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Ethereum Oraclize

Github - Oraclize/ethereum-examples: Random Code Examples Showing How To Use The Oraclize Api

Github - Oraclize/ethereum-examples: Random Code Examples Showing How To Use The Oraclize Api

Random code examples showing how to use the Oraclize API If nothing happens, download GitHub Desktop and try again. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Here you can find some code examples showing how easy integrating the Oraclize Ethereum API is. Thanks to our Ethereum API helpers using Oraclize in your Solidity/Serpent code is very easy. In Solidity it is as simple as inheriting the usingOraclize contract: this will provide you some functions, like oraclize_query, which make it trivial to leverage our technology straight away. If you are using Serpent just import oraclizeAPI.se and enjoy the same Oraclize helper functions via macros! It is highly recommended to avoid using serpent, especially in production. The examples have been left for historical reasons but support for it is no longer maintained as serpent is considered outdated and audits have shown it to be flawed. Continue reading >>

Technology Fridays: Oraclize Is The Most Important Blockchain Technology Youve Never Heardof.

Technology Fridays: Oraclize Is The Most Important Blockchain Technology Youve Never Heardof.

Working on a new startup at the intersection of AI and blockchain technologies. Angel Investor, Columnist at CIO.com, Board Member of Several Software Companies Technology Fridays: Oraclize is the Most Important Blockchain Technology Youve Never HeardOf. Welcome to Technology Fridays! As you know, the purpose of this section is to discuss cool and innovative technologies and that are still flying under the radar but that are playing an influential role in new technology trends. Today, we have a perfect example of that type of technology with a platform that has become a key ingredient of many blockchain applications in the real world. I am talking about Oraclize. Building blockchain applications sounds incredibly exciting until you have to deal with the friction between the requirements of real world solutions and the characteristics of the blockchain. There is no other example that illustrates those challenges better than the friction between the need of blockchain application to access data from external systems while maintaining the integrity of the blockchain. In real world blockchain applications, enabling access to off-chain data can become a royal nightmare. Introducing external data implicitly requires trust to centralized systems which violates the immutability and integrity principles of the blockchain. Platforms like Ethereum introduce the concept of Oracle to address this challenge but implementing those is far from being a trivial endeavor. Oraclize is a platform that is trying to provides a solution to off-chain data access in a way blockchain agnostic way. 3. How Much Can You Make on Coinpot in 1Year? The idea behind Oraclize its incredibly simple and yet brilliant. The platform guarantees the integrity of off-chain data by accompanies each requested dat Continue reading >>

Oraclize Documentation

Oraclize Documentation

Welcome to the Documentation of Oraclize! The documentation is divided in the following sections: Background : the rationale behind the Oraclizes Oracle Model General Concepts : the main concepts behind Oraclize Data-Sources : information regarding the types of data sources Oraclize supports Integrations : how to integrate a blockchain application with Oraclize Development Tools : a list of tools to aide development of Oraclize-integrated smart contracts Security Deep Dive : how Oraclizes Authenticity proofs works Pricing : information on our pricing model for production uses Oraclize is the leading oracle service for smart contracts and blockchain applications, serving thousands of requests for day every day on Ethereum, Bitcoin and Rootstock. In the blockchain space, an oracle is a party which provides data. The need for such figure arise from the fact that blockchain applications, such as Bitcoin scripts and smart contracts cannot access and fetch directly the data they require: price feeds for assets and financial applications; weather-related informations for peer-to-peer insurance; random number generation for gambling. But to rely on a new trusted intermediary, the oracle in this case, it would be betraying the security and reduced-trust model of blockchain applications: which is what makes them interesting and useful in first place. One solution is to accept data inputs from more than one untrusted or partially trusted party and then execute the data-dependent action only after a number of them have provided the same answer or an answer within some constrains. This type of system can be considered a decentralized oracle system. Unfortunately, this approach has severe limitations: It requires a predefined standard on data format It is inherently inefficient: all Continue reading >>

Oraclize, Digital Identity To Develop Financial Applications Of Ethereum Blockchain

Oraclize, Digital Identity To Develop Financial Applications Of Ethereum Blockchain

Oraclize, Digital Identity to Develop Financial Applications of Ethereum Blockchain Oraclize has closed on 500,000 in their seed round led by Digital Identity SA, a growing firm delivering services for the Fintech industry. Oraclize has closed on 500,000 in their seed round led by Digital Identity SA , a growing firm delivering services for the Fintech industry. The company believes that Blockchain technology opens many opportunities in a variety of areas, including Fintech and cryptocurrencies. With its primary focus being on financial companies, cryptocurrency wallets, and decentralized exchanges, among others, Oraclize represents a strategic investment securing development of the layer on top of which these financial applications are built. Natale Ferrara, director of Digital Identity SA, commented: Oraclize provides an infrastructure tool essential for Blockchain applications to grow and have a concrete impact. I believe that our investment in Oraclize will support the talented team with its activities and ultimately benefit the Blockchain ecosystem as a whole. In the Blockchain context, the company provides a safe data-transport-layer enabling decentralized applications (dapps). Since 2015, it has served over 200,000 requests on the Ethereum mainnet and several million on test nets, backing its claims with authenticity proofs based on a variety of cryptographic techniques. It aims at developing Blockchain applications in order to overcome common limitations while minimizing additional trust lines. For this reason, the authenticity proofs rely on independent attestors, leveraging both software and hardware-enforced security technologies. Thomas Bertani, CEO of Oraclize, comments: Since launching in March 2015, the Oraclize concept has evolved and reshaped according Continue reading >>

