Who We AreFreedx is a newly established cryptocurrency exchange dedicated to providing a seamless, secure, and innovative trading experience. Our team comprises experienced professionals from the crypto, finance, and technology sectors, all passionate about driving the future of digital finance. At FreedX, we are committed to creating a platform that empowers our clients with the freedom to manage their digital assets confidently and efficiently.Our Vision:At FreedX, our vision is to be the most trusted and reliable cryptocurrency exchange, offering unparalleled freedom and scalability to our clients. We aim to build a platform where users can trade and manage their assets with complete peace of mind, knowing that their security and reliability are our top priorities. We strive to continuously innovate and adapt to the evolving needs of the crypto market, ensuring that our clients have access to the best tools and services to achieve their financial goals. Join us on our journey to redefine the standards of digital asset trading and experience the freedom, reliability, and scalability that FreedX has to offer.RoleWe are seeking a talented Frontend Developer with expertise in React and TypeScript to help build a high-performance, user-friendly interface for our cryptocurrency exchange. As part of the frontend development team, you will be responsible for creating and optimizing responsive, secure, and engaging user interfaces to provide an exceptional trading experience. This is an exciting opportunity to work on complex challenges in a fast-paced environment, with a focus on financial data, real-time updates, and a seamless user experience in the growing crypto industry. Key Responsibilities UI Development: Design and develop responsive and visually appealing user interfaces using React and TypeScript, ensuring a seamless and consistent user experience across devices. Real-Time Data Handling: Implement features to handle and display real-time trading data, charts, and notifications efficiently. Component Development: Create reusable components and libraries, adhering to best practices in design and coding standards. API Integration: Integrate with backend RESTful APIs and WebSocket services to facilitate data communication and real-time updates for trading activities and market data. Performance Optimization: Ensure high performance of the frontend application, optimizing for speed, responsiveness, and scalability. Security & Compliance: Follow security best practices to protect user data, particularly in relation to account and transaction information. Cross-Functional Collaboration: Work closely with UX/UI designers, backend developers, and QA engineers to deliver new features and improve existing ones based on user feedback. Testing & Quality Assurance: Write and maintain unit and integration tests to ensure high code quality, stability, and reliability. Documentation: Document code and maintain records of frontend standards, component libraries, and key processes to support development consistency. RequirementsRequired Skills & Experience Technical Proficiency: 3+ years of experience with frontend development, specifically with React and TypeScript. Strong knowledge of modern JavaScript (ES6+) and CSS. React Ecosystem: Proficiency with React libraries and tools (e.g., Redux, React Query, React Router) and component-based development. UI/UX Sensibility: Strong sense of design and attention to detail, with experience implementing UI designs and interactions for high-quality user experiences. Data-Driven Interfaces: Experience with real-time data handling, charting libraries (e.g., D3.js, Chart.js), and performance optimization. API Integration: Experience integrating with RESTful APIs and WebSocket services. Crypto & Fintech Knowledge: Familiarity with blockchain, cryptocurrency trading, or financial data is a plus. Testing & QA: Experience with testing frameworks such as Jest, Enzyme, or React Testing Library. Problem-Solving: Strong analytical skills and ability to solve complex technical challenges in a fast-paced environment. Communication Skills: Excellent communication and teamwork skills to collaborate effectively with a diverse team. Preferred Qualifications Experience with state management libraries (Redux, MobX) and custom hooks Familiarity with CI/CD pipelines and version control (Git) Knowledge of Web3, blockchain, or financial applications Experience working with design systems and component libraries BenefitsWhat We Offer:Competitive salary and performance-based discretionary bonuses,Flexible work schedule, hybrid/remote work opportunityGenerous paid leaveOpportunity for professional developmentFreedX is an equal opportunity employer. We stand for an open and inclusive work environment that fosters the well-being of everyone. We embrace and encourage differences in age, color, disability, ethnicity, family or marital status, gender identity or expression, language, national origin, physical and mental ability, race, religion, sexual orientation, socio-economic status, veteran status, and other characteristics that make our people unique.About the companyWho We AreFreedX is a newly established cryptocurrency exchange dedicated to providing a seamless, secure, and innovative trading experience. Our team comprises experienced professionals from the crypto, finance, and technology sectors, all passionate about driving the future of digital finance. At FreedX, we are committed to creating a platform that empowers our clients with the freedom to manage their digital assets confidently and efficiently.Our Vision:At FreedX, our vision is to be the most trusted and reliable cryptocurrency exchange, offering unparalleled freedom and scalability to our clients. We aim to build a platform where users can trade and manage their assets with complete peace of mind, knowing that their security and reliability are our top priorities. We strive to continuously innovate and adapt to the evolving needs of the crypto market, ensuring that our clients have access to the best tools and services to achieve their financial goals.Join us on our journey to redefine the standards of digital asset trading and experience the freedom, reliability, and scalability that FreedX has to offer.

