{"schema":"BUIDL","d":{"id":19578,"members":[],"pictures":["https://cdn.dorahacks.io/static/files/193626f4b09f0e5839d75324d96b5ad5.png"],"roundProjects":[],"hackathonProjects":[{"id":21348,"hackathon":{"id":617,"tabSet":[{"id":1093,"name":"Submission Guide","slug":"submission-guide","description":"# Tutorial Video\n\n![YouTube](https://youtu.be/yWhQPzxptg0)\n\n# **Getting Started [3-5 MIN]**\n\n**1.** **Submit your BUIDL via [DoraHacks.io](https://dorahacks.io/). You need an account with DoraHacks before you can submit.**\n\nUse the **Log in** button in the upper right corner of the page to access the sign-up options.\n\n

\n\nYou can create your account with either your **GitHub account, Google account, crypto wallet** or **email address**. We recommend connecting your account to GitHub to share your projects with a wider audience.\n\n*If asked for a verification code via email, the email may take a few minutes to arrive. The code expires 10 minutes after you click “**send code**”.\n\n**2.** **Before the submission deadline, make sure you have added your Github link to the project. You can submit the project first, and continue editing until the deadline.**\n\nClick “**Submit BUIDL**”.\n\n

\n\n\n> **→ Already have a BUIDL on DoraHacks?**\n> \n\n1. Click “**Use existing BUIDL**” and select your BUIDL project.\n2. Choose the track you want to enter. \n3. Answer the questions set by the organizer in the input field if applicable.\n\n

\n\n\n> **→ Submitting a new BUIDL?**\n> \n> Click **“Create new BUIDL”** and fill out the form with your project details.\n\n

\n\nBe sure to include **URLs (with http/https://)** for your demo, demo link, and social media.\n\n

\n\n

\n\nOnce you’ve completed the new BUIDL setup, select the relevant track, and click **“Submit for review”**.\n\n

\n\nAfter submitting successfully, you'll see this notification.\n\n

\n\n# **Manage BUIDL submission**\n\nAfter submitting your application, the \"Submit\" button will update to \"Manage Submission\". Click the button to manage your BUIDL's Track/Bounty submission.\n\n

\n\n# **Project Approval**\n\nAfter submission, your project needs to be approved by the Hackathon Organizer before it becomes publicly visible in the Hackathon [BUIDLs gallery](https://dorahacks.io/hackathon/617/buidl).\n\n

\n\n# **Getting Support**\n\nIf you have any questions for the hackathon organizers, feel free to contact them via their dedicated Telegram, Discord, or Slack communication channel. You can also click the \"**Message**\" button next to the organizer's logo to DM them on DoraHacks.\n\n# **Want to Update Your BUIDL?**\n\nHead to your Account Center by clicking **[Avatar] -> [Profile]**. Find your project and hit the **Edit** button on its detail page to make changes.\n\n

