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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    writing code for a cryptocurrency

    €41 (Avg Bid)
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    build a solidity/web3 script 6 dní left

    write nodeJS script that would retreive specific information from blockchain

    €391 (Avg Bid)
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    i have a python script IT requires cplex to run it . I want alternate open source software to run the script and edit script for that alternate software if required.

    €15 / hr (Avg Bid)
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    Setup Open sea clone script 6 dní left

    Setup Open sea script marketplace site

    €1213 (Avg Bid)
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    Blockchain Developer 6 dní left

    We are working on a startup project to build a professional network verified on the blockchain similar to and create a token just like they did here Let me know if you have built similar Dapps and tokens before. Also, check the reference site and let me know how that was created on the blockchain.

    €4458 (Avg Bid)
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    Hi I have developed smart contract (partially done) need someone to adjust it and then update the whole thing. please message me so I can send you what's done and you can assess real cost of project

    €390 (Avg Bid)
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    Solana Crypto Poker Site 6 dní left

    Looking for experienced developer who can build a multiplayer poker game for Solana (Phantom wallet). Must be capable of doing both front and back end for the project within reasonable time. Experience is not optional.

    €2586 (Avg Bid)
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    We want to make a network marketing plan where we have to use dApp like tronlink pro or trust wallet and metamask. Experienced developers needed.

    €322 (Avg Bid)
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    Crash Game For Solana -- 2 6 dní left

    Looking for full stack blockchain pro who can develop a game of Crash for me, you must have connections to design and build everything from A to Z, design and front end included. We have images/references of how we want it to look, but you must do the rest. We have open source Crash script too, time wasters will be ignored.

    €2623 (Avg Bid)
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    Looking for someone to edit a codecanyon script that currently supports metamask only, need it to support Phantom wallet (solana ecosystem) its made in react. please have experience.

    €538 (Avg Bid)
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    Bitcoin Flash Tutorial -- 3 6 dní left

    Just $1000 for 3 days! 1. checking softare quality $500 2. after push codebase $500. I need someone to teach me how to make a bitcoin flash transaction or give me the software for it . It means that you can send a fake bitcoin transaction to a wallet , it would not get validated like you cannot spend it , but it would get 1 or 2 confirmations , therefore showing it in your wallet . If you know how to do it and what I am talking about , please dm . DO NOT PROPOSE IF YOU DO NOT KNOW WHAT THIS IS ABOUT . I WANT PROOF FIRST .

    €1001 (Avg Bid)
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    Build a Website frontend 6 dní left

    Looking for a website developer to build a website front end. It will consist of a few pages and a few basic functions. In the future it will be used as the front end to connect to the ethereum blockchain and other blockchains/dapps. Initially though I am looking for more of a landing page to showcase the front end and what potential functions that this website will able to do. This is so i can attract interest in my project then down the timeline i can take the next step in making the front end connect with the back end. The website i want built will be a combination of and I will detail what content i want on the website. The buttons and links on the front end dont have to work yet as discussed above this is just a display website initially. You will need to understand blockcha...

    €405 (Avg Bid)
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    NFT minting bot on ETH network 6 dní left

    I need a minting flash, create one on the Javascript language. Mint NFTS automatically.

    €265 (Avg Bid)
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    Flutter Developers 6 dní left

    Looking for flutter developers to join our crypto team, all experience levels needed.

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    I need an React.Js & Truffle expert to set up and run following Github Project. Payment will be proceed after I have checked screenshots or video of this project running. No coding, just run this project on windows os. Project Link :

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    Bitcoin / Other Crypto Mining 6 dní left

    Looking for an expert in development unique crypto mining platforms that allows for optimal profitability / energy efficiency with the project timing to be as quickly as feasibly possible The project will be discussed in more detailed with the freelancer.

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    I am looking for someone to create a Tip Feature for Twitter similar to for my Crypto tokens that have been created on the Songbird Network

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    I want an arbitrage bot. Have you done arbitrage bot?

