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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. Contratar a Blockchain Developers

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    48 trabajados encontrados, precios en USD

    I want to create a one slide software architecture diagram for my block chain based digital certificate storage/ (technology stack)verification

    $1 - $6 / hr
    $1 - $6 / hr
    0 ofertas
    I need blockchain website. 6 días left
    VERIFICADO

    Hello Freelancers. How are you? I need blockchain site. I got one project from client and now i need to prepare architecture diagram for 1~2 hours. Please see attached file.

    $2409 (Avg Bid)
    $2409 Oferta Promedio
    16 ofertas

    This project is only for senior experts who have proven experiences in Android&iOS wallet of several crypto assets. Need to provide several digital assets like BTC, ETH, Monero, USDT Send, Receive, Exchange between assets functions to be implemented Need import/export private key Backup wallet function need Hybrid is preferred Please describe about decentralize and centralize experiences about...

    $4050 (Avg Bid)
    $4050 Oferta Promedio
    24 ofertas

    !! READ the REQUIREMENTS before you knock !! 1. You are expected to have good knowledge on areas such as; blockchain attacks/crypto-threats/solidity/Smart-contract/Hash-Algorithms/51% attacks/Sybil attack/. 2. You will need to figure out a security issue in the blockchain network. We can help you with that. Some issues can be 51% attack, Sybil attack, BGP Hijacking, Eclipse attack, Smart Contr...

    $9 / hr (Avg Bid)
    $9 / hr Oferta Promedio
    2 ofertas

    I am looking for support in designing a peer to peer energy system that utilises blockchain and the lightning network. Needs to be scalable to 1 billion transactions per second. This is just a design and proof of concept

    $826 (Avg Bid)
    $826 Oferta Promedio
    14 ofertas

    We are seeking crypto professionals in NYC! We are seeking everything from white paper contributors to developers and smart contract professionals.

    $1211 (Avg Bid)
    $1211 Oferta Promedio
    8 ofertas

    !! READ the REQUIREMENTS before you knock !! You are expected to have good knowledge on areas such as; blockchain attacks/crypto-threats/solidity/Hyperledger/Smart-contract/Hash-Algorithms/51% attacks/Sybil attack/. You will be provided with any online books/Journals/articles that you will ask for regardless of how expensive they are. Programming skills required and essential. Your task ...

    $3 / hr (Avg Bid)
    $3 / hr Oferta Promedio
    3 ofertas
    MultiSig Wallet App iOS/Android 6 días left
    VERIFICADO

    MultiSig Wallet App iOS/Android Ability to Buy and Swap crypto using [iniciar sesión para ver URL] API Trade crypto using user existing API (binance, coinbase pro, [iniciar sesión para ver URL]) Send and Receive Crypto Wallet Creation inc Import and Export feature Live chat support Design will be supplied and API

    $2971 (Avg Bid)
    $2971 Oferta Promedio
    43 ofertas
    CRYPTO CURRENCY 5 días left
    VERIFICADO

    developer that know Blockchain with experience with cryptonote technology sources.. like Monero and/or Bytecoin to add on our official developer team.

    $951 (Avg Bid)
    $951 Oferta Promedio
    17 ofertas

    We are working on using barcodes, app , USSD or another simple tech that will be used to receive data in low income communities which will be stored using blockchain tech

    $253 (Avg Bid)
    $253 Oferta Promedio
    10 ofertas
    partners (ONLY) in Partnership 5 días left
    VERIFICADO

    I am looking for partners for a new Crypto project create wallets, create token, pre sale site (ICO) we can discus about your implication possibility

    $195 (Avg Bid)
    $195 Oferta Promedio
    4 ofertas

    This project is only for senior experts who have proven experiences in mobile wallet of several digital assets. Need to provide several digital assets like BTC, ETH, Monero, .. Send, Receive, Exchange between assets functions to be implemented Need import/export private key Backup wallet function need Provide multi Language Hybrid both possible

    $4155 (Avg Bid)
    $4155 Oferta Promedio
    42 ofertas

    Looking to hire someone who is familiar with c++ and blockchain development to prepare a Qt creator dev ready environment for [iniciar sesión para ver URL] on Windows 10 VM. *MY BUDGET IS 40 AUD*

    $27 / hr (Avg Bid)
    $27 / hr Oferta Promedio
    14 ofertas
    compile a coin for me 5 días left
    VERIFICADO

    Hi I want you to compile new coin for me with Explorer Windows and linux wallet Minning pool

    $713 (Avg Bid)
    $713 Oferta Promedio
    10 ofertas

    Hi there, I need someone who is able to create a ethereum node and implement a smart contract which allows the deployment of certifications. Simply Entity-A releases a certificate to entity B with few details, name, expiration, this is push on the blockchain. Please contact me for more information. Fed

