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Blockchain is a distributed register that is used to maintain a continuously growing list of records, called blocks. It has revolutionary applications in finance (such as cryptocurrencies like Bitcoin) and decentralized applications like online voting.

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    59 trabajados encontrados, precios en USD

    Szukamy osób do zespołu programistów na stałe zlecenie ok 12 miesięcy, na czas budowy platformy crowdfundingowej. Osoby które zgrają się z zespołem i będą lojalne wobec firmy otrzymają propozycję stałej pracy na obopólnie ustalonych dogodnych warunkach. Osoby posiadające doświadczenie z zakresu: - AI - Blockchain - Front End Dev - Back End Dev - UI/UX/Projektowanie graficzne - Budowa kompleksowa platform społecznościowych - Zarządzanie zespołem developerskim - iOS/ Android Apps Budujemy obecnie zespół, prowadzimy rozmowy indywidualne. Szukamy osób które zaangażują się w projekt platformy od a-z i będą jej częścią. Po zrealizowaniu platformy dla osób chcących zostać w zespole na stałe przewidujemy częściowe udziały. Wynagrodzenia za...

    $26 / hr (Avg Bid)
    $26 / hr Oferta promedio
    3 ofertas
    Tableau/PowerBI + Blockchain 6 días left
    VERIFICADO

    Hi, I am looking for developer with experience of Tableau or PowerBI implementation. Xero, Blockchain experience would be a plus. More details through chat.

    $490 (Avg Bid)
    $490 Oferta promedio
    16 ofertas
    Trading/Frontrunning Bot -- 2 5 días left
    VERIFICADO

    I recently had a Metamask trading bot coded that has been found to be malicious. The bot would accept deposits, function properly, but not withdraw. I've already lost quite a bit to this scam. This story only gets worse so I'll keep those details to myself but if you're interested, I will share. This project has a very short timeframe because just because we were scammed doesn't mean creditors understand the situation. My family and I need someone to be our white knight or white hat hero - whatever you want to call it. I am looking for someone who can make, from scratch, a front running, arbitrage, or other passive income bot that can help us while I recover, find a new job, and try to recover our stolen savings. The key part is that I want you to create for me wha...

    $2687 (Avg Bid)
    $2687 Oferta promedio
    6 ofertas
    Tableau or PowerBI 5 días left
    VERIFICADO

    Hi, I am looking for developer with experience of Tableau or PowerBI implementation. Xero, Blockchain experience would be a plus. More details through chat.

    $471 (Avg Bid)
    $471 Oferta promedio
    29 ofertas

    You must be an expert with , Typescript and blockchain. If not, don't bid. Create a simple landing page using NextJs, Typescript, Tailwindcss and Web3. The figma link is as follows: The goal is To: Connect your wallet to either Metamask, Coinbase or Trustwallet and show the connected address Replicate the UI as seen on figma, and make it responsive Use the stack mentioned above Host on any hosting platform and reply with the url… vercel is recommended This must be finished in 36 hours from now. This figma file is only 7% of the whole project. What are we looking out for: Clean typed code Good folder structure Attention to details Speed We will check your code in detail

    $128 (Avg Bid)
    $128 Oferta promedio
    27 ofertas

    We are looking for a developer to create a Smart Staking Token based on TRC-20. The developer should be familiar with TRC-20, Tokennomics, and Web Wallet Integration to create a functional and economically sound token. The token's total supply will be 54cr, divided among public offerings, dividends, referral awards, management funds, airdrops, etc. This will be hard-coded into the decentralized smart contract. There is a lot more which is impossible to discuss in this job post. The developer should have a good understanding of the cryptocurrency landscape and be able to provide insights into the token design. The candidate should also be familiar with cryptocurrency exchanges/ The successful applicant will work closely with our team to develop a professional website and whitepaper...

    $331 (Avg Bid)
    $331 Oferta promedio
    15 ofertas

    need a content writer having experience in ICO content writing and can provide a good articles with perfect flow of writing.