What are we all about? We are a team of builders and researchers on a mission to empower enterprises and developers worldwide to access and build on decentralized systems. Our expertise covers several domains: Ethereum and Starknet protocol engineering, layer-2, cryptography research, protocol research, decentralized finance (DeFi), security auditing, formal verification, real-time monitoring, smart contract development, and dapps and enterprise engineering. Working to solve some of the most challenging problems in the blockchain space, we frequently collaborate with renowned companies, such as Ethereum Foundation, Starknet Foundation, Gnosis Chain, Flashbots, Forta Protocol, Lido, EigenLayer, Open Zeppelin, RISCZero, Aleph Zero, and many more. Today, we are a 350+ strong team working remotely across 66+ countries. View all our open positions here: https://www.nethermind.io/open-roles Are you the one? The Role: We are currently seeking a highly skilled and experienced Infrastructure Engineer to join our dynamic team. The ideal candidate will have a strong background in task automation, integration setup, and cloud infrastructure maintenance, and the ability to collaborate seamlessly with the DevOps Lead. Your commitment to delivering top-notch solutions and exceptional support to our internal products will be crucial in this role. Additionally, your alignment with Nethermind's vision of leading in blockchain technology, promoting innovation, and nurturing growth within the industry is essential. Responsibilities: Lead the implementation and optimization of Okta for seamless identity and access management with a strong focus on automation, collaborating closely with the DevOps Lead and team. Foster communication across departments to ensure smooth integration deliveries, actively engage with stakeholders to gather requirements and provide regular progress updates. Develop and maintain tailored integrations across various platforms and technologies, continually optimizing them for enhanced performance and reliability. Implement and manage GitHub CI/CD pipelines for streamlined development workflows, working closely with development teams to ensure efficient code integration, delivery, and security. Create comprehensive technical documentation for configurations, integrations, and CI/CD pipelines, while mentoring and guiding junior team members to foster skill development and knowledge transfer. Skills: 2-5 + years of experience in a DevOps/Infrastructure/Cloud Engineer role Strong experience with setting up Okta on multiple services and platforms, including Cloud Providers, SaaS, and GSuite**.** Strong experience with designing and building CICD pipelines Strong experience with IaC technologies, for example, Terraform and Ansible. Proficiency in AWS & GCP services. Strong troubleshooting skills. Good communication skills and stakeholder management experience Experience producing operational and design documentation for the things you build. Experience with continuous integration and continuous delivery tools, like GitHub Actions. Proficiency in any high-level programming languages (preferably Python/Go). Nice to have: Any blockchain experience is a plus. Experience with JFrog integrations and package deployments. Disclaimer: I hereby consent to my personal information being stored and processed by Demerzel Solutions Limited (t/a Nethermind) (the “Company”) for recruitment purposes in relation to both the selected job role and any other role the Company considers me a qualified candidate for. All data storing and processing by the Company takes place in accordance with the UK GDPR. Kindly refer to our privacy policy for more details. Your consent to share personal information is entirely voluntary, and you may withdraw your consent at any time. Should you have any questions about this process, or wish to withdraw your consent please contact: [email protected] Keep up to date on what we are working on by following us on our social channels       Click here to view our Privacy Policy.

