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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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    82 trabajados encontrados, precios en USD

    Buenas, queremos crear una sociedad en España, dedicada a la tokenización y fraccionamiento de propiedades, servicios vacacionales y equipamientos deportivos. Necesitamos crear y lanzar nuestro token en una ICO, como utility token para obtener la financiación inicial y posteriormente elaborar y comercializar NFTs que ayuden al desarrollo de cada uno de los proyectos. Nos gustaría poder contar con sus servicios, ya que necesitamos una estructura sólida y confiable, desarrollada por expertos en la formar un equipo de trabajo blockchain que trabaje junto con la dirección de sistemas. Quedamos atentos a cualquier comentario así como a establecer una reunión online en la aclarar los diferentes puntos. Saludos cordiales, English: H...

    $2871 (Avg Bid)
    Acuerdo de Confidencialidad
    $2871 Oferta promedio
    72 ofertas

    Programador que ayude a solventar temas de vulnerabilidades web en nuestros sistemas de blockchain.

    $284 (Avg Bid)
    $284 Oferta promedio
    12 ofertas
    I need Rust expert to fix bugs. 6 días left
    VERIFICADO

    Hi freelancers. I need an experienced Rust developer with strong working knowledge and excellent familiarity with blockchain technologies. I have some bugs in project developed by Rust. Budget TBD. Requirements: - Rust developer, ideally 2 years+ - Crypto experience: creation of smart contracts, wallet interactions, code audits. - Specific experience with Rust development for NEAR protocol.

    $140 (Avg Bid)
    $140 Oferta promedio
    4 ofertas

    As the title states. This is the error I get: Invalid type for argument in function call. Invalid implicit conversion from string storage ref to bytes memory[] memory requested. Will provide code when contacted. I need it ASAP

    $30 (Avg Bid)
    $30 Oferta promedio
    6 ofertas
    Lead blockchain engineer 6 días left
    VERIFICADO

    Full stack engineer with experience in Rust programming needed for a long term projects. Should be able to work on independent projects and overseeing other development work. Represent the project as technical lead and communicate with other projects when needed. Extensive knowledge of blockchain needed.

    $57 / hr (Avg Bid)
    $57 / hr Oferta promedio
    5 ofertas

    I want to mine eitherium with Google colab python script in free

    $17 / hr (Avg Bid)
    $17 / hr Oferta promedio
    7 ofertas

    AYRA ECOSYSTEM APP: AYRA BEP20 TOKEN: I need a withdrawal method for tokens earned by users. They must be able to withdraw Ayra token both in Metamask and in trust wallet as a minimum.

    $624 (Avg Bid)
    $624 Oferta promedio
    23 ofertas

    We are looking to hire a Lead Solidity Engineer who is self-motivated, goal-orientated, and a strong team player. The perfect candidate takes pride in their work and knows what it means to deliver high-quality products. This position will oversee both internal and external smart contract developers. Responsibilities: Lead development of all of the company’s smart contracts Manage and grow a team of smart contract developers Develop, test, and deploy new smart contracts using Solidity Work with product and design for continued enhancements Keep smart contracts in-sync with developed protocol(s) Monitor the ongoing health of our smart contracts and ensure their security Build and maintain core smart contract technologies ...

    $48 / hr (Avg Bid)
    $48 / hr Oferta promedio
    45 ofertas

    Bitcoin transaction generator app needed for educational purposes.

    $545 (Avg Bid)
    $545 Oferta promedio
    23 ofertas

    The pool already running and config as PROP Auto generator now: FPPS or PPS+ auto generator payments method configure and setup Its not VPS Server. Team viewer remote for doing project req. If you have done it before please massage me and we talk about it. Requirement: ****Experience Done it before - Must be Expert in YIIMP mining pool.**** Please Don't Bid if you had no experience in YIIMP. ***Enable to start project in12hour. **** No milestone **** Full Payment after checking project. ****Max budget : 80$**** Higher BID & Auto bot BID will be removed. If you BID Don't ask for Higher BID in private, your Bid will be removed & and You will get Block by our company. ***

