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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    74 работ(-а,-ы) найдено, цены указаны в USD
    Blockchain logisitics app 6 дней(-я) left
    ПОДТВЕРЖДЕН

    Using barcodes or qr codes to track items and include data such as weight, item in packaging, source location, destination etc etc.

    $7206 (Avg Bid)
    $7206 Ср. заявка
    35 заявок(-ки)
    Build a contract on LUNC (Terra Classic) Chain using RUST 6 дней(-я) left
    ПОДТВЕРЖДЕН

    Im looking for a developer who can build a utility contract on the LUNC (Terra Classic) Chain using RUST which can run autonomously on launch. The contract would need to allow queries to pull data for display on a website. The contract would need to be able to action transfers from one wallet to another within intervention. More information on the specifics of the utility will be supplied to the shortlist of developers. The developer must also be able to build the accompanying HTML site from a supplied design.

    $1435 (Avg Bid)
    $1435 Ср. заявка
    54 заявок(-ки)
    BLOCK CHAIN DEVELOPER 6 дней(-я) left

    I NEED A DEVELOPER WHO HAVE 4+ YEAR OF EXPERIENCE IN WRITING SMART CONTRACT. I NEED A SMART CONTRACT OF SWAPPING, USER WILL SWAP TOKEN WITH ANOTHER TOKEN. NEED AN INDIVIDUAL DEVELOPER WHO WILL WORK ON FIX AMOUNT. AVAILABLE TO START ASAP.

    $497 (Avg Bid)
    $497 Ср. заявка
    57 заявок(-ки)
    NFT Website Upgrading Including Smart Contract 6 дней(-я) left
    ПОДТВЕРЖДЕН

    I have local nft project is working now. But I want to upgrade and add more functions. I need dev who is very experienced in blockchain and nft marketplace. Dev should help me with upgrading and fixing bug. Please start bidding with "NFT"

    $149 (Avg Bid)
    $149 Ср. заявка
    23 заявок(-ки)
    Create NFT Marketplace -- 2 6 дней(-я) left
    ПОДТВЕРЖДЕН

    Create NFT Marketplace for ETH and Solana

    $860 (Avg Bid)
    $860 Ср. заявка
    59 заявок(-ки)
    unity bug error multi player -- 3 6 дней(-я) left
    ПОДТВЕРЖДЕН

    unity multipplayer with avatar load all ready code package 2 error come slow that

    $85 (Avg Bid)
    $85 Ср. заявка
    1 заявок(-ки)

    We wanted to build a System that Recognizes Whether the person is a Criminal Or not to Secure the data we will implement this database in the Blockchain so that database is not centralized. We will also make a frontend to where User can interact easily and can check whether the Person is a Criminal or not

    $352 (Avg Bid)
    $352 Ср. заявка
    4 заявок(-ки)

    Implement service that gets information about all pairs from Uniswap and calculate route for a swap between any two pairs, even for those that don't have 1 <-> 1 path. For example, let's say we want to swap ETH to LINK, our path may look like: ETH -> USDC -> LINK Make sure that route is most optimal (including current asset prices + transaction fees). Create GQL server that will provide an interface for your API.

    $443 (Avg Bid)
    $443 Ср. заявка
    30 заявок(-ки)
    blockchain multi-vendor website REPOSTED 5 дней(-я) left
    ПОДТВЕРЖДЕН

    Hello, I want a website similar to Amazon. But that the payment is made through cryptocurrencies and other functions that I will comment on privately. I want the crypto to go to the website wallet first and then when the buyer accepts the service as received, the money will automatically go to the seller's wallet. There are no ethereum contracts as we don't want to be saddled with their huge gas fees. Only experienced people, no wordpress, don't waste my time. If the project is carried out well, there is a high possibility that they will be hired again for a much higher salary for a long period of time. Please put this word at the beginning of your message to ensure you have completely read the project description: "Wallipal"

    $1177 (Avg Bid)
    $1177 Ср. заявка
    80 заявок(-ки)
    Create Sales Page And Demos 5 дней(-я) left
    ПОДТВЕРЖДЕН

    For our project we need an IGO/INO and NFT Marketplace demo and Token Sale Page. Create Original NFT Market, INO/IGO platform demo for our project. (like ) -Demo It should be designed for active use in the coming days. Create a token sale page. Create a Sales Page with Private Sale and Farilaunch afterwards. -All Collected Coins will be displayed on the sales page -Listing price will be shown as 10% higher than launchpad's final price -Create Infrastructure for Claiming Tokens after the sale.