\n\n

"}],"skills":null,"applied":false,"isCurrentHackerRegistered":false,"buidlsCount":31,"applicationsCount":31,"organization":{"id":2745,"name":"Aeternity","logo":"https://cdn.dorahacks.io/static/files/192520ed02b1de6196519664bb6bd8a6.png"},"description":"# Code Beam æternity Challenge: Elixir and Erlang Hackathon\n\n### Build Decentralized Solutions at the Code Beam 2024 Hackathon with æternity\n\nCreate decentralized applications that solve real-world challenges using æternity's blockchain, Erlang, and Elixir at the Code Beam æternity Hackathon.\n\nIf you're a developer, blockchain enthusiast, or AI innovator, the **Code Beam æternity Challenge: Elixir and Erlang Hackathon** is calling your name. Running from **October 4th to December 1st, 2024**, this is your chance to create decentralized solutions using æternity’s advanced blockchain technology alongside Erlang and Elixir.\n\n---\n\n# Event Overview\n- **Dates**: September 4th – December 1st, 2024 \n- **Location**: Hybrid (Online & In-Person) \n- **On-Site Venue**: The Estrel Congress Centre, Berlin (October 14th–15th) \n- **Online Platform**: [DoraHacks ](https://dorahacks.io/hackathon/aeternity-codebeam2024/detail) \n\n---\n\n# Why You Should Join\n\nThe Code Beam æternity Hackathon is the perfect opportunity for you to bring your ideas to life. Whether you're part of the Erlang and Elixir community or just getting started with æternity, this event will push you to build innovative decentralized applications (dApps) using AI, oracles, state channels, and middleware on the æternity blockchain.\n\nYou’ll work with **Sophia**, æternity’s smart contract language, and tap into the full power of **Erlang and Elixir** for backend and middleware development. Along the way, you’ll collaborate with like-minded peers to solve real-world problems, automate tasks, secure data, and create scalable solutions.\n\n**Here’s what you’ll get to do:**\n\n- **Innovate**: Build dApps that integrate AI, oracles, and state channels. \n- **Collaborate**: Work with fellow developers and learn directly from experts in blockchain and Erlang/Elixir. \n- **Showcase**: Present your work to judges and key industry leaders. \n- **Win**: Compete for a share of **$23,000 worth $AE Tokens**.\n\n---\n\n## What to Build\n\nParticipants are expected to deliver a prototype that integrates at least one of the following, utilizing the æternity blockchain and Sophia, with special consideration for solutions using Erlang/Elixir:\n\n### AI Chatbots\nBuild an AI-powered chatbot with blockchain-backed features, such as secure identity verification or data privacy.\n\n### Oracles\nDevelop a decentralized oracle solution using Sophia and Erlang/Elixir for backend processing to verify off-chain data.\n\n### State Channels\nCreate a scalable dApp using æternity’s state channels for private, off-chain transactions. Erlang/Elixir may be used for the middleware to manage high transaction volumes.\n\n### FATE Compiler\nThe task is to build a FATE compiler that compiles from a language other than Sophia to FATE. For example, you could create a compiler that translates Go, Erlang, Elixir, Lisp, Lua, or any other language to FATE. This will broaden the range of languages that can interact with the æternity blockchain.\n\n---\n\n# Is This the Right Opportunity For You?\n\nIf you’ve got skills in AI development, blockchain technology, UI/UX design, or backend development with Erlang and Elixir, this hackathon is perfect for you. You can join with a team of **2–5 members**, or find teammates along the way.\n\n**Here’s what you need:**\n\n- **AI Development**: Chatbots and machine learning \n- **Blockchain Development**: æternity and Sophia smart contracts \n- **Backend Development**: Erlang and Elixir \n- **UI/UX Design**: Web or mobile applications \n- **Full-Stack or Frontend Development**\n\n---\n\n# Event Timeline\n\n- **Registration Opens**: October 4th, 2024, at 12:00 PM UTC \n- **Registration Closes**: October 14, 2024, at 1:00 AM UTC \n- **On-Site Hackathon**: October 12–13, 2024 \n- **Submission Deadline**: November 29th , 2024, at 12:00 PM UTC \n- **Judging Period**: November 30th, 2024 \n- **Winners Announced**: December 1st, 2024, at 8:00 PM UTC \n\nReady to get started? Register Below\n\n---\n\n# What’s in It for You?\n\n- **1st Place**: $15,000 in $AE Tokens \n- **2nd Place**: $5,000 in $AE Tokens \n- **3rd Place**: $3,000 in $AE Tokens \n\nExperts will judge your project from the æternity blockchain and Erlang/Elixir communities. This is your chance to make your mark and stand out.