    $80 (Avg Bid)
    $80 Oferta promedio
    7 ofertas

    Hi, I am looking for a Blockchain / solidity developer to Create a Bot to execute Flash loan operations. Looking for a long-term working relationship. Regards

    $619 (Avg Bid)
    $619 Oferta promedio
    43 ofertas

    Being a part of UpRizeNow, you will be able to aligned to get niche skills technology projects at anytime. While our mobile application facilitates sometime extras that increase extra earning: • Avail IT projects faster and at your rates • Communicate more effectively with company • Share real-time information & timesheet for faster approval • Get Instant payments & ratings That being said, if I can provide more insight or support on how to leverage UpRizeNow to get into new way of work, I am happy to help. Do you mind taking 20 seconds time to download our app? Explore Mobile App Now: App Store: Play Store: Register through Web: I look forward to talking with you.

    $38 / hr (Avg Bid)
    $38 / hr Oferta promedio
    3 ofertas
    Smart Contract using Rust 6 días left
    VERIFICADO

    Hello, If you have any experience with Rust, please let me know. We need help with one task. It is a part of a large project. In addition, after finishing, we will be glad to continue the development of other modules. Orders (protocol example - ): - Create an order - Order cancellation - Order filling - Getting information about the current price for a pair Requirements to task: - The environment must be configured for testnet and mainnet (and other networks if necessary) - Documentation must be present - Tests should also be present - Code should be separated by contracts and interfaces If necessary, we will be glad to provide more detailed information.

    $30 - $250
    Sellado
    $30 - $250
    5 ofertas
    NeoEden´s Realm 6 días left

    NeoEden´s Realms origins are inspired from a utopic fantasy world, brought to life with a modern twist involving tangible blockchain solutions, each NFT asset is carefully hand drawn and programed by our brilliant world wide team! Born from fantasy, brought to reality, Neo Edens Realm aims to be a standard for future communities by having impactful decisions driven by its members through NFT technology & DAO solutions, having the project a life of its own thanks to the members that compose and support it. Owners of each Neocard will be able to claim 5 lovely $Roses a day for a period of 5 years , bringing with it new era of “Rosenomics” to the Realm. These $ROSES will be used for various utilities, such as NFT breeding, onchain metadata changes or implemented DAO vot...

    $544 (Avg Bid)
    $544 Oferta promedio
    18 ofertas

    Looking for a good NFT developer who holds good experience in NFT development especially from India

    $481 (Avg Bid)
    $481 Oferta promedio
    16 ofertas
    Crypto Content Writer 6 días left
    VERIFICADO

    I'm looking for a writer with a passion for crypto to write articles for a new blog project... This will be focusing on just one new area of blockchain only, a new protocol that could revolutionalize the industry. This is very much a testbed opportunity and time would be dedicated to researching and writing blog posts on just one up-and-coming protocol This would be an entry-level position that could turn into something long-term and pretty lucrative for the right candidate. Required is a high-level understanding of blockchain and the ability to explain technical complexities. PLEASE ONLY APPLY - If you have a good understanding of blockchain as this particular protocol is so new it will go over your head. On the other hand, if you have a passion for web3 and the future of block...

    $4 / hr (Avg Bid)
    $4 / hr Oferta promedio
    50 ofertas

    A Cryptocurrency technical advisor for my BEP20 Token - I need general assistance to learn how to build and implement : - Reflections - How token holders are issued these reward tokens 4% is Redistributed to all existing holders - Liquidity Pool Acquisition 3% is added to liquidity -Token Burn 2% of tokens are burned -Growth Fund 1% is added to the SafeMoon Ecosystem Growth Fund - You need to advise how my new BEP20 token will build and implement these requirements. No coding is required.. Just technical advise.

    $14 / hr (Avg Bid)
    $14 / hr Oferta promedio
    28 ofertas

    I want to make a lotto game and users can play with picture below is just a rough design, just to explain the principle of how to play. If you are interested in doing this project, please contact me.

    $3114 (Avg Bid)
    $3114 Oferta promedio
    29 ofertas
    Complete my NFT marketplace 6 días left
    VERIFICADO

    I would like to finish developing my NFT marketplace which was left undone.