Parity is one of the world's most experienced core blockchain infrastructure companies, having built and pioneered some of the most advanced technologies in the blockchain sector. Parity was founded by Dr. Gavin Wood, co-founder and former CTO of Ethereum, the primary engineer behind the Ethereum Virtual Machine (EVM), inventor of the Solidity programming language, and primary author of the Ethereum “Yellow Paper”. Based in Berlin, London, Zug and Lisbon, Parity has built clients for Ethereum, Bitcoin, and Zcash and has pioneered a completely new, next-generation blockchain protocol with Polkadot and the framework it’s built with, Substrate. Parity builds the open-source technologies needed to power an unstoppable, decentralised web—known as Web3—and helps developers and organisations implement and build upon the Web3 tech stack. People in our collective are: Highly motivated to contribute to Parity’s mission and be part of something bigger Excited to work on projects that are groundbreaking and complex Autonomous, but also collaborate well with others Take maximum accountability and have minimum ego at work Comfortable with chaos and adapting to the ever-changing Web3 space Continuously educating themselves about Parity and the wider Polkadot ecosystem We are looking for an experienced, independent and self-starting UK qualified Legal Counsel for a permanent role here in Parity technologies. Our business  focuses on blockchain and decentralised technologies. This role will support the business across its functions, in particular on licensing and intellectual property; structuring, negotiating and drafting software development and advisory agreements; privacy issues; and corporate governance. The ideal candidate will have trained with a reputable firm; gained in-house experience within an organisation similar to Parity (IP rich, open source, privacy centric, software focussed); experience in negotiating and drafting software development and licensing agreements and supporting businesses with privacy compliance and corporate governance; interested in and a passion for open source and Web3 and Blockchain. About the team: The legal team advises and supports Parity across all of the business. We are a fun hardworking team of 3 lawyers, 1 Trainee Solicitor and a Legal & Finance associate headed up by the Chief Legal Officer and Chief Operating Officer (Interim) (Chrissy Hill). The work of the team is varied and challenging supporting a fast moving business which is growing rapidly. About the Position: Reporting to the Director of Legal, the Legal Counsel provides proactive legal support to all areas of the business. Key responsibilities include: Ensuring optimal corporate organisation and compliance in corporate governance. Reviewing, drafting, and negotiating commercial contracts and legal agreements across the business. Developing and managing Parity’s IP strategy, liaising with internal stakeholders and external legal counsel. Overseeing commercial litigation in collaboration with external counsel. Monitoring the legal and regulatory environment related to blockchain. Handling ad hoc projects as required by business needs. Providing accurate, timely advice to internal stakeholders, including senior management, on a variety of legal topics (e.g., licensing, intellectual property, privacy, corporate law, partnerships, and commercial agreements). Applying effective risk management techniques and proactively addressing potential legal issues. Communicating, negotiating, and managing relationships with external parties (e.g., service providers, partners, external counsel, public authorities). Drafting and reviewing agreements, contracts, and other legal documents to protect the company’s legal rights. Managing complex matters with multiple stakeholders. Clarifying legal language or specifications for organisational understanding. Keeping up-to-date with industry and business-specific legislation and legal developments. Understanding blockchain, decentralised technologies, and Parity’s technology stack to advise on related legal matters. About you: You are 3 years plus PQE UK Qualified commercial lawyer with a minimum of 1 years in house experience  You are commercially aware with in house legal experience. Knowledge of blockchain is going to be nice to have, however an interest in and desire to learn about blockchain, open source and decentralised systems will be the key drivers and requirements of the candidate’s mindset and background. Specific areas of knowledge and experience that would be welcome: Corporate law. Drafting and negotiating commercial software agreements; and Privacy and data protection. Key characteristics: self-starter and able to work independently, someone who is willing and keen to work in a relatively new industry and uncertain regulatory environment, and someone that is comfortable working within ambiguity. About working for us: Competitive remuneration packages based on iterative market research, including tokens (where legally possible) “Future of work” environment that’s remote-first and self-initiating with flexible hours Team mates that are genuinely excited about their impact and projects Access to the brightest minds in this space to learn about Web3 and develop your skills and knowledge while on the job Becoming part of the wider ecosystem (career and networking opportunities) Team and company-wide retreats Work laptop   Those joining our collective as an employee in Germany, Portugal, and the U.K. also enjoy benefits such as health care, parental leave, PTO (28 days per year), local team events.   Parity is an Equal Opportunity Employer. We welcome diversity in our global team and care about everyone in our collective feeling included and welcome.   View our Applicant Notice to see how we use your data.   Is this position not quite your match? Browse our other open roles.