    $657 (Avg Bid)
    $657 Ср. заявка
    36 заявок(-ки)
    Upgrade A blockchain Bot Etherium Blockchain 5 дней(-я) left
    ПОДТВЕРЖДЕН

    I have a Nodejs bot that is buying newly launched Tokens on Eth and BSC blockchains based on some set criteria. I need to add the following updates or features: 1) The bot MUST do all SELLS using the gas multiplier 2) Bot should restart if "sellThresholdFall" or "balanceCheckMultiplier" becomes true, or if the Bot Fails to Sell. 3) In Automagic, if useAuthorisedList = True, check "NoRug Endpoint" - a global Variable of Contracts, to see if the contract is on the list, only then buy it. 4) FIX needed = the % tracking is slow to update. Make it faster to track percentage gain. 5) If deadblock is true AND our Buy fails, the bot will listen for the first successful buy trade (from other traders), and sends a buy transaction. 6) If no activity (no buys or sells) f...

    $598 (Avg Bid)
    $598 Ср. заявка
    72 заявок(-ки)
    Blockchain research 5 дней(-я) left

    I need help doing research on blockchain (Bitcoin). Part of the payment will be in the form of Bitcoin funds as follows. For this you will need to have two wallets addresses (A and B) on Bitcoin blockchain, that you can share with me Here is the job description: - I will send funds to your wallet. - Will give you company name that accept Bitcoin (such as Binance, Coinbase etc) - You will register at this company yourself, providing your own information. - Obtain a new wallet address at that company (C) - Send fund from wallet A to wallet C at each company - Send funds from wallet C to wallet B. - Share with me wallet C address for each of these companies and transaction hashes for the performed transactions between wallets A, B and C.

    $141 (Avg Bid)
    $141 Ср. заявка
    15 заявок(-ки)
    EastGate Token 5 дней(-я) left

    I need someone to write and design a white paper for my newly created cryptocurrency token

    $115 (Avg Bid)
    $115 Ср. заявка
    31 заявок(-ки)
    Looking for MERN/Blockchain Expert -- 2 5 дней(-я) left
    ПОДТВЕРЖДЕН

    Hi All, I am looking for individual freelancer with having great experience with MERN/Blockchain. ONLY INDIVIDUAL FREELANCER T & C - 1. Monthly basis 2. 40 hours a week 3. Long term

    $838 (Avg Bid)
    $838 Ср. заявка
    23 заявок(-ки)

    Who are we: We're the fastest growing casino for video game items/currency with hundreds of thousands of unique users every week. We work in small teams with very little bureaucracy and we push for innovation and speed. You'll be working directly with the co-founder who is our CTO and is a senior-level Java engineer that will be able to guide you to ensure you succeed. Our site's frontend is in React and it's connected to our backend via Java rest APIs. Tech stack needed: -Experience with Java Spring Boot -Experience with Web3 and NFT We look forward to working with you!

    $22 / hr (Avg Bid)
    $22 / hr Ср. заявка
    46 заявок(-ки)

    Hello, Me and my team are looking to develop a unique casino game which accept bitcoin or eth payments - The website should have a very clean and a eye attracting UI/UX and should be user friendly - Fully automated Deposits & Withdrawals with bitcoin or eth - Integrated chat - Referral system Please message us if you are capable of doing something like this and for more information regarding the game we are building

    $808 (Avg Bid)
    $808 Ср. заявка
    31 заявок(-ки)

    Please must write the experience you have forked bridge and explorer with website links. I'll never chat anybody who can't share your prove of this experience. I'm looking for blockchain developer who can bridge and explorer quickly as well. Please share the experience of bridge and explorer fork. Don't apply if you don't have experience.

    $16 / hr (Avg Bid)
    $16 / hr Ср. заявка
    57 заявок(-ки)
    TRC20 Payment PHP 5 дней(-я) left
    ПОДТВЕРЖДЕН

    Hello, I want to receive TRC20 USDT payments on my php website 1. generate a new address on every new payment request. 2. run webhook on receiving the payment. 3. transfer received money to another address.

    $70 (Avg Bid)
    $70 Ср. заявка
    26 заявок(-ки)
    Creator of the NFT 5 дней(-я) left

    Need to develop 10 kinds of animated NFTs about the game. NFTs of 5 kinds of characters and 5 kinds of inventory. The game is set in a fantasy world reminiscent of the world of Middle-earth from Tolkien's famous works.