\n\n---\n\n# How Your Project Will Be Judged\n\nYour project will be evaluated based on these key criteria:\n\n1. **Innovation and Creativity (25%)** \n - How creatively you leverage æternity’s blockchain (Sophia, state channels, oracles). \n - How you apply Erlang/Elixir for backend or middleware solutions. \n\n1. **Technical Complexity (25%)** \n - How well you integrate æternity’s blockchain with Erlang/Elixir. \n - The quality, scalability, and documentation of your code. \n\n1. **Impact and Feasibility (25%)** \n - How well your solution solves real-world problems. \n - How scalable it is within æternity’s ecosystem. \n\n1. **Presentation and Clarity (25%)** \n - How clearly you communicate your ideas and show your demo. \n\n---\n\n# What You’ll Need to Submit\n\n- **A Functional Prototype**: A working dApp built on æternity using Sophia (and Erlang/Elixir if applicable). \n- **GitHub Repository**: Provide clear instructions for deploying your project on the æternity network. \n- **Video Presentation**: A 5-minute video explaining your solution and technical implementation. \n- **Pitch Deck (Optional)**: Summarize the problem you’ve solved and your roadmap for the future. \n\n---\n\n# License Attribution\n\nYou’re encouraged to use open-source licenses for your project. You can choose from:\n\n- **MIT License**: A permissive license allowing modification and distribution with attribution. \n- **GPL License**: Requires modified versions of the code to remain open-source. \n- **Apache 2.0 License**: Protects contributors from patent claims.\n\nIf you’re not using an open-source license, clearly state the terms in your project’s repository.\n\n---\n\n# Ready to Make Your Mark?\n\nThis is your chance to push the boundaries of blockchain technology, learn from experts, and showcase your work to the world. You’ll have access to mentors, cutting-edge tools, and the chance to contribute to the growth of the æternity ecosystem. Who knows, you might even secure a grant for future development.","onboardingCompleted":false,"registerFormUrl":null,"preRegisterTime":1729026000,"publicContactHackerHandle":"rankko-eth","hackersCount":77,"winnerAnnounced":true,"teamCount":0,"title":"Hack With æternity at CodeBeam Europe 2024","uname":"aeternity-codebeam2024","imageUrl":"https://cdn.dorahacks.io/static/files/192522912767a602c069e1040f7a37af.jpg","originUrl":null,"startTime":1727949600,"endTime":1732878000,"timezone":"-120","city":null,"visible":true,"approvalStatus":6,"state":0,"voteUrl":null,"voteMechanism":null,"bonusPrice":23000,"bonusMechanism":null,"followersCount":0,"ecosystem":"FATE Virtual Machine (VM),Sophia Smart Contract Language,State Channels,Oracles,Erlang-Based Architecture","applyGuide":null,"weight":0,"participationForm":"Virtual","field":"blockchain,ai,oracles,state channels,elixir,erlang,sophia","email":null,"contacts":"Telegram,Eviln9ne","externalContacts":null,"telegram":"Eviln9ne","discord":null,"whatsapp":null,"wechat":null,"prizeFundingEscrowed":0,"token":"USD","prizeSafeForm":0,"prizeSafeNetwork":null,"prizeSafeOwner":null,"prizeSafeWallet":null,"prizeSafePublishDate":null,"hasOnboarding":false,"isPublicTrackJudging":false,"isEndedTrackJudging":false,"question":null,"countryId":null,"cityId":null,"venueName":null,"venueAddress":null,"category":2,"isEnableBounty":true,"isBountyRequired":false,"isEndedBountyJudging":false,"bountiesLimitForBuidl":10,"isPublicBountyJudging":false,"isMultiTracksAllowed":false,"tracksLimitForBuidl":0,"showIdeaTab":true,"showQuestionTab":true,"showTeamTab":false,"bonusDescription":[],"askHackers":[],"isEnabledQuestions":false,"isEnabledAskHackers":false,"isBuidlsPrivate":false,"trackJudgingMaxScore":100,"bountyJudgingMaxScore":100,"isExtended":false,"oldEndTime":null,"status":2},"status":4,"bounty":null,"track":null,"table":"0","trackObj":{"id":1626,"name":"[DEFAULT_TRACK]","judgingCriteria":"","weight":0},"bountyObjs":[]}],"chain":[],"chainList":[],"appliedGrant":false,"acceptRewards":false,"owner":183050,"ownerInfo":{"nickname":"hacker6da70ac","username":"U_e40defcfd14da1","avatar":"https://cdn.dorahacks.io/images/hacker-avatar/1.jpg"},"visible":true,"deleted":false,"continuousSponsoring":false,"pageView":0,"sponsoredCount":0,"starCount":0,"sponsoredAmount":"0.00","sponsoredPersons":0,"followers":0,"voteCount":0,"projectMembers":[],"bnbRound":null,"doraGrantDaoTags":[],"techTrees":[0],"infrastructureTags":[71],"otherInfrastructures":[],"lastEditor":{"id":183050,"username":"U_e40defcfd14da1","date":1734352013000},"upvoted":false,"followed":false,"upvoters":{"count":0,"list":[]},"kycStatus":0,"ideas":[],"name":"Feæder","techniqueField":"","source":"-","vision":"Feæder enables the seamless transfer of secure, tamper-proof data from off-chain sources to æternity smart contracts.","projectDescription":"## A. Introduction \nIn the rapidly evolving blockchain ecosystem, the need for reliable access to external data and secure randomness is more critical than ever. Smart contracts, though powerful, are inherently isolated from the real world. This limitation creates challenges for decentralized applications (dApps) that require real-time information or randomness to function effectively.\n\nFeæder is a decentralized oracle network built on the Æternity blockchain, designed to bridge this gap. By delivering real-world data and secure randomness to smart contracts, Feæder empowers developers to build robust, feature-rich, and trustless dApps. Whether it’s real-time token prices, sports scores, weather data, or fair randomness for gaming and governance.