    €578 (Avg Bid)
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    Blockchain Developer for Games 5 dní left

    Hi I am developing a game on block chain. Need a very experienced blockchain developer for back end integration on Binance or ethereum

    €858 (Avg Bid)
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    need a dev who can edit the python script of arbitrage bot on cex . and add feature like checking withdrawals and deposits on signal exchagnes if they are on or not and execute the trade if they are on

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    EDIT a python code for a crypto bot + make a back end

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    I basically need someone to build a python script or fix an existing one that can transfer tron (TRC20) tokens. Thanks.

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    Hi, I'm Looking For Crypto Exchange Development With App IOS & Android As Well Desktop App For MacOS , Windows , Linux Kindly Send Me Quote Of This Project Expert Team Need

    €2948 (Avg Bid)
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    We are going to develop Betting project using NFT price. They have to have full experience with smart contract, chainlink oracle.

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    What I'm looking for: An experienced ReactJS developer to help fixing bugs of DEX. You'll work on the issues of the Github repo. The right developer will have experience in the following: - Familiar with and blockchain - Clean code - Don't upload the project on the public repo. - Honest timeline of the actual work - Using Github issues - Using Clockify for tracking time - Available 9:30-4:30 EST - Slack communication - $15-$17/hr I'm a developer, so I know how much time each issue take. If you're going to log more time than your actual work time, don't apply this position. This is a full time work. If you're honest on the timeline of your work, you'll get endless tasks. This is a full time work. If you're honest on the timeline...

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    1. Need DevOps consultant with experience in AWS services 2. Expertise required on deployment and configuration of AWS API gateway, developing and deploying AWS Lambda function, deployment and configuration of docker containers on AWS EC2 3. Any experience with blockchain is a plus

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    We have built a music NFT marketplace on the BSC Looking for someone who can add features and refine some front end. Like do collections Having people invest in music So do some smart contracts Make muzix multichain Add extra roles on platform and some ux

    €22 / hr (Avg Bid)
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    Crypto Flashing bot 4 dní left

    If anyone knows how to create any crypto Flashing Bot. Please let me know your offer.

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    Need 2-4 pages of roadmap (technical guideline) to develop a purely phone-based blockchain network similar as pi network.: 1. Solution to build a new blockchain, or using existing blockchain, to create a new system/community/cryptocurrency. 2. Similar to Pi Networking, that is purely based on phone users, and based on phone mining. (so, basically, not PoW or PoS based chain). 3. Should be able to let all users to vote for certain issues, and be able to change the block data under majority user's agreement (For example, A's account has been stolen by user B. Under majority user's agreement by vote, the system can change the block data, and make A's stolen currency back from B). The guideline should be clearly state the solution and answers for following: what's th...

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    Rust backend developer 4 dní left

    Hello please write me via chat Namely I need to develop thread pool for application with code THREAD

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    Our project has some success with NFTs (Ethereum). We have ERC721a NFTs that were minted, they generate ERC20 currency tokens, this combines to breed an ERC1155 item. If you don't answer the questions I don't accept your proposal. Next, the ERC115 and ERC20 combine to form another ERC721a family member. Finally we have multiple other scenarios combining above to form even more special characters. There are multiple collections and various transactions in this ecosystem, some community members do them right away at the same time if they have enough assets. Some of the traits on-chain metadata gets updated too. 1. Which of the above token types are you most and least familiar with, or are you good at problem-solving to figuring out any of them? 2. How can we combine some of th...

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    Technical document writer 3 dní left

    Need to writer a Technical specification for a Crypto website. Person should have a prior experience in writing on those topics.

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    I need a simple smartcontrat with solidity, I need only the code to put it in Remix IDE, requeriments: - 10,000 NFTs - Maximum 3 NFTs per wallet. - One NFT per transaction. - A button to pause the contract. - A button to upload the collection unrevealed and reveal when I want using that button. - Only withdrawls to my wallet, I have seen contracts with commissions to strange people, I don't want it. -The NFT collection is set to sell on OpenSea with polygon, price per NFT 25 matic - Maximum time per sell one week. Thank you for your help!

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    I need an expert who has good understanding DEX for my project. Deep knowledge of AMM, Price calculation is preferred. This is serious and large project, only experts are welcome.

    €37 / hr (Avg Bid)
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    I need an expert who has good understanding DEX for my project. Deep knowledge of AMM, Price calculation is preferred. This is serious and large project, only experts are welcome.