    $20 (Avg Bid)
    $20 Oferta promedio
    14 ofertas

    I’m looking for a web designer and developer that can handle the building and deployment of a large scale. Basically, it would consist of a few web3 elements so if you are that would be a huge boost in your bid to secure this project.

    $14540 (Avg Bid)
    $14540 Oferta promedio
    54 ofertas

    Blockchain Website & App Expert require for Payment Exchange and own Payment Gateway - Platform Require Like Stripe and PayPal + with multiple options for Accepting payments and Sending payouts globally. Website & App Design Responsive Website & App Development (Flutter or React Native) Modern Design, Extra Smooth Transitions & 3d Look Money Exchange. Wallet - Account, Transactions, Card, etc. Payment Gateway. (API, SDK & Plugins) Panels/Dashboard Full Website & App Control - Admin Panel & Staff Panel Website, App, Admin & APIs, SDK, Plugins Complete Documentation and 6 month complete Support -- Users can credit payments to their website account (from any source) -- Users can withdraw payments to any required accounts (banks, cards...

    $2161 (Avg Bid)
    Destacado Acuerdo de Confidencialidad
    $2161 Oferta promedio
    15 ofertas

    Please take a look at the demo on the following page: Connecting a phantom wallet (with some test USDC on Devnet), selecting 1 Box, and clicking on "Checkout" will redirect to the following url: If I decide to append some variables and load up the following url instead: I'd like to be able to grab the url variables and to make them available for use within the file. Then, I'd like you to simply encode/encrypt the "box-of-cookies=1&basket-of-cookies=0&city=Paris&country=France" string so that the url could be loaded as follows: or as and then the encrypted variables should be decoded/decrypted and made available for use within So I would have the option to load either the standard url or encoded/encrypted url and in both cases the...

    $32 (Avg Bid)
    $32 Oferta promedio
    9 ofertas
    Crypto currency 5 días left

    I need help making an crypto currency coin, I will pay extra if you help with marketing as well.

    $769 (Avg Bid)
    $769 Oferta promedio
    36 ofertas
    Blockchain script 5 días left
    VERIFICADO

    Im looking for a developer that can build me script.

    $190 (Avg Bid)
    $190 Oferta promedio
    58 ofertas
    Crypto mining app -- 2 4 días left
    VERIFICADO

    I need a crypto mining app like pi Needs to mine my tokens and then redeem them from my site. Must play ads. Allow people to invite people Have push notifications track invites Have a 24 hour timer to have to mine again. Have back end so I can see database of subscribers.

    $30 - $250
    Sellado
    $30 - $250
    21 ofertas
    Build me Arbitrage Crypto Bot 4 días left
    VERIFICADO

    Hi I am a Crypto trader. I am looking for someone to build me an Arbritage Crypto Bot. I would not be paying for any anything outside of Freelancer all payments will go through here. If you can help please kindly let me know.

    $1608 (Avg Bid)
    $1608 Oferta promedio
    76 ofertas
    Trading/Frontrunning Bot 4 días left
    VERIFICADO

    I recently had a Metamask trading bot coded that has been found to be malicious. The bot would accept deposits, function properly, but not withdraw. I've already lost quite a bit to this scam. This story only gets worse so I'll keep those details to myself but if you're interested, I will share. This project has a very short timeframe because just because we were scammed doesn't mean creditors understand the situation. My family and I need someone to be our white knight or white hat hero - whatever you want to call it. I am looking for someone who can make, from scratch, a front running, arbitrage, or other passive income bot that can help us while I recover, find a new job, and try to recover our stolen savings. The key part is that I want you to create for me wha...

    $469 (Avg Bid)
    $469 Oferta promedio
    28 ofertas

    We want to see what options are available for transferring our coffee loyalty program currently used at our cafe using physical cards, to a blockchain system. We understand that this may not be the typical use of the blockchain but we intend to start small and build upon it later.

