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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    36 trabalhos encontrados, preços em USD

    Olá, Ficamos felizes que você tenha se interessado pelo nosso projeto. Abaixo listamos algumas necessidades que consideramos essenciais para a contratação do freelancer e um pouco sobre o que será necessário. Necessitamos de 4 relatórios mensais, sendo 1 por semana. A boa noticia é que o freelancer terá serviço recorrente to...

    $163 (Avg Bid)
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    3 ofertas

    If you are experienced in the blockchain development with Hyperledger Fabric and Nodejs, please apply to this job. When submitting the proposal, including the projects that you have worked with Hyperledger Fabric. I will discuss and share the details with the right candidate. Regards,

    $801 (Avg Bid)
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    7 ofertas
    Desarrollar Sitio Web PWA 6 dias left
    VERIFICADO

    Necesitamos desarrollar Sitio web en el formato PWA utilizando tecnicas MEAN, el sitio web debera funcionar como tienda en el cual podamos mostrar y vender nuestros productos, requerimientos de proyecto en Archivo Adjunto

    $30 - $250
    Local
    $30 - $250
    0 ofertas

    I need someone to integrate trustwallet on my site.

    $172 (Avg Bid)
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    6 ofertas
    Blockchain Explorer -- 2 6 dias left
    VERIFICADO

    Hello, we are searching for a skilled developer in order to work on our Blockchain Explorer UI. Please save us time if you are not experienced!

    $174 (Avg Bid)
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    12 ofertas

    I need a Linux OS distribution image for clients, web interface for managing, admin backend, etc. I have my own servers to host it, I also need the code in my github account. I have to be able to add or remove mining softwares on the admin back end, control my customers balance, etc. it has to support both GPU and CPU mining simultaneously.

    $1125 (Avg Bid)
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    6 ofertas
    Help me build a PVIX fork 5 dias left
    VERIFICADO

    Need someone who is able to write me a good tutorial of forking PVIX coin ! I don't want you to build the fork and give it to me. I wan't you to show me or write me each steps.

    $560 (Avg Bid)
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    5 ofertas

    Hi, I looking for the best inovation solutions in blockchain for e- commerce. Pls contact on priv.

    $289 (Avg Bid)
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    9 ofertas

    I need someone to help me setup my own mining pool, preferably Yiimp

    $245 (Avg Bid)
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    2 ofertas

    I need you to develop some software for me. I would like blockchain network with multiple nodes software to be developed for Windows using Python.

    $12 (Avg Bid)
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    2 ofertas

    I have a token called H3D (solidity smart contract). Whenever someone buys or sells H3D through our site ([fazer login para ver a URL]), 10% of the purchase (in HEX, what people use to buy H3D) is distributed amongst the token holders. The value of H3D goes up as more people buy, and down when people sell. We launched and all was well, but someone discovered a bug that allowed one of the developer...

    $566 (Avg Bid)
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    14 ofertas

    Looking for experienced developer related to Hash betting game. Exiting similar this gaming platform Using this based on [fazer login para ver a URL] ,, i want to change some design and function. And need to check debug for games. [fazer login para ver a URL] [fazer login para ver a URL]

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    10 ofertas

    Needs to hire 3 Freelancers We are looking for experienced trainers to deliver 1 x day workshops in different IT technologies: * IT Security * Cybersecurity * Network Security * Azure Cloud * Blockchain * Artificial Intelligence * Penetration Testing Preferred Timezone - Middle East, Africa, APAC, Australia, Newzealand You will be asked to answer the following questions when submitting a propo...

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    12 ofertas

    [fazer login para ver a URL] address [fazer login para ver a URL] [fazer login para ver a URL] project requirements According to the official code, to optimize the efficiency of the block encapsulation code, you need to compile in go language. Anyone familiar with go language and rust can contact me.

    $309 (Avg Bid)
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    9 ofertas

    I need ethereum web3j app in android or a java class that can do the function: 1. Create Account (Public address and Private Key) 2. Erc20 Send transaction 3. Ethereum send transaction 4. Get balance 5. Should be in mainet connection in infura Refrence link : [fazer login para ver a URL] and [fazer login para ver a URL] Only freelancer that has experience on it are allowed to bid as I need...

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    4 ofertas

    Hello, we are searching for a copywriter/content writer who can add content (fill blanks) on our new website in English. Our website is cryptocurrency-related, so you need to know basic stuff about Bitcoins and blockchain. DO NOT apply if you have no knowledge about this topic. Please send any previous work you had on this topic. Website content is about 3000 words long but may increase a little. ...

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    26 ofertas
    PIVX blockchain expert 2 dias left
    VERIFICADO

    Hi, we are willing to complete our Blockchain team so please make sure you are familiar with Dash and the fork PIVX.