    €57 / hr (Avg Bid)
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    I need to be able to connect node.js to a btc wallet which I own and I need to be able to send coins programmatically. This should involve a simple module around 100-200 lines which I can easily integrate into my code. I can only pay exactly $40

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    Hello, I need an NFT Game developer

    €4516 (Avg Bid)
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    Blockchain Developer 3 dní left

    We are expecting blockchain developer to develop our own concept,

    €578 (Avg Bid)
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    We have issue in ledger wallet sign message function . There is no any function in solana wallet adapter for that and we need to figure out and implement sign message function ourselves.

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    Need a nft marketplace 3 dní left

    We need a website where users can buy nfts created from admin panels, automatic replies will be ignored.

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    I run a business where I receive payments online for services. I use payment gateways for this purpose which cost quite heavily. i am looking for an experienced developer who could build payment integrated system for my website using blockchain technology.

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    Hi, We have requirement of Custom BEP-20 Token Development with Below feature Part One (Token Development) BEP-20 Token Total Supply 2500000 Minable (Owner can Mint more token) Max Sell Per Transaction : 10000 Coins Max Sell Per Day : 100000 Coins Max Buy Per Transaction : 100000 Coins Max Buy Per Day : 1000000 Coins Transaction Fee : Sale : 10% Purchase : 1% All above can be editable by Owner/Admin Part 2 Web3 Integration 1. When use will click on Buy Package it will be connected to Trust Wallet/Metamask and amount will be deducted from Wallet Trust Wallet/Metamask on successful event 2. When user will withdraw amount token for the same amount will be credited in to Trust Wallet/Metamask For more explanation will do zoom meeting

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    We at Alaio is looking for a strong content writer who can write social media post/blogs content for our platforms. Native English speaker Portfolio & samples of work Bachelor’s degree in Journalism or similar field Minimum 3-4 years in the blockchain space or similar technology area SEO experience is a plus Experience with Medium & Mailchimp Great communication skills Knowledgeable about technology & blockchain 3+ years experience in writing technical papers Ability to work under pressure – especially under tight deadlines

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    Build and deploy your contract using truffle. Write a node-js script to send the transaction. Write a node-js script to get the transaction. Its very simple i have not time so you can do it for me Budget 10$ fixed not a big task

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    I need to create a custom defi app on Tron blockchain 1) Create frontend and connect with Tronlink browser plugin so that people can login using Tronlink 2) Create a DASHBOARD (there already is ) 3) Implement staking (Mongo Based not chain based --> code already is there need to update) 4) Create realtime price graph (based on market pair of tokenA:tokenB) The above codes are almost there so developer should be able to extract and redeploy 1) Make the frontend able to connect to steem blockchain using steemkeychain 3) Make use of steemjs to listen to incoming transaction in an specific account (i.e incoming steem transactions) 4) Execute tron transaction based on the steem transaction 5) enable steem vote selling by using steem token itself or trc20 tokens on our platform 6) en...

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    Real Estate Blockchain APP 2 dní left

    Attention please! Please read the job description and links, attachment carefully before you apply to this job. Hello, I am looking for an expert blockchain app developer to create and escrow app for small to large transactions using fiat currency, possibly using chainlink for the conversion. here i will upload a powerpoint presentation on the basic app functions and a few links that show how this can be done on the blockchain. This job will be required to be built from scratch, backend and front end, the user interface design. The app needs to be compatible across all platforms, iPhone, tablets, android devices. Im looking for a seamless integration and has to be build in a way that is scalable for all future added features. ESCROW ON THE BLOCKCHAIN How to use blockchain for escrow t...

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    This is a bootstrapped startup with potential to scale rapidly. Experience and passion for blockchain, smart contracts, Dapp, DAO required.

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    I would like to create a messaging api like WhatsApp but in web 3 connection only

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    Blockchain network is Solana and ETH. I wish to sell traits and base characters on Solana. But when the user creates their new nft they can choose between ETH or solana. Once they decide which block chain the nft is blocked from the other

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    ICO development 2 dní left

    I would like to know how much would cost a complete whitepaper for the ICO which is currently being planned. Basically, I want to raise capital to invest in Brazil real economy businesses through crypto.

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