    $956 (Avg Bid)
    Acuerdo de Confidencialidad
    $956 Oferta promedio
    47 ofertas
    Cafe Loyalty program on blockchain 4 días left
    VERIFICADO

    We want to see what options are available for transferring our coffee loyalty program currently used at our cafe using physical cards, to a blockchain system. We understand that this may not be the typical use of the blockchain but we intend to start small and build upon it later.

    $824 (Avg Bid)
    $824 Oferta promedio
    81 ofertas

    Need Fractional NFT market place based on ERC 1155 - NFT minting function (owner only) - Each NFT can connect to uniswap pool - User dashboard

    $628 (Avg Bid)
    $628 Oferta promedio
    26 ofertas
    NFT market place 4 días left

    we need a simple Fractional NFT project based on 1155 erc - NFT minting - Each NFT can connect to uniswap pool - user dashboard

    $633 (Avg Bid)
    $633 Oferta promedio
    27 ofertas

    Must have: Swift Xcdoe coding capability Blockchain/web3/walletconnect metamask integration knowledge App: We need to use an API/SDK like () and build a scanning mobile application. Also need NFT marketplace. User can capture image and make NFT. Need capable team with previous blockchain projects.

    $17313 (Avg Bid)
    $17313 Oferta promedio
    43 ofertas
    BLock Chain Coding 4 días left
    VERIFICADO

    Requirement is to write Solidity code to exploit a vulnerable smart contract, using the Goerli Testnet in Ethereum. This is not real Crypto coin. More details in chat

    $124 (Avg Bid)
    $124 Oferta promedio
    14 ofertas
    Crypto casino 4 días left
    VERIFICADO

    Looking for a crypto casino that someone has already built. Must be online and able to play against each other for tokens and have at least one slot machine.

    $250 - $750
    Sellado
    $250 - $750
    52 ofertas

    We are looking for a developer / a team of developer to develop a mini games platform. for both website and apps (android / iOS) Example : Web-based : Android Version : A platform where alot of people / user can submit their mini games, and user can play in several mode (duel, war, challenge, etc) and user can earn points / coins. We also would like to have a referral system in the platform.

    $4320 (Avg Bid)
    $4320 Oferta promedio
    28 ofertas

    Make a blank flat land metaverse with parcels for sale, online, with a mini map and people running around it. People will be able to buy their parcels and upload what they want in their space. Get this done in and smart contracts. You must be able to import the metaverse property from some source. Build a parcel place with 44,000 spots On a flat board with a mini map and a person able to run around it and see each square for sale. The map can be blank like a net and the people that run around can be imported from ready player me And the land connects to Metamask and takes BNB and ETH. Must be able to see each other online. If you can do this we will spend a lot more on the actual building out of the system. If you cant do this simple task within 250 to 300 dollars dont apply. ...

    $250 - $750
    Sellado
    $250 - $750
    24 ofertas

    Looking for 1-2 Senior Solidity Developers, can be part-time (10-20 hrs a week) or full-time: Requirements: * Familiarity with Test-Driven Development. * Have experience developing well-designed REST APIs. * Understanding of Blockchain architectural design patterns as well as supporting infrastructure. * Expertise in providing end-to-end solutions (Life Cycle for infrastructure including SDLC). * Knowledge of ERC20, ERC721, and other protocols. * In-depth knowledge of blockchain logic. * Understanding of fundamental encryption mechanisms. * Experience in peer-to-peer networking. * Understanding of Smart Contracts and consensus techniques, as well as experience developing blockchain apps or proofs-of-concept (POCs) in Solidity on Ethereum. * Hands-on development expertise in the following ...

    $36 / hr (Avg Bid)
    $36 / hr Oferta promedio
    64 ofertas

    I'm attaching a text file of the complete requirements of the project. I need an api based solution so that I should be able to use the code only with the api keys of my Binance account.

    $918 - $1836
    Destacado Sellado
    $918 - $1836
    13 ofertas
    Wordpress developer -- 2 3 días left
    VERIFICADO

    We have a Wordpress theme - needed to be customize.