\n\n#### Subscription\nFeæder offers a subscription system that simplifies the funding and management of multiple consuming contracts. Users can create a subscription account, fund it with Æternity's native token, and link multiple consuming contracts. When these contracts request data, the transaction costs are calculated after the requests are fulfilled, and the subscription balance is deducted accordingly. This centralized funding model ensures efficient resource allocation and streamlined operations for dApps needing frequent or large-scale data requests.\n\n## B. Our Solutions \n#### 1. Data feeds\n\nData feeds provide decentralized applications (dApps) with reliable and real-time access to external information, bridging the gap between the blockchain and the real world. Feæder offers two types of data feeds, each serving distinct use cases:\n\n###### 1.1. Push based\n\nPush-based feeds continuously update smart contracts with real-time data. This approach is ideal for scenarios requiring low-latency data delivery, such as:\n\n- **Decentralized Finance (DeFi)**: Updating token prices for automated market makers (AMMs) or lending platforms.\n\n- **Sports Applications**: Delivering live scores or game stats for prediction markets and fantasy sports.\n\nFeæder aggregates, verifies, and streams data directly to Æternity-based smart contracts, ensuring data consistency and accuracy.\n\n###### 1.2. Oracle based\n\nOracle-based feeds are more flexible and operate on a request-response model, enabling dApps to query specific data on demand. Feæder utilizes Æternity’s native oracle system, a unique feature that enhances efficiency and security by integrating oracle capabilities directly into the blockchain layer.\n\n**Use Cases for Oracle-Based Feeds**:\n\n- Weather Insurance: Querying weather data for automated claim settlements.\n- Supply Chain: Accessing shipment tracking data for logistics dApps.\n- Community Voting: Fetching poll results or proposals for on-chain governance.\n\n#### 2. VRF\n\nSecure randomness is critical for applications like gaming, lotteries, and governance. Feæder integrates Drand (Distributed Randomness Beacon) to provide decentralized, tamper-proof randomness.\n\n###### 2.1. Why Drand?\nDrand is an open, distributed randomness beacon network that generates cryptographically secure random numbers. It is designed to be:\n\n- **Decentralized**: Drand randomness is generated by a group of independent nodes in a distributed network, ensuring trustlessness.\n- **Verifiable**: Generated randomness is publicly verifiable, enabling transparent use in dApps.\n- **Unbiased and Tamper-Proof**: The randomness is immune to manipulation, ensuring fairness.\n\n**Use Cases:**\n\n- Gaming: Generating random outcomes for loot distributions or match-making systems.\n- Lotteries: Securely drawing winners in a transparent manner.\n- Governance: Random selection of participants for voting or committee roles.\n\n## C. Technical \nFeæder is built with a robust and modern tech stack to ensure seamless performance and integration: \n\n1. **Frontend**: \n We used **Vue.js** to create an intuitive and user-friendly interface. This frontend allows developers integrating Feæder to: \n - Manage their subscriptions. \n - Access detailed information about data aggregators. \n - Explore the implementation of VRF (Verifiable Random Function). \n\n2. **Execution Backend Layer**: \n - **NestJS**: Powers the backend, featuring periodic workers for efficient task management using **Redis Cache**. \n - **Drand VRF Client**: Integrated to generate decentralized, tamper-proof randomness for use cases like gaming, lotteries, and governance. \n\n3. **Light Client Backend**: \n Built with **Elixir**, this backend layer connects to the Æternity middleware via **WebSocket**. It listens for on-chain contract events and relays them to the execution backend for processing. \n\n4. **Smart Contracts**:\n- Validating and storing data on-chain to ensure the integrity of data sourced from off-chain systems.\n- Acting as a security layer between off-chain data providers and destination smart contracts, preventing tampering or unauthorized access during the data transmission process.\n\n## D. What’s next?\n#### 1. Functions\nEnable smart contracts to interact seamlessly with off-chain data by sending requests to any REST API using GET or POST methods. These responses are then brought on-chain, empowering smart contracts with dynamic and real-world data integrations.","teamDescription":"Arogundade Ibrahim - Web3 Software Developer","githubPage":"https://github.com/devarogundade/feaeder","githubVerify":0,"demoLink":"https://testnet.feaeder.xyz/","demoVideo":"https://www.youtube.com/watch?v=gVMhCsbXJLg","ownerTitle":null,"ownerIntroduction":null,"twitterVerified":false,"weibo":null,"nft":null,"scOwner":"","editTime":1734352013,"upvotes":"0.00","isRecruitingEnabled":false,"recruitingInfo":"","recruitingLink":null,"twitter":null,"facebook":null,"instagram":null,"socialTelegram":null,"socialDiscord":null,"socialLinks":["https://x.com/feaeder","https://docs.feaeder.xyz"],"showedFunding":false,"agentStatus":null,"createdAt":"2024-11-11T05:43:48.779637+08:00","updatedAt":"2024-12-12T12:53:34.970400+08:00","milestoneEditor":null,"path":"/buidl/19578","techField":"","techFieldAry":[],"techTree":[0],"tags":[71],"otherTags":[],"origin":"-","intro":"## A. Introduction \nIn the rapidly evolving blockchain ecosystem, the need for reliable access to external data and secure randomness is more critical than ever. Smart contracts, though powerful, are inherently isolated from the real world. This limitation creates challenges for decentralized applications (dApps) that require real-time information or randomness to function effectively.