Join Tether and Shape the Future of Digital FinanceAt Tether, we’re not just building products, we’re pioneering a global financial revolution. Our cutting-edge solutions empower businesses—from exchanges and wallets to payment processors and ATMs—to seamlessly integrate reserve-backed tokens across blockchains. By harnessing the power of blockchain technology, Tether enables you to store, send, and receive digital tokens instantly, securely, and globally, all at a fraction of the cost. Transparency is the bedrock of everything we do, ensuring trust in every transaction. Innovate with TetherTether Finance: Our innovative product suite features the world’s most trusted stablecoin, USDT, relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services.But that’s just the beginning:Tether Power: Driving sustainable growth, our energy solutions optimize excess power for Bitcoin mining using eco-friendly practices in state-of-the-art, geo-diverse facilities.Tether Data: Fueling breakthroughs in AI and peer-to-peer technology, we reduce infrastructure costs and enhance global communications with cutting-edge solutions like KEET, our flagship app that redefines secure and private data sharing.Tether Education: Democratizing access to top-tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity.Tether Evolution: At the intersection of technology and human potential, we are pushing the boundaries of what is possible, crafting a future where innovation and human capabilities merge in powerful, unprecedented ways. Why Join Us?Our team is a global talent powerhouse, working remotely from every corner of the world. If you’re passionate about making a mark in the fintech space, this is your opportunity to collaborate with some of the brightest minds, pushing boundaries and setting new standards. We’ve grown fast, stayed lean, and secured our place as a leader in the industry.If you have excellent English communication skills and are ready to contribute to the most innovative platform on the planet, Tether is the place for you.Are you ready to be part of the future? About the job We are looking for a hands-on proactive, experienced and passionate writer to lead the technical documentation efforts across all Tether products. In this role, you will be responsible for the documentation for our open source projects and our platform products which includes public npm modules and robust, modular codebase. Responsibilities: Proactively update the documentation to match the rapid development pace of the development team.Writing and improving documentation, guides, FAQs, etc.Developing high quality proof of concept application and example snippets.Staying aware of questions and issues faced by the community and improving the documentation to support them better 3+ years of experience in Node.js developing high-quality, clean and efficient code. Experience with C/C++ is good to have.2+ years of experience in documentation writing and is highly proficient in the English language.Good experience in reading code across different programming languagesPassion and experience working with open source technologies.Remote Collaboration: Since our team is distributed globally, experience in remote collaboration and communication is essential to align with our dynamic and fast-paced environment. Experience with Git and markdown are essential.

Who We Are FreedX is a newly established cryptocurrency exchange dedicated to providing a seamless, secure, and innovative trading experience. Our team comprises experienced professionals from the crypto, finance, and technology sectors, all passionate about driving the future of digital finance. At FreedX, we are committed to creating a platform that empowers our clients with the freedom to manage their digital assets confidently and efficiently. Our Vision At FreedX, our vision is to be the most trusted and reliable cryptocurrency exchange, offering unparalleled freedom and scalability to our clients. We aim to build a platform where users can trade and manage their assets with complete peace of mind, knowing that their security and reliability are our top priorities. We strive to continuously innovate and adapt to the evolving needs of the crypto market, ensuring that our clients have access to the best tools and services to achieve their financial goals. Join us on our journey to redefine the standards of digital asset trading and experience the freedom, reliability, and scalability that FreedX has to offer. Role Overview: As a Senior Technical Support Agent (L2) at FreedX, you are responsible for providing advanced support for complex technical issues and escalations from the Customer Support team. This role focuses on resolving in-depth technical problems, including platform functionality, account security, blockchain transactions, and trading-related inquiries. Working closely with cross-functional teams, you will document resolutions, contribute to the knowledge base, and support L1 agents by sharing expertise to enhance team capabilities. Key Responsibilities: Advanced Troubleshooting and Escalation Management: Address complex technical issues, including platform functionality errors, technical trading inquiries, blockchain transactions, and escalations related to security. Cross-Functional Collaboration: Work closely with product, compliance and other teams to resolve technical issues, acting as the bridge between customer support and technical departments. VIP Client Requests: Serve as a primary contact for VIP clients, ensuring a high level of responsiveness and resolution for priority cases. Knowledge Base Contribution and Documentation: Document solutions for intricate issues to expand the knowledge base, aiding in the training of L1 agents and improving the customer self-service portal. Continuous Improvement and Training: Provide feedback to L1 agents on common issues, supporting their growth and helping to reduce escalations through enhanced knowledge transfer. Requirements3 years of technical support experience, with at least 1 providing support to a crypto or web3 product. In-depth knowledge of platform troubleshooting, blockchain transactions, trading, and account security practices. Extensive knowledge about cryptocurrencies and cryptocurrency trading practices. Knowledge about blockchain and how blockchain transactions are done.  