    $128 (Avg Bid)
    $128 Oferta promedio
    212 ofertas

    I want to know if you can help me with one thing. I am a professional bettor and I have a Betting Tipster service in Football (Soccer). I want to know if is possible to create a Smart Contract with my bets and link to Decentralized Betting Bookies? For example all the costumers send the money to the one wallet and that wallet will manage the money and betting according to the strategy. And the profit will be shared to all the accounts according to the time that we define.

    $590 (Avg Bid)
    $590 Oferta promedio
    39 ofertas

    Hi I am looking for a blockchain & frontend engineer can build nft tile map with React. If you have experience, don't hesitate to apply. I will hire you immediately and we can work further. Kind regards

    $1174 (Avg Bid)
    $1174 Oferta promedio
    104 ofertas
    NFT project 3 días left

    I need someone who can help me fixing some issues with a nft project

    $560 (Avg Bid)
    $560 Oferta promedio
    54 ofertas

    Hello dear freelancer, I need your aid with an issue I'm facing with digital currencies

    $509 (Avg Bid)
    $509 Oferta promedio
    52 ofertas

    Here is my platform, I am going to update it with new code and work as well Also going to integrate some platforms on my bridge

    $57 (Avg Bid)
    $57 Oferta promedio
    8 ofertas

    Make a blank flat land metaverse with parcels for sale, online, with a mini map and people running around it. People will be able to buy their parcels and upload what they want in their space. Get this done in and smart contracts. You must be able to import the metaverse property from some source. Build a parcel place with 44,000 spots On a flat board with a mini map and a person able to run around it and see each square for sale. The map can be blank like a net and the people that run around can be imported from ready player me And the land connects to Metamask and takes BNB and ETH. Must be able to see each other online. If you can do this we will spend a lot more on the actual building out of the system. If you cant do this simple task within 250 to 300 dollars dont apply. ...

    $250 - $750
    Sellado
    $250 - $750
    22 ofertas

    patrick video code provided on github you have to extend that nft marketplace with e voting feature on assets owned by multiple accounts . and biding system on that on a goerli testnet network.

    $12 (Avg Bid)
    $12 Oferta promedio
    2 ofertas

    Modules User Candidate Finger print Blockchain technology has already been hailed as a way to support the need for trust between transactions in an electronic information system. The issues of helpless anonymity and low competency associated with traditional democracy have been partially addressed by electronic democracy. Digital democracy. We cannot ignore the difficulties it creates in monitoring the vote-counting procedures or the fact that it calls for the presence of a trustworthy third party. Due to its decentralization, anonymity, and non-tampering capabilities, blockchain technology has recently emerged as a more viable alternative to electronic voting. In this study, we suggest an online voting system based on the Blockchain. We can vote using a mobile device from anywhere...

    $125 (Avg Bid)
    $125 Oferta promedio
    9 ofertas
    Blockchain/DAO 1 día left

    Community focused blockchain/Web3 incubator in fashion. Work involves DAO front end, smart contract based blockchain development, and innovative web3 models.

    $2382 (Avg Bid)
    $2382 Oferta promedio
    83 ofertas

    Hello - I'm looking to build a non-custodial (self-custody), multi-chain, wallet with on/off ramp for fiat. I'd also like an integrated DEX/exchange/swap feature where we will charge a transaction fee (not sure if I would need to set up a separate treasury function to collect and store these fees, etc?). Happy to hear suggestions on collecting fees. Also, I'd like this wallet to be able to connect to other Dapps/protocols as well (not sure if this would need to be integrated with existing tech to do so, ie, WalletConnect or something similar?) I'd like this multi-chain, as many chains to begin with - happy to take your advice here. My plan would be to start somewhere and build this out over time. Longer term plan would be to build out a "Pro" version for inst...