    $1213 (Avg Bid)
    $1213 Oferta promedio
    33 ofertas

    I need a smart contract expert to build a smart contract similar to another existing smart contract's decompiled bytecode. Let me know if you previously have worked woth decompiled bytecode.

    $237 (Avg Bid)
    $237 Oferta promedio
    28 ofertas

    I am looking for a blockchain developer who can code smart contracts, web3 ability and is able to create valid APIs

    $138 (Avg Bid)
    $138 Oferta promedio
    59 ofertas

    I am interested in developing a project( real estate ) tokenization platform and decentralized, send me a message if you have experience and can handle the smart contract.

    $1237 (Avg Bid)
    $1237 Oferta promedio
    64 ofertas

    Solutions to some significant challenges of payment transactions for electric batteries, charging points queuing, and charging process;

    $174 (Avg Bid)
    $174 Oferta promedio
    16 ofertas

    The project is to build a simple betting website in which users can register with their MetaMask wallet and bet on available sports events. After an event outcome is decided by admin, users who predicted the result correctly get rewards proportional to their betting amount and the house gets 5% of the total sum. -Events are created by admin. Each event has two competing teams each with its own photo. There can be 4 possible outcomes for each event (win, loss, draw, cancelled). - Each user can have simple profile (avatar and bio and showing his betting history) - User also have settings options to be notified about their betting outcomes and newly published bets. - Each event has a deadline to bet, amounts betted on each result and the list of participants on each event. Each event also ...

    $66 / hr (Avg Bid)
    $66 / hr Oferta promedio
    37 ofertas

    We have a ERC-20 based token, which needs a pre-launch audit. Scope of work - code accuracy - proof of stake readiness - code fulfills development requirements -correction of errors -confirm launch readiness We assume 2-3days work the max. Please share previous experience

    $2434 (Avg Bid)
    $2434 Oferta promedio
    19 ofertas

    A configured and functional blockchain infrastructure based on Hyper-ledger or ethereum , demonstrates the traceability of transactions and the conversion of points into a kind of currency that can be used within the platform. VM , code sources , documents....etc will be provided . i need an expert that can do that quick. ( two developers failed on this project for lack of competency, if you don't know anything about Blockchain ,there's no reason to contact or to accept this job) . Reach out to me if you have the necessary skills and please stop asking me to increase the budget !

    $226 (Avg Bid)
    $226 Oferta promedio
    28 ofertas

    We are providing a code signing service for various platforms. For macOS, we plan to provide a CryptoTokenKit provider that can be used by Xcode, Xcodebuild and codesign, and that talks to our backend service for actual signing operations. We also need an installer that does not require user interaction. We already provide a cross-platform C++ library that connects to the backend, which does the actual crypto operations. A few modifications might be necessary on our side. You will need basic applied cryptography knowledge. You must understand the concepts of code signing, certificate management, and smart card key access in macOS (although no physical smart cards will actually be used). You will contribute platform-specifc knowledge to a team of experienced software developers. P...

    $39 / hr (Avg Bid)
    Acuerdo de Confidencialidad
    $39 / hr Oferta promedio
    15 ofertas
    Build me decentralised platform 5 días left
    VERIFICADO

    We need a decentralised eSports platform combined with fantasy tournaments,only teams with good experience in blockchain technology may bid, companies near NCR region should bid

    $10778 (Avg Bid)
    $10778 Oferta promedio
    24 ofertas

    I want to create and deploy smart contract to ETH

    $508 (Avg Bid)
    $508 Oferta promedio
    49 ofertas
    Dynamic NFT with Chainlink Keeper 5 días left
    VERIFICADO

    Looking for a developer who is comfortable with Dynamic NFT development and able to integrate Chainlink Keeper for smart contract automation. Developer also needs to be skillful in frontend React development as user experience for the minting site is important. Required Skill: React, IPFS, Chainlink, NFT development

    $519 (Avg Bid)
    $519 Oferta promedio
    54 ofertas

    Major modification in the blockchain project is required, Demo must be given through Anydesk, UI must be developed representing charts. Maximum time duration is 7 days. Only committed personnals contact me. Make sure ur freelancer account is valid. The only payment method would be through freelancer account.