    $179 (Avg Bid)
    $179 Oferta Promedio
    19 ofertas
    Need to Fork Litecoin 5 días left
    VERIFICADO

    Hi All, I want to Fork a coin based on LTC. Experience in Blockchain and cryptocurrency will only place the bid. Details will be shared over personal message. Thanks

    $917 (Avg Bid)
    $917 Oferta Promedio
    20 ofertas

    I'm looking for a developer who can create an Erc-20 token with intellectual property written in the smart contract. So the tokens legally represent shares of the intellectual property. In our case, the intellectual property will be songs. Also written in the contract, we would like the addresses and wallet value to also be part of the token. Wallet addresses on other cryptos such as music...

    $444 (Avg Bid)
    $444 Oferta Promedio
    21 ofertas
    Create new version of at code 5 días left
    VERIFICADO

    I want a new version of a qr code created to store more information. I want either more modules or more colours. Maybe black, white, grey, blue, green and red as an option or other option is for more modules so instead of 144x144 it can be like 555x555. I will also need to know how much data can be store in the code and how many kB the wr image itself will be

    $68 (Avg Bid)
    $68 Oferta Promedio
    5 ofertas

    This is part one of a multi-part evolving project. This is webapp solution will allow users to extract the blockchain data of the users' wallets. Data will be saved to a SQL server. The webapp will also periodically capture incremental data of the wallets. The webapp will then allow the user to view their wallet ledgers and token asset summary. To keep this project small and on budget, we w...

    $188 (Avg Bid)
    $188 Oferta Promedio
    12 ofertas

    This project is only for senior experts who have proven experiences in mobile wallet of several digital assets. Need to provide several digital assets like BTC, ETH, Monero, .. Send, Receive, Exchange between assets functions to be implemented Need import/export private key Backup wallet function need high security Several Language Native or Hybrid both possible

    $3553 (Avg Bid)
    $3553 Oferta Promedio
    38 ofertas

    Developing a Blockchain Technology for Healthcare data record

    $1874 (Avg Bid)
    $1874 Oferta Promedio
    30 ofertas

    I need a new website. I need you to design and build it.

    $368 (Avg Bid)
    $368 Oferta Promedio
    10 ofertas
    New crypto betting game 4 días left
    VERIFICADO

    I have a new cryptocurrency and have a new idea for a betting game to be used with my currency. I need it to be automated and fair and can be verified. Smart contract or similar to be used for random flip feature so code can be open source and verified

    $423 (Avg Bid)
    $423 Oferta Promedio
    19 ofertas
    Web wallet for new cryptocurrency 4 días left
    VERIFICADO

    Simple secure web wallet required for new dash fork

    $303 (Avg Bid)
    $303 Oferta Promedio
    18 ofertas
    !! Blockchain Job - 3-9 Months !! 4 días left
    VERIFICADO

    !! READ the REQUIREMENTS before you knock !! Key Factors: - You are expected to have good knowledge on areas such as; blockchain/crypto-threats/solidity/Hyperledger/Smart-contract/Hash-Algorithms/51% attacks. - You will probably need to spend 90-130 hours per month to do the required tasks. ( For instance; an experienced person, in the related area, may do the required job in 90 hours, whe...

    $287 (Avg Bid)
    $287 Oferta Promedio
    11 ofertas
    IPFS Installation 3 días left
    VERIFICADO

    Please refer to [iniciar sesión para ver URL] and i Will send you the requirement.

    $124 (Avg Bid)
    $124 Oferta Promedio
    16 ofertas
    Looking for blockchain API 3 días left
    VERIFICADO

    Looking for an expert for the API of these coins (No 3rd Party) XRP BCH EOS STELLER TETHER TRON BTC SV

    $186 (Avg Bid)
    $186 Oferta Promedio
    9 ofertas
    Ico script 3 días left
    VERIFICADO

    I need a ready-made complete ico script, if you have let me know asap.

    $101 (Avg Bid)
    $101 Oferta Promedio
    12 ofertas
    Mobile App 3 días left

    Social media, to publish documents and text

    $551 (Avg Bid)
    $551 Oferta Promedio
    17 ofertas
    BLOCKCYPHER INTEGRATIONS 3 días left
    VERIFICADO

    I NEED SOMEONE TO INTEGRATE BLOKCYPHER API FOR COINS PAYMENT ON OUR SITE

    $184 (Avg Bid)
    $184 Oferta Promedio
    15 ofertas
    ROSCA blockchain application 3 días left
    VERIFICADO

    I need you to develop ROSCA blockchain application. Please google and search for ROSCA if you do not know about it.