\n\nFeæder is a decentralized oracle network built on the Æternity blockchain, designed to bridge this gap. By delivering real-world data and secure randomness to smart contracts, Feæder empowers developers to build robust, feature-rich, and trustless dApps. Whether it’s real-time token prices, sports scores, weather data, or fair randomness for gaming and governance.\n\n#### Subscription\nFeæder offers a subscription system that simplifies the funding and management of multiple consuming contracts. Users can create a subscription account, fund it with Æternity's native token, and link multiple consuming contracts. When these contracts request data, the transaction costs are calculated after the requests are fulfilled, and the subscription balance is deducted accordingly. This centralized funding model ensures efficient resource allocation and streamlined operations for dApps needing frequent or large-scale data requests.\n\n## B. Our Solutions \n#### 1. Data feeds\n\nData feeds provide decentralized applications (dApps) with reliable and real-time access to external information, bridging the gap between the blockchain and the real world. Feæder offers two types of data feeds, each serving distinct use cases:\n\n###### 1.1. Push based\n\nPush-based feeds continuously update smart contracts with real-time data. This approach is ideal for scenarios requiring low-latency data delivery, such as:\n\n- **Decentralized Finance (DeFi)**: Updating token prices for automated market makers (AMMs) or lending platforms.\n\n- **Sports Applications**: Delivering live scores or game stats for prediction markets and fantasy sports.\n\nFeæder aggregates, verifies, and streams data directly to Æternity-based smart contracts, ensuring data consistency and accuracy.\n\n###### 1.2. Oracle based\n\nOracle-based feeds are more flexible and operate on a request-response model, enabling dApps to query specific data on demand. Feæder utilizes Æternity’s native oracle system, a unique feature that enhances efficiency and security by integrating oracle capabilities directly into the blockchain layer.\n\n**Use Cases for Oracle-Based Feeds**:\n\n- Weather Insurance: Querying weather data for automated claim settlements.\n- Supply Chain: Accessing shipment tracking data for logistics dApps.\n- Community Voting: Fetching poll results or proposals for on-chain governance.\n\n#### 2. VRF\n\nSecure randomness is critical for applications like gaming, lotteries, and governance. Feæder integrates Drand (Distributed Randomness Beacon) to provide decentralized, tamper-proof randomness.\n\n###### 2.1. Why Drand?\nDrand is an open, distributed randomness beacon network that generates cryptographically secure random numbers. It is designed to be:\n\n- **Decentralized**: Drand randomness is generated by a group of independent nodes in a distributed network, ensuring trustlessness.\n- **Verifiable**: Generated randomness is publicly verifiable, enabling transparent use in dApps.\n- **Unbiased and Tamper-Proof**: The randomness is immune to manipulation, ensuring fairness.\n\n**Use Cases:**\n\n- Gaming: Generating random outcomes for loot distributions or match-making systems.\n- Lotteries: Securely drawing winners in a transparent manner.\n- Governance: Random selection of participants for voting or committee roles.\n\n## C. Technical \nFeæder is built with a robust and modern tech stack to ensure seamless performance and integration: \n\n1. **Frontend**: \n We used **Vue.js** to create an intuitive and user-friendly interface. This frontend allows developers integrating Feæder to: \n - Manage their subscriptions. \n - Access detailed information about data aggregators. \n - Explore the implementation of VRF (Verifiable Random Function). \n\n2. **Execution Backend Layer**: \n - **NestJS**: Powers the backend, featuring periodic workers for efficient task management using **Redis Cache**. \n - **Drand VRF Client**: Integrated to generate decentralized, tamper-proof randomness for use cases like gaming, lotteries, and governance. \n\n3. **Light Client Backend**: \n Built with **Elixir**, this backend layer connects to the Æternity middleware via **WebSocket**. It listens for on-chain contract events and relays them to the execution backend for processing. \n\n4. **Smart Contracts**:\n- Validating and storing data on-chain to ensure the integrity of data sourced from off-chain systems.\n- Acting as a security layer between off-chain data providers and destination smart contracts, preventing tampering or unauthorized access during the data transmission process.\n\n## D. What’s next?\n#### 1. Functions\nEnable smart contracts to interact seamlessly with off-chain data by sending requests to any REST API using GET or POST methods. 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