    $556 (Avg Bid)
    $556 Oferta promedio
    34 ofertas
    ERC-20 token code audit 5 días left
    VERIFICADO

    We have a ERC-20 based token, which needs a pre-launch audit. Scope of work - code accuracy - proof of stake readiness - code fulfills development requirements -correction of errors -confirm launch readiness We assume 2-3days work the max. Please share previous experience

    $324 (Avg Bid)
    $324 Oferta promedio
    31 ofertas

    I want a blockchain expert who is very good at olympus dao platform. I need some smart contract changes and current frontend integration. Please apply if you are a good fit for this project. Thanks

    $1013 (Avg Bid)
    $1013 Oferta promedio
    22 ofertas
    Long Term NFT Minting Project 5 días left
    VERIFICADO

    Requires a specialist who is able to develop a token and a smart contract. We need a specialist for not just one project, we launch about 10 projects a month and we need a specialist for each of them, if we can work with you, we would be glad to have a long-term cooperation. Now we are ready to discuss this project and start working. Firstly this role will require paid test and it would be simple smart contract. Please see attachment file and bid with your creative answers. I will hire 2 candidates with right understanding. Please start your bid with "contract expert" Thanks.

    $25 - $50 / hr
    Sellado
    $25 - $50 / hr
    61 ofertas
    Rust Expert Needed 4 días left
    VERIFICADO

    Seeking RUST developer to fix error of exciting staking project! Security-orientated team. Pentesting skills would benefit the project as a whole but not nececary. Strong RUST development skill required.

    $19 - $37 / hr
    Sellado
    $19 - $37 / hr
    40 ofertas

    DO NOT BID UNLESS YOU ARE A SOLIDITY DEVELOPER FROM IASI, ROMANIA OTHERWISE I WILL REPORT YOU. Salutare. Caut un developer in Solidity care poate face un token custom si care sa fie dispus sa ne intalnim fata in fata pentru a discuta detalii despre proiect.

    $499 (Avg Bid)
    $499 Oferta promedio
    24 ofertas
    Smart Contract Code Reviews 4 días left
    VERIFICADO

    Looking to bring someone to do quick smart contract code reviews and fill out a form with the results. Code reviews will take 30 minutes to an hour and we're looking at about 20 reviews a month.

    $440 (Avg Bid)
    $440 Oferta promedio
    106 ofertas

    Its for an NFT related coding for a new website. Smart contract process api with a nft market, blockchain api coding, payment gateway with crypto

    $896 (Avg Bid)
    $896 Oferta promedio
    64 ofertas

    Hello, i need a site with a like. The system should be able to work manually and automatically Where can we connect api for Kyc and Aml He will be able to attract prices through a site that we will provide. For the following period, money and coin options will be added I want to build a site with a fairly high level of security for the user and the company. Merhaba, benzeyen bir siteye ihtiyacım var. Sistem manuel ve otomatik olarak çalışabilmeli Kyc ve Aml için api bağlayabileceğimiz Bizim vereceğimiz bir site üzerinden fiyat çekebilecek. İlerleyen dönem için, para ve coin seçeneği eklenebilecek Kullanıcı ve firma için güvenliği oldukça yüksek bir site yaptırmak istiyorum.

    $1548 (Avg Bid)
    $1548 Oferta promedio
    37 ofertas

    Develop BEP20 token smart contract with taxes and upgradable. Requirements> Share your portfolio in comment bscscan and similiar >In supply : 1b >Total tax: >>Development wallet: 4% >>Marketing wallet: 4% >>Reward wallet: 2% >>Trezor wallet: 2% Participate: >>send smart contract to test >>>1st payment >>after its deployed on mainet New tasks >>> develop dapp with other team members >>>>2nd payment - per hour or per project

    $158 (Avg Bid)
    $158 Oferta promedio
    38 ofertas
    Blockchain Expert Needed 4 días left
    VERIFICADO

    Hi I need a Blockchain expert who is well versed in the mempool and transactions within the mempool. The selected freelancer should have excellent working knowledge of how transactions are mined by miners on the BSC network and how mining algorithms work. Your main task is helping me to understand how transactions are placed in the block and how I maximise my chances of selling success. This is a simple job for someone that is an expert in this field.