Exceptional analytical skills, with the ability to diagnose and resolve complex issues. Proven ability to work cross-functionally and communicate technical information effectively. Experience with documentation processes and creating resources for support teams. Leadership skills to guide L1 agents during your shift and help them develop.  Comfortable with using all channels of support: Chat, Email, Phone and Social Media.  BenefitsWhat We Offer:Competitive salary and performance-based discretionary bonuses,Flexible work schedule, remote work opportunityGenerous paid leaveOpportunity for professional development, participation to industry eventsFreedX is an equal opportunity employer. We stand for an open and inclusive work environment that fosters the well-being of everyone. We embrace and encourage differences in age, color, disability, ethnicity, family or marital status, gender identity or expression, language, national origin, physical and mental ability, race, religion, sexual orientation, socio-economic status, veteran status, and other characteristics that make our people unique.About the companyWho We AreFreedX is a newly established cryptocurrency exchange dedicated to providing a seamless, secure, and innovative trading experience. Our team comprises experienced professionals from the crypto, finance, and technology sectors, all passionate about driving the future of digital finance. At FreedX, we are committed to creating a platform that empowers our clients with the freedom to manage their digital assets confidently and efficiently.Our Vision:At FreedX, our vision is to be the most trusted and reliable cryptocurrency exchange, offering unparalleled freedom and scalability to our clients. We aim to build a platform where users can trade and manage their assets with complete peace of mind, knowing that their security and reliability are our top priorities. We strive to continuously innovate and adapt to the evolving needs of the crypto market, ensuring that our clients have access to the best tools and services to achieve their financial goals.Join us on our journey to redefine the standards of digital asset trading and experience the freedom, reliability, and scalability that FreedX has to offer.

Ethereum Name Service (ENS) is a decentralized, permissionless naming system built on the Ethereum blockchain that enables human-readable names (like "myname.eth") to be linked to standard Ethereum addresses and other distributed systems.As one of the first protocols built on Ethereum, ENS has enabled over 3 million registered .eth names, and over another 20 million ENS names from teams such as Coinbase, Uniswap, and Linea, as well as integrations with hundreds of other apps, wallets, protocols, and browsers in the crypto ecosystem.ENS Labs has been driving the core development of the ENS protocol since 2018. We created the ENS app, open-source libraries, and core smart contracts. We are on a mission to make crypto-powered experiences as easy and accessible as browsing the web. Join us as we build the next iteration of our protocol, ENSv2, and pioneer a more decentralized, flexible, and scalable ENS for the future.About the RoleAs a Technical Writer at ENS, you will be responsible for creating and maintaining high-quality, user-friendly documentation that empowers developers, partners, and users to seamlessly understand, integrate with, and utilize ENS.You will collaborate closely with engineering teams to stay informed on new features and updates, ensuring all documentation is accurate, comprehensive, and reflects the latest developments within the ENS ecosystem. This role requires a strong grasp of blockchain technologies, a passion for clear communication, and the ability to translate complex technical concepts into accessible, easy-to-understand content.What You'll DoCreate clear, concise, and comprehensive technical documentation for ENS APIs, smart contracts, developer tools, and user-facing products.Develop user-friendly guides, tutorials, and best practices to help developers and users seamlessly integrate ENS into their applications.Produce educational content to onboard new users and developers, ensuring a smooth and intuitive introduction to ENS.Maintain and update existing documentation to reflect new features, enhancements, and bug fixes.Write release notes that highlight new features, improvements, and bug fixes for both users and developers.Collaborate closely with engineering teams to transform complex technical details into easily digestible documentation.Develop a content strategy tailored to different audiences, including developers, product teams, and non-technical users.Respond to community inquiries and contribute to frequently asked questions (FAQs) related to ENS, its functionalities, and the broader ecosystem.Who You AreProven experience as a technical writer, ideally with a focus on blockchain, Web3, or other highly technical domains.Expertise in writing developer documentation, API documentation, and user guides for technical and non-technical audiences.Strong familiarity with the Ethereum ecosystem, decentralized applications (dApps), smart contracts, and decentralized identity.Exceptional writing skills, with the ability to simplify complex technical concepts into clear, accessible content.Proficiency in tools like Markdown, GitHub, Confluence, and other content management systems.Experienced with Git and version control, particularly managing open-source documentation on platforms like GitHub.Skilled at tailoring content to diverse audiences, adjusting tone and complexity to effectively communicate with both technical and non-technical readers.It's a Plus, if You HaveFamiliarity with ENS or other decentralized technologies.Knowledge of CMS and SEO best practices for technical documentation.Experience writing tutorials, case studies, or thought leadership articles in the blockchain/Web3 space.Contributions to open-source projects or GitHub repositories.