    $595 (Avg Bid)
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    17 ofertas

    DASH fork needed --- just a new coin with different reward system

    $601 (Avg Bid)
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    16 ofertas

    I would like to build a faucet site that pays HEX every week. I'm after a clean interface, the site style will be built in a similar way to http://hex.toys. total deadline: $500

    $118 / hr (Avg Bid)
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    14 ofertas
    BLOCKCHAIN API (RBF FIX) 2 dias left
    VERIFICADO

    Hello Everyone, We are using blockchain as our payment service but blockchain doesn't support RBF i.e Replace by fee So our system is vulnerable to double spend attack or 51% attack Well , we have prevented it using minimum one confirmation for lower amounts But for one confirmation sometimes it takes 1-2 hrs. We want to let user balance auto update as they pay to address but by checking...

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    2 ofertas
    Ethereum Web3j java android app 2 dias left
    VERIFICADO

    I need ethereum web3j app in android or a java class that can do the function: 1. Create Account (Public address and Private Key) 2. Erc20 Send transaction 3. Ethereum send transaction 4. Get balance 5. Should be in mainet connection in infura Refrence link : [fazer login para ver a URL] and [fazer login para ver a URL] Only freelancer that has experience on it are allowed to bid as I need...

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    3 ofertas

    Hello! I'm looking for a BEST Wordpress developer! We have about 90 pages of ppt web development plan. (with Mainpage, Subpage design) And we want this function 1. A system that, like FIVERR, allows a seller to enter and sell the copyrights that the seller wants to sell. [fazer login para ver a URL] payment system (both sellers and buyers check the month of use, a period of use, etc. accordi...

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    Using computer and vision and machine learning, verify the validity and quality of video transcoding with H264 without having to re-do the transcoding. Requirements: * Deep understanding of video transcoding workflows * Familiarity with signal processing techniques * Familiarity with video quality measurements such as SSIM, PSNR and VMAF * Has prior experience in security and/or cryptography * Is...

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    We have a protocol developed in Solidity. This protocol has a relayer module which processes the transaction without taking gas fee in ETH from the users. Fee for the transaction is paid by relayer and once the transaction is processed, ETH is refunded to the relayer. We would like to add a method that will refund the fee in ERC20 token as well. Implementation is based on [fazer login para ver a...

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    Looking for a blockchain developer for setting up Trust Wallet at my server. Further work will be assigned after successful completion of the wallet.

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    I want a programme I can run on a DigitalOcean server that uses Twitter's API to monitor accounts I specify by username. When the user I specify tweets or re-tweets, the programme should send a transaction on the Ethereum blockchain from one address to another, with the text of the tweet (as hexadecimal) as the 'Input Data'.

    $280 (Avg Bid)
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    5 ofertas

    I want a programme I can run on a server that uses Twitter's API to monitor accounts I specify by username. When that user tweets or re-tweets, the programme should send a transaction on the Ethereum blockchain from one address to another, with the text of the tweet as the 'Data Input'.

    $193 (Avg Bid)
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    2 ofertas
    Need a blockchain developer 1 dia left
    VERIFICADO

    I need a blockchain developer who can fix the double-spend attack on my website made by laravel using blockchain official api

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    3 ofertas

    Hello, im looking for developer who can code bitcoin payment gateway for my site, i dont want use any middle sites

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    7 ofertas

    I need a new website. I already have a design, I just need you to build my personal website.

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    7 ofertas
    Blockchain hardfork 21 horas left

    looking for a new crypto coin for myself by hard forking any good existing blockchain. Only experienced developer contact me. Fixed budget : 500$

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    Bitcoin JSON RPC making issue 21 horas left
    VERIFICADO

    I am using this PHP library for using Bitcoin JSON RPC. [fazer login para ver a URL] here have an issue with this method /** * Get [fazer login para ver a URL] balance. */ $balance = $bitcoind->wallet('[fazer login para ver a URL]')->getbalance(); echo $balance->get(); // 0.10000000 i need to solve this issue if anyone has experience with this just need help. I have a read...

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    We want to develop a token on Ethereum Blockchain and Smart Contracts starting from a whitepaper in our possession.

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    To do a fork of a crypto project along with Explorer, web api's, SDK , web based browser wallet and reference number payments along with exporting any of these can be - NANO, IOTA, Stellar, Ripple (if you can get the source code)

    $251 (Avg Bid)
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    7 ofertas

    Hello, i need working bitcoin payment system on my website using blockchain api

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    9 ofertas

    I need a coin made on etherum block chain.

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    7 ofertas

    Artigos da Comunidade dos Principais Blockchain