    $203 (Avg Bid)
    $203 Oferta promedio
    52 ofertas

    ** NOTE: Please only bid if you have read through the job ad and understand what needs to be done, failure to understand upon reading the job ad your bid will be rejected ** I am looking for someone to develop NFT Generator Web App where users can add layers and upload traits which will then generate NFT's with Metadata (Ethereum, Polygon, and Solana) in JSON files. A quick overview of how the web application will work: • Users will add layers of the NFT’s they are looking to generate, e.g. background, head, eyes, nose, mouth. • Users would then upload the traits (image files) of each type of layers, e.g. 4 different backgrounds, 4 types of heads, 6 types of eyes, 2 types of noses, and 4 types of mouths. • Once traits are added under each layer, the appli...

    $3758 (Avg Bid)
    $3758 Oferta promedio
    54 ofertas

    Hello. Our team is currently looking for the right person to our next big project. We are looking for someone capable of creating a CS:GO Skin / Crypto Casino for us. We're also going to need a fulltime web developer for our project, so this won't be a one time job, it's a full time job that pays well. Together with my business partners, we're aiming for a completely new industry - Online Gambling. All of us have a fair bit of experience in the field overall and we hope that you do aswell. What we need: - A fully functional CS:GO / Crypto Casino - Functional Deposits & Withdrawals - Games such as roulette & crash - And much more Good examples would be and www.csgoroll.com. Please feel free and have a good indepth look of the quoted sites and fu...

    $9264 (Avg Bid)
    $9264 Oferta promedio
    30 ofertas
    Smart Contract Deployed on Remix 4 días left
    VERIFICADO

    I need a smart contract deployed on remix that allows me to send coins to a personal address

    $453 (Avg Bid)
    $453 Oferta promedio
    69 ofertas

    Hi there I am looking for someone full time to join our team to help in our discord your role will vary depending on your knowledge please let me know your answers between 1-10 Tennis Knowledge - 1/10 - NFT knowledge - 1/10 Discord - 1/10 to the area you are most confident please tell me your experience please be honest depending on your answer we will give you a certain role $3 per hour (non negotiable) this is the discord - please message Sabrina in it to make you admin if you want to join payments will be ONCE A WEEK ON FREELANCER (I can't do it daily as I have a team of over 50 so PLEASE dont ask for it daily) THANKS KYLE

    $3 / hr (Avg Bid)
    $3 / hr Oferta promedio
    13 ofertas
    adjust staking website funtion 4 días left
    VERIFICADO

    adjust staking website funtion add more pare to stake add transaction in db add more lock date selection

    $177 (Avg Bid)
    $177 Oferta promedio
    43 ofertas
    Opensea Collection Bid 4 días left
    VERIFICADO

    Hello I would like someone to assist me in create a node js application to make collection bids in Opensea The function will take , the collection slug , price and duration as inputs and successfully make the offer. The perferred way is through the RPC node direcly rather than through the seaport API. To be successful for this job please reply answer these you questions: 1. Can you successfully make a collection bid? 2. Will you do it through the RPC node or Seaport API? thank you

    $342 (Avg Bid)
    $342 Oferta promedio
    16 ofertas
    NFT project 3 días left
    VERIFICADO

    Done with designed the nft need help with technical issues

    $29 / hr (Avg Bid)
    $29 / hr Oferta promedio
    81 ofertas
    NFT Creation Designer 3 días left
    VERIFICADO

    We need NFT Creation Developer, Sk!P3 dvskha

    $103 (Avg Bid)
    $103 Oferta promedio
    20 ofertas
    Smart Contract Code Audit 3 días left
    VERIFICADO

    Looking to bring someone to do quick smart contract code audit and fill out a form with the results. Code audits should take 30 minutes to an hour and we're looking at doing about 20 audits a month. Must be familiar with Smart Contracts and the following attributes: Contract Ownership Airdrops and Backdoors Libraries and Forks Multi-Sig implementations Tokenomics

    $21 / hr (Avg Bid)
    $21 / hr Oferta promedio
    42 ofertas