    $2300 (Avg Bid)
    $2300 Ср. заявка
    57 заявок(-ки)
    Blockchain dev to fix Tron and ETH node sync issues 5 дней(-я) left
    ПОДТВЕРЖДЕН

    Problem in Node Sync ...Tron Block stuck {"timeStamp":1664197398000,"triggerName":"contractEventTrigger","uniqueId":"2515e08a21213c1c12f3c9d751faeaa7c8b16b5b5acbfe93d9b9c0d1ca519142_1","transactionId":"2515e08a21213c1c12f3c9d751faeaa7c8b16b5b5acbfe93d9b9c0d1ca519142","contractAddress":"TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t","callerAddress":"","originAddress":"TMaEb751S7ZjEL1fVyXnxR5PDjB9Lpxj9m","creatorAddress":"THPvaUhoh2Qn2y9THCZML3H815hhFhn5YC","blockNumber":44539219,"blockHash":"0000000002a79d53bbb363e28f1e91ff5e46c0d7a180f9474f2fedc72b789c98","removed":false,"latestSolidifiedBlockNumber":44...

    $14 / hr (Avg Bid)
    $14 / hr Ср. заявка
    5 заявок(-ки)
    Klever Blockchain Airdrop DAPP 5 дней(-я) left
    ПОДТВЕРЖДЕН

    We are looking for somebody to create a simple airdrop application to drop tokens to multiple user addresses on the Klever blockchain. Requirements: 1. Create and deploy Klever airdrop contract on Klever testnet 2. Create and deploy Klever token on testnet 3. Test that the contract works and that the tokens can be dropped to addresses. Note: The contract should be able to drop to multiple addresses at the same time. E.g., 10,000 addresses 4. Provide a live demonstration of the contract working on testnet 5. Create and deploy Klever airdrop contract on Klever mainnet 6. We will create a token on the Klever mainnet for it to be linked to the contract. 7. Provide detailed instructions and screenshots of how to use the contract Useful links: Klever SDK - Klever Testnet - Klever Testnet...

    $860 (Avg Bid)
    $860 Ср. заявка
    40 заявок(-ки)

    Hello! I 'm going to make staking or mining website. Developers with experience in this field, please contact us.

    $7877 (Avg Bid)
    $7877 Ср. заявка
    31 заявок(-ки)
    blockchain multi-vendor website 4 дней(-я) left
    ПОДТВЕРЖДЕН

    Hello, I want a website similar to Amazon. But that the payment is made through cryptocurrencies and other functions that I will comment on privately. I want the crypto to go to the website wallet first and then when the buyer accepts the service as received, the money will automatically go to the seller's wallet. There are no ethereum contracts as we don't want to be saddled with their huge gas fees. Only experienced people, no wordpress, don't waste my time. If the project is carried out well, there is a high possibility that they will be hired again for a much higher salary for a long period of time. Please put the word: "Wallipal" to ensure you have completely read the project description.

    $1646 (Avg Bid)
    $1646 Ср. заявка
    61 заявок(-ки)
    Discord and Twitter Community manager! NFT project 4 дней(-я) left
    ПОДТВЕРЖДЕН

    We are looking for CM for discord and Twitter, preferably with experience in NFTs, blockchain, web3, etc. projects.

    $209 (Avg Bid)
    $209 Ср. заявка
    26 заявок(-ки)
    Blockchain / Solidity Developer -- 2 4 дней(-я) left
    ПОДТВЕРЖДЕН

    Hi, I am looking for a Blockchain / solidity developer. Looking for a long-term working relationship. Regards

    $18 / hr (Avg Bid)
    $18 / hr Ср. заявка
    93 заявок(-ки)

    I have two smart contracts deployed in BSC network. One is smart contract with buyback function and the other is one for staking. I need to have detailed operational manuals for these smart contracts. I need to have detailed functions and operating manual with examples in word file. Attachment is original smart contract that I forked. You can describe me each function of read and write contract in BSCSCAN. Again, I need to learn how to operate these contracts. Second job is integration staking smart contract into Dapp. Both were created by Manual is at All design is ready to go and smart contract has been deployed in network. I need to integrate them and deploy it in my homepage. I need to learn how to handle this jobs so you need to work in my computer using teamviwer or Anydesk for s...