    $36 / hr (Avg Bid)
    $36 / hr Oferta promedio
    37 ofertas

    This project is not based on EVM and solidity so don't pitch me that . A nodejs developer with knowledge on blockchain technology can do this job , so write NODEJS WITH STEEM in your bid so i will check it I want a opensource project made on nodejs and mongo db to modify and operate as per my requirements more to be discussed later thanks

    $164 (Avg Bid)
    $164 Oferta promedio
    55 ofertas
    Auto trading bot 1 día left
    VERIFICADO

    I need a pancakeswap and uniswap trading bot. Contact me ONLY if you can deliver effectively.

    $292 (Avg Bid)
    $292 Oferta promedio
    26 ofertas

    Pharma supply chain optimization with Ethereum Virtual Machine Nodejs for backend, Solidity for smart contract and Reactjs for frontend

    $834 (Avg Bid)
    $834 Oferta promedio
    59 ofertas

    PHASE 1: Cryptocurrency Short Selling Protocol w/ or w/o Counterparty and basic Ui, for personal DEX trading Options: 1. Add “short selling” functionality to 1inch swap or similar 2. Create short selling pool w/ bonding curve or live price discovery PHASE 2: after live testing, Finish public Ui Short selling page.

    $1179 (Avg Bid)
    $1179 Oferta promedio
    104 ofertas

    This project is to build up a MPC wallet on Near protocol. It has following requirements: 1. Provide wallet apis for client to call, including create wallet, recover wallet, send, receive, execute transaction, sign transactions, show NFTs, show tokens in wallet, show recent transactions activities 2. Wallet creation and recovery should be based on email instead of seed phrase because MPC adoption 3. Wallet should use Threshold Signature Scheme approach 4. Wallet should be based on Near Protocol 5. You should use existing MPC service in the market. Fireblock is recommended, but feel free to suggest other service too. 6. No UI needed but every api should be testable and well tested

    $2784 (Avg Bid)
    $2784 Oferta promedio
    33 ofertas

    Im trying to understand the current market sentiments about play2earn platforms, specifically around user motivation. If you have played AxieInfinity/ other similar games before, would love to hop on a 30 minutes paid survey call.

    $25 (Avg Bid)
    $25 Oferta promedio
    9 ofertas
    Crypto mining app 15 horas left
    VERIFICADO

    I need a crypto mining app like pi Needs to mine my tokens and then redeem them from my site. Must play ads. Allow people to invite people Have push notifications track invites Have a 24 hour timer to have to mine again. Have back end so I can see database of subscribers.

    $30 - $250
    Sellado
    $30 - $250
    30 ofertas

    Chcemy stworzyć własną kreptowalute na kodzie ETH bądź innym.

    $2375 (Avg Bid)
    $2375 Oferta promedio
    12 ofertas

    I need a blockchain developer especially game. So good idea is necessary first. If you have many experiences about Cosmos blockchain please bid. =============== If you don't have any Github repositories you shouldn't bid. Good idea hiring instantly.

    $2539 (Avg Bid)
    $2539 Oferta promedio
    42 ofertas
    Build a USDT trading website 12 horas left
    VERIFICADO

    Looking for an expert blockchain developer who can build the web application to trade USDT by interacting with Networks directly.

    $578 (Avg Bid)
    $578 Oferta promedio
    34 ofertas
    Integrate new screens for dao 11 horas left
    VERIFICADO

    ETH chain two screens to integrate to a new design DAO is already working in eth chain. DAO token is LINK NOW, NEED TO CHANGE TO our token screens -

    $20 / hr (Avg Bid)
    $20 / hr Oferta promedio
    35 ofertas

    The project is to deploy Polygon (matic) Validator node and manage it. Contact for more information, Freelancers with Matic Validator Node experience only, companies will not be contacted. Do not waste time please.

    $197 (Avg Bid)
    $197 Oferta promedio
    29 ofertas

    Hi, I need to help finish the sf collection, as well as add character variations

    $24 / hr (Avg Bid)
    $24 / hr Oferta promedio
    44 ofertas