Ethereum Name Service (ENS) is a decentralized, permissionless naming system built on the Ethereum blockchain that enables human-readable names (like "myname.eth") to be linked to standard Ethereum addresses and other distributed systems. As one of the first protocols built on Ethereum, ENS has enabled over 3 million registered .eth names, and over another 20 million ENS names from teams such as Coinbase, Uniswap, and Linea, as well as integrations with hundreds of other apps, wallets, protocols, and browsers in the crypto ecosystem. ENS Labs has been driving the core development of the ENS protocol since 2018. We created the ENS app, open-source libraries, and core smart contracts. We are on a mission to make crypto-powered experiences as easy and accessible as browsing the web. Join us as we build the next iteration of our protocol, ENSv2, and pioneer a more decentralized, flexible, and scalable ENS for the future. We are seeking a highly skilled ZK Engineer to join our team and help integrate Zero-Knowledge proofs into ENS protocol to enhance its security, scalability, and privacy features.   About the Role The ZK Engineer will be responsible for developing, implementing, and optimizing Zero-Knowledge proof solutions within the ENS ecosystem. This includes working on privacy-preserving features, transaction verification, and scalability solutions that will enable ENS to meet the growing demands of the Web3 community. You will collaborate with cross-functional teams to integrate ZK technology into ENS’s existing and future infrastructure, ensuring that new features align with decentralized principles and privacy concerns. The ideal candidate will have a deep understanding of cryptographic protocols, particularly Zero-Knowledge proofs, and how they can be applied to blockchain ecosystems. Experience in Ethereum, zk-SNARKs, zk-STARKs, or similar ZK protocols is a significant plus.   What You'll Do Design, implement, and optimize Zero-Knowledge proof systems (such as zk-SNARKs or zk-STARKs) to improve the privacy, scalability, and performance of the ENS platform. Collaborate with the product and engineering teams to develop privacy-preserving features for ENS users, ensuring that sensitive data is protected while maintaining decentralization. Work closely with Ethereum and blockchain engineers to integrate ZK solutions with existing Ethereum smart contracts, layer-2 protocols, and other decentralized systems. Implement Zero-Knowledge scalability solutions to optimize ENS performance, ensuring security and integrity through testing and auditing cryptographic proofs and smart contracts. Work closely with other engineers to ensure seamless integration of ZK features across the ENS platform. Contribute to the ENS community and the broader Ethereum ecosystem by sharing knowledge about ZK technologies, best practices, and new developments in privacy and scalability solutions.   Who You Are 3+ years of experience with Zero-Knowledge proofs or cryptographic tech in blockchain or distributed systems. Proficient in ZK protocols and privacy-enhancing cryptographic techniques. Hands-on experience with Ethereum smart contracts, Layer-2 solutions, and blockchain tech. Strong understanding of Ethereum, DeFi, and Web3 ecosystems. Excellent problem-solving skills, applying ZK to privacy, scalability, and security challenges. Experience designing and implementing cryptographic solutions in decentralized systems. Strong communication skills, able to explain complex concepts to technical and non-technical audiences.   It’s a Plus, If You Have Familiarity with Ethereum Layer-2 protocols (e.g., Optimistic Rollups, zk-Rollups) and their interaction with Zero-Knowledge proofs. Experience with formal verification of cryptographic protocols or smart contracts. Contributions to open-source cryptographic projects or publications in cryptography and blockchain.