We are free to use such Feedback for any purpose without acknowledging or compensating you.
Your use of the Software is also governed by our Privacy Policy, which is incorporated into these Terms by reference. Please review the Privacy Policy to understand how we collect, use, and share technical data (e.g., IP addresses, RPC interactions).
In accordance with the EU Data Act, you have rights regarding the access and portability of data generated by your use of the Software. As a non-custodial wallet, essentially all usage data (private keys, address labels, history) is generated and stored locally on your device or publicly on the blockchain, not on Tastenkunst's servers. You retain full control over this data at all times.
You may terminate this agreement at any time by deleting the Software and ceasing all use.
We may suspend access to, or terminate, the Software (in whole or in part) immediately if we reasonably determine that:
Where reasonably possible, we will inform you of the suspension/termination and the main reason.
We may discontinue the Software or terminate this agreement for convenience, provided that:
unless immediate discontinuation is necessary for legal, security, or integrity reasons.
Termination ends your right to use the Software. Because the Software is non-custodial, termination does not affect your ownership of on-chain assets. You remain responsible for securely backing up your recovery phrase/keys and for accessing your assets with compatible software.
Nothing in these Terms limits or excludes mandatory statutory rights of consumers under applicable law. In particular, mandatory rights under German consumer law, including rules for digital products (e.g., §§ 327 ff. BGB), remain unaffected.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE SOFTWARE IS PROVIDED "AS IS" AND "AS AVAILABLE," WITHOUT WARRANTY OF ANY KIND.
WE EXPRESSLY DISCLAIM ALL WARRANTIES, WHETHER EXPRESS, IMPLIED, OR STATUTORY, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT, AND ANY WARRANTIES ARISING OUT OF COURSE OF DEALING OR USAGE OF TRADE.
WE DO NOT WARRANT THAT THE SOFTWARE WILL BE UNINTERRUPTED, ERROR-FREE, SECURE, OR THAT DEFECTS WILL BE CORRECTED, OR THAT ANY INFORMATION PROVIDED THROUGH THE SOFTWARE IS ACCURATE OR RELIABLE.
Nothing in this Section 16 limits or excludes liability where such limitation or exclusion is prohibited by applicable law, and mandatory consumer rights remain unaffected.
Tastenkunst is liable without limitation for damages caused by intent (Vorsatz) or gross negligence (grobe Fahrlässigkeit), for injury to life, limb, or health, or under the German Product Liability Act (Produkthaftungsgesetz).
In cases of slight negligence (einfache Fahrlässigkeit), Tastenkunst is only liable for the breach of material contractual obligations (Cardinal Duties). Cardinal Duties are obligations the fulfillment of which is essential to the proper performance of the contract and on which the User may rely. In such cases, liability is limited to typical, foreseeable damages.
Liability for data loss is limited to the typical recovery effort required had regular backups been made by the User.
Tastenkunst is not liable for losses resulting from:
Tastenkunst shall not be liable for any delay or failure to perform resulting from causes outside its reasonable control, including, but not limited to, acts of God, war, terrorism, riots, embargos, acts of civil or military authorities, fire, floods, accidents, strikes, or shortages of transportation facilities, fuel, energy, labor, or materials.
This Section 18 applies only if you are using the Software as a Business User (Unternehmer). If you are a consumer (Verbraucher), this Section 17 does not apply.
To the extent permitted by applicable law, you agree to indemnify and hold harmless Tastenkunst, its officers, directors, employees, and agents from and against third-party claims, damages, losses, liabilities, and reasonable costs (including reasonable legal fees) arising out of or relating to:
This indemnity obligation applies only to the extent that the claim was caused by you and does not apply to the extent that Tastenkunst is responsible for the claim.
These Terms shall be governed by and construed in accordance with the laws of the Federal Republic of Germany, excluding the UN Convention on Contracts for the International Sale of Goods (CISG).
If the User is a merchant, a legal entity under public law, or a special fund under public law, the exclusive place of jurisdiction for all disputes is Leipzig, Germany. If you are a consumer within the EU, mandatory statutory consumer protection regulations of your country of residence remain unaffected.
We are neither willing nor obliged to participate in dispute resolution proceedings before a consumer arbitration board (Verbraucherschlichtungsstelle).
Should any provision of these Terms be or become invalid or unenforceable in whole or in part, this shall not affect the validity of the remaining provisions. The invalid provision shall be deemed replaced by a valid provision that comes closest to the economic intent of the parties.
These Terms may be translated into other languages for your convenience. In the event of a dispute or inconsistency between the English version and any translated version, the English version of these Terms shall prevail to the extent permitted by law.
We may change these Terms only for valid reasons, such as:
If you are a consumer (Verbraucher), we will notify you of material changes at least 30 days before they take effect by making the updated Terms available in the Software or on our website and providing a clear notice of the effective date and the main changes. You may object to the changes by terminating your use of the Software before the effective date.
If you are using the Software as a Business User (Unternehmer), we will notify you of material changes at least 14 days before they take effect, unless a shorter period is required for legal or security reasons.
Where a change is required by law, a binding authority request, or is necessary to address a security vulnerability or integrity risk, we may apply the change immediately. In that case, we will notify you as soon as reasonably possible.
Continued use of the Software after the effective date of updated Terms constitutes acceptance of the updated Terms only if you had the opportunity to review the changes and (where required by law) the ability to terminate/stop using the Software before they took effect.
These Terms, together with the Privacy Policy, constitute the entire agreement between you and Tastenkunst regarding the Software.
No waiver of any term of these Terms shall be deemed a further or continuing waiver of such term or any other term, and Tastenkunst's failure to assert any right or provision under these Terms shall not constitute a waiver of such right or provision.
NO FINANCIAL ADVICE: The information provided by Eternl and Tastenkunst does not constitute investment advice, financial advice, trading advice, or any other sort of advice.
VALUE VOLATILITY: Crypto assets, including ADA and Cardano native tokens, are highly volatile. You may lose all value in your assets.
TECHNOLOGY RISK: The Software interacts with the Cardano blockchain. Tastenkunst does not control the blockchain. Bugs in the Cardano protocol, 51% attacks, or quantum computing threats could result in loss of funds.
SMART CONTRACT RISK: When you use the "MonsterSwap" feature or interact with DApps via the Browser, you are interacting with smart contracts. These may contain bugs, exploits, or security vulnerabilities that could lead to a total loss of funds. Tastenkunst is not responsible for third-party smart contracts.
REGULATORY RISK: The regulatory status of crypto assets and wallet providers is evolving (e.g., MiCA in EU, SEC in US). New regulations could negatively impact the functionality of the Software or your ability to access your assets.
TAXATION: You are solely responsible for determining what, if any, taxes apply to your crypto transactions. Tastenkunst does not calculate, collect, or report taxes on your behalf.