    $190 (Avg Bid)
    $190 Ср. заявка
    20 заявок(-ки)
    Need help in implementing wallet connect in react js 4 дней(-я) left
    ПОДТВЕРЖДЕН

    Need help in integrating wallet connect function in web app.

    $14 / hr (Avg Bid)
    $14 / hr Ср. заявка
    14 заявок(-ки)
    Blockchain Technology Trainer Needed 4 дней(-я) left
    ПОДТВЕРЖДЕН

    Trainer needed for training for students in Tamil Nadu . Travel allowance will be given .

    $130 (Avg Bid)
    $130 Ср. заявка
    3 заявок(-ки)

    We are looking for a web3 developer to help us add functionality to use self generated keys to interact with our smart contract and send transactions. Currently, users need to confirm each transaction using Metamask, however, we need to add this extra option for users to either use self generated key or still use the current functionality. Please only apply to this job if you understand the task at hand. Imoportant note: Please describe your recent experience with similar projects

    $196 (Avg Bid)
    $196 Ср. заявка
    27 заявок(-ки)
    Fork Sushiswap2.0 4 дней(-я) left

    Need to fork sushiswap2.0. I added diagram and you need to check it before apply. please start with checked image with your proposal.

    $1218 (Avg Bid)
    $1218 Ср. заявка
    28 заявок(-ки)
    Foin coin developer 4 дней(-я) left

    I want to build web site like fopay. I am finding developer who have deep experience of foin coin.

    $195 (Avg Bid)
    $195 Ср. заявка
    19 заявок(-ки)
    build a nft char 4 дней(-я) left
    ПОДТВЕРЖДЕН

    i need a nft for my project if you are a nft char developer ping

    $116 (Avg Bid)
    $116 Ср. заявка
    10 заявок(-ки)
    SmartLaunchpad 4 дней(-я) left

    SmartLaunchpad is the next generation decentralized IDO Launchpad and Incubation zone for DeFi, Gaming, Metaverse & NFT projects Built on Binance smart chain and Polygon Network.

    $340 (Avg Bid)
    $340 Ср. заявка
    14 заявок(-ки)

    I want to build a web3 platform for users to claim or buy my new token like yhis project.

    $234 (Avg Bid)
    $234 Ср. заявка
    22 заявок(-ки)
    Nft blockchain project 3 дней(-я) left

    People should able to connect the metamask and mint nfts, not a wordpress site…

    $429 (Avg Bid)
    $429 Ср. заявка
    80 заявок(-ки)
    I need an Android expert who will with PhP codigineter backend 3 дней(-я) left
    ПОДТВЕРЖДЕН

    My app is uber type with investment option, i want to reposition the place that some icon be, add crypto upload it back to playstore

    $22 / hr (Avg Bid)
    $22 / hr Ср. заявка
    86 заявок(-ки)
    Create python tool Multi Sender BSC wallet project 3 дней(-я) left
    ПОДТВЕРЖДЕН

    Hello, I need a tool that can send bulk in many wallets in BEP20 (BSC) network. I think the tool will be like this: I have to put in a txt file all wallets in bsc that I need to send. I have to put somewhere the private key of the wallet that I want to send. Set somewhere the contract address of the token. Set somewhere the amount that want to send with 2 options 1) Random set From and To amounts ( from 1000 to 10000 ) 2) Fixed set the exact amount ( 5000 ) If there is no enough amount in the wallet that send then show the according error. If there is no enough gas fee show the according error. This must be with interface ( GUI ). Also when you finish you have to send me the source code.

    $106 (Avg Bid)
    $106 Ср. заявка
    14 заявок(-ки)
    Implement Bitcoin Core and Ethereum full nodes -- 2 3 дней(-я) left
    ПОДТВЕРЖДЕН

    A developer with experience with implementing full nodes for monitoring and handling transactions is required. Experience with Bitcoin Core required Experience with Ethereum Full Nodes (Geth, etc) required

    $2496 (Avg Bid)
    $2496 Ср. заявка
    87 заявок(-ки)
    Crypto Betting and casinos for my already built token. 3 дней(-я) left
    ПОДТВЕРЖДЕН

    If you have betting sites and casinos already built that you can play with crypto, say I have one, ill then message you and then you send the links. if this does not happen I will ignore you. No third party sites where I have to pay other people to get in. If you want to become a partner we can do that as well.