    $318 (Avg Bid)
    $318 Oferta Promedio
    4 ofertas

    Dear Sir/Madame Dero is the first crypto project to combine a Proof of Work blockchain with a DAG block structure and wholly anonymous transactions. The fully distributed ledger processes transactions with a twelve-second average block time and is secure against majority hashrate attacks. Dero will be the first CryptoNote blockchain to have smart contracts on its native chain without any extra la...

    $5752 (Avg Bid)
    $5752 Oferta Promedio
    14 ofertas

    Hi! I am looking for a crypto expert to help me understand some of the basic concepts of the blockchain and programming. Thanks!

    $938 (Avg Bid)
    $938 Oferta Promedio
    27 ofertas
    Crypto Mining 3 días left

    Hello, I am looking for someone who has a big knowledge in crypto currencies and mining.

    $31 / hr (Avg Bid)
    $31 / hr Oferta Promedio
    24 ofertas

    Hello! Please be sure you read this prior to contacting or placing a bid so you know exactly what I am looking for. Thank you! The details for this project are as follows: I need a lightweight multi currency wallet. This wallet will NOT have to download the entire chain for all the currencies in this wallet. This wallet will run on Windows 7 and up. The user should be able to switch between t...

    $2195 (Avg Bid)
    $2195 Oferta Promedio
    21 ofertas

    Hello, I want someone to build me a personal Cryptoscreener similar to TradingView, the difference is it will import the coins data from another website and not like TradingView, cause it doesnt have so many crypto currencies. I dont care if its web based or a software. Contact me only if you think you can do it! Thanks,

    $1124 (Avg Bid)
    $1124 Oferta Promedio
    14 ofertas

    Need to develop a Crypto Currency exchange Similar to Binance. Please only beed who worked on Blockchain and Crypto Currency Exchange development.

    $18472 (Avg Bid)
    $18472 Oferta Promedio
    32 ofertas

    Looking for Multi Crypto Currency Exchange like Binance.

    $680 (Avg Bid)
    $680 Oferta Promedio
    12 ofertas

    Create an Blockscout GraphQL setup, make calls to get information to render the ERC721's via Swift through the specified "Trust-wallet-ios". The goal is to render all the ERC20's, as well as any ERC721's in the given mobile wallet on the given RPC address. This job is for not only for a Swift & GraphQL experienced & someone with blockchain knowledge on how to par...

    $155 (Avg Bid)
    $155 Oferta Promedio
    10 ofertas

    Hi MxiCoders Private Limited, I noticed your profile and want to extend my project offer out to you, we can discuss the details over chat.

    $475 (Avg Bid)
    $475 Oferta Promedio
    13 ofertas

    1. Incorporate within an existing site btc and eth payment modules. 2. Encompasses smart contracts setup and also hashing data encryption. 3. Provide all possible and required documentation to managing all infrastructure setup and developed.

    $498 (Avg Bid)
    $498 Oferta Promedio
    26 ofertas

    a hyperledger sawtooth poc need to setup and need training online to internal team members (2)

    $39 / hr (Avg Bid)
    $39 / hr Oferta Promedio
    9 ofertas
    Create security erc20 token 21 horas left
    VERIFICADO

    I need an erc20 security token on blockchain.

    $125 (Avg Bid)
    $125 Oferta Promedio
    7 ofertas

    We are looking to hire someone who is familiar with PIVX forking and masternode. we have Blockchain forked from PIVX and need to add some features/functionalities in masternodes, so experienced developer would be required and see long term relationship. Need to start immediately.

    $2591 (Avg Bid)
    $2591 Oferta Promedio
    26 ofertas

    We need to change in our existing source code (PIVX based) the masternode collateral system. Goal: - The masternode collateral depends on the high of masternodes (the scheme we have done). - Existing masternode will run continuously. The existing nodes in the network will be not affected (coll. is locked all time), only new nodes need the higher collateral (or less when the nodes are decreasi...

    $216 (Avg Bid)
    $216 Oferta Promedio
    14 ofertas
    build a virtual betting website 11 horas left
    VERIFICADO

    we are looking for a expert to build us a virtual betting website, to bid kindly note that you have to list the required things needed for a good virtual betting website for us to consider your bid, both for admin and front-end pages.

    $1521 (Avg Bid)
    $1521 Oferta Promedio
    65 ofertas

    SOFTWARE 1. Programming language : python / Java 2. Blockchain : etherium solidity 3. Dummy database : SQL 4. Interface : PhP framework 5. API : postman 6. Machine learning : random forest MODULE 1. User trust model 2. Device trust model 3. Information trust model 4. Malware detection 5. Evidence collection IMPORTANT NOTES 1. All trust model information will not be stored in the database. It wi...

    $645 (Avg Bid)
    $645 Oferta Promedio
    18 ofertas