    $250 - $750
    Скрытый
    $250 - $750
    39 заявок(-ки)
    php development 3 дней(-я) left

    Companies (do not bid). only individual developers can bid. I have a few php projects and I need help from a good developer who is not very busy and can assist me in completing them. you should be able to have calls and be engaged.

    $13 / hr (Avg Bid)
    $13 / hr Ср. заявка
    46 заявок(-ки)
    Create the NFT collection -- 2 3 дней(-я) left
    ПОДТВЕРЖДЕН

    Need to create a collection of NFT of 50 art, based on the game "Grit". You will need to integrate the arts into the game itself through a smart contract. As a basis, you can take collections of Crypto-Punk and BoredApe. Please read carefully and add "I am a NFT creater" to your bid. Regards

    $1112 (Avg Bid)
    $1112 Ср. заявка
    29 заявок(-ки)
    Create the NFT collection 3 дней(-я) left
    ПОДТВЕРЖДЕН

    Need to create a collection of NFT of 50 art, based on the game "Grit". You will need to integrate the arts into the game itself through a smart contract. As a basis, you can take collections of Crypto-Punk and BoredApe. Please read carefully and add "I am a NFT creater" to your bid. Regards

    $1251 (Avg Bid)
    $1251 Ср. заявка
    26 заявок(-ки)
    BLOCKCHAIN BITCOIN FLASHING SOFTWARE 3 дней(-я) left
    ПОДТВЕРЖДЕН

    We want the software to do the below stuff: It should generate Btc Fake Transaction(flash btc) with the below features: - -Defined the time that the transaction can remain in the wallet - -Defined the charges of the blockchain networks for a quick confirmation - -VPN and TOR options included with proxy - -Can check the blockchain address before transaction - -Transaction can get full confirmation - -Support all wallet - -Segwit and legacy address – -100% confirmed transaction - You can spend bitcoins easily on any other address (Segwit address, legacy, Segwit / bch32) - - it works with all wallets. - -Should be tradable like real btc. withdraw from exchange not necessary Can be transfarable wallet to wallet more then 5 times minimum previousr experience are preferred

    $99 (Avg Bid)
    $99 Ср. заявка
    5 заявок(-ки)
    Web3 website with a mini-game 3 дней(-я) left

    Hello, contact me for more details

    $658 (Avg Bid)
    $658 Ср. заявка
    35 заявок(-ки)
    Do token contract in kadena blockchain 3 дней(-я) left
    ПОДТВЕРЖДЕН

    Do token contract in kadena blockchain

    $235 (Avg Bid)
    $235 Ср. заявка
    24 заявок(-ки)
    Pancakeswap fork 2 дней(-я) left
    ПОДТВЕРЖДЕН

    Hello everyone, I want to fork pancakeswap site. If you have experience please bid. You Must Have Experience! Thanks

    $433 (Avg Bid)
    $433 Ср. заявка
    16 заявок(-ки)

    Looking for an experienced article writer in the blockchain industry who will write 4 articles per month about our project. Each article will be 800-1000 words long it will be contract based to pay per article. We need someone that is extremely passionate and the only way to know you are is by owning some crypto yourself, do you own some crypto or NFT?

    $1910 (Avg Bid)
    $1910 Ср. заявка
    40 заявок(-ки)
    Trophy icon Cryptocurrency trading strategy 2 дней(-я) left

    Hello, We have been running several cryptocurrency trading rules on the following platform: But we are looking to have new set of rules that work on ANY market conditions, thats why we are looking for the best performing strategy someone can come up with and the one that wins will win the contest. Please submit all rules under seal

    $2000 (Avg Bid)
    Избранный

    please this is a partner appeal, we need a very good expert in mobile java app developer and blockchain and php codigineter developer, the first work i wish to do is to modify our existing app by 1 making refer code work without hiting a separate icon, then 2 add new explain button for vidoe explanation,no 3 chat and registration fixing which all he need to do is to add the sha-key the reupload it on google playstore

    $206 (Avg Bid)
    $206 Ср. заявка
    32 заявок(-ки)

    I need a cryptanalyst who will tell me how to make my game better, what are the minuses and pluses in it. It also happens that the game does not start, this also needs to be fixed.

    $86 / hr (Avg Bid)
    $86 / hr Ср. заявка
    5 заявок(-ки)

    Топ-статьи сообщества Blockchain