Building A Raffle Smart Contract Usingoraclize

Building A Raffle Smart Contract Usingoraclize

VP Engineering at Polymath Ethereum Blockchain & Smart Contracts Consultant Building a Raffle Smart Contract UsingOraclize Generating random numbers in Solidity is not simple. For starters, Solidity doesnt come with a native random function because the deterministic nature of the system. In mathematics and physics, a deterministic system is a system in which no randomness is involved in the development of future states of the system. A deterministic model will thus always produce the same output from a given starting condition or initial state. There are a number of services and APIs that allow us to generate random numbers, but the problem is that they are not decentralized and you have to trust someone else that the generated number is truly random. Additionally, you cant trust seemingly random values available to the contract, such as blockhash, timestamp, or other miner-defined value. Miners can manipulate these values to such extent, and event choose not to publish a block. For a casino app you cant just trust miners, but there are a lot of other use cases where you could rely on blockhash for generating a random outcome, as long as the total amount of value resting on the quality of that randomness is lower than what a miner earns by mining a single block. More info on this: So, how can we generate a random number securely inside a Solidity smart contract? There are a few solutions out there that can help us achieve this, such as Randao (Randao: .) and Oraclize ( ). In this article Im going to focus on Oraclize, mainly because its extremely easy to get started with it and secondly, because it also can be used to do many more things other than generating a random number, such as accessing any other API from inside a Solidity smart contract. In this tutorial well b Continue reading >>

Ethereum On-demand Data Courier Oraclize Surpasses 100,000 Mainnet Transactions

Ethereum On-demand Data Courier Oraclize Surpasses 100,000 Mainnet Transactions

Ethereum On-demand Data Courier Oraclize Surpasses 100,000 Mainnet Transactions People familiar with the Ethereum ecosystem may have heard of a project called Oraclize. This particular project is used as a data carrier for decentralized applications on the Ethereum blockchain. Earlier today, the company reached over 100,000 mainnet transactions. An important milestone for an oracle service running for nearly two years now. It is good to see services such as Oraclize finally gain some of the recognition it deserves. The worlds leading oracle service has been around for nearly two full years now. It provides on-demand data carrier services for all decentralized applications on the Ethereum blockchain. Since smart contracts cant gather data on their own, Oraclize can be of great value. Moreover, the entire service is enforced by cryptographic proofs, creating a trustless system. Quite a few applications make use of the Oraclize ecosystem so far. Stackexchange, vDice, proof of Identity and the Youtube Contract are just a few examples. All of the contracts making use of this trustless data carrier service have generated over 100,000 mainnet transactions. That is a major milestone for an oracle service. It also highlights the growth in popularity of Ethereum Dapps as a whole. Even though it took the project nearly two years to get here, they are still the leading oracle service in the world right now. Rest assured the popularity of Oraclize will only continue to grow. Decentralized applications are only just now beginning to gain some market traction. Once the whole world sees what the technology offers and how it works, 100,000 transactions over two years will seem like a breeze. An efficient and trustless data carrier with on-demand accessibility can be an invaluable addit Continue reading >>

How Do Oracle Services Work Under The Hood

How Do Oracle Services Work Under The Hood

How do oracle services work under the hood I have read many questions about oracle services, but I do not understand how they work.Often I read answers like this: Smart contract can not access an external environment... But how do "Oraclize" or "RealityKeys" work, and how can I build My own oracle service on a public blockchain? Basically what needs to happen is that somebody says what data they want, the trusted service provides an ID that identifies it (in our case a hash of the data) and a key they'll sign the result with, and somebody sends a transaction to the contract. Then we wait for the result. Once the result is known, the trusted service signs it with their key, somebody sends another transaction containing the signed data to the contract, and the contract does whatever is supposed to happen. This can be done either on-chain or off-chain. We do this off-chain, so we just provide signed data and a key, and users grab this data off our site and send it to their contracts themselves. This would normally be part of a DApp, so for example PredictionToken have a screen that creates a transaction to grab the ID from our site and sets up a contract, and another screen to grab the signed data from our site and send a transaction to settle the contract. Oraclize do it on-chain, so your contract sends a request to their contract, and their contract writes an event to the event log and returns an identifier. They have a process watching the event log, and when the data is ready they send it as a signed transaction to your contract, which checks the sender of the contract (this is another way of checking who signed the data) and does whatever it's supposed to do. From a developer's point of view the advantage of doing it on-chain is that you only have to deal with reques Continue reading >>

Getting Data From The Internet With Oraclize

Getting Data From The Internet With Oraclize

Tutorials and jobs for Ethereum enthusiasts. Smart contracts can interact with data living in the blockchain but it is impossible to get informations from the web. Using Oraclize , well see how your smart contracts can get data from outside the blockchain and execute any API call. Some use cases can be: As seen in our article about the lottery , its hard to generating completely random data on the blockchain can be a problem, you could use Oraclize to get a random number from outside the blockchain. In crowd sales, it could be interesting to know the current $ price of Ethereum or other tokens. In a betting case, it could be interesting to get the result of a sport event from an external website. First of all, you need to understand that reading data from the internet and manipulating money depending on the result requires to thrust an external source. Always keep in mind that you should have a way to pause and retrieve the funds in the smart contract in case of problems or change to the API you are reading from. To try and test how Oraclize works, well use the Remix interface they provide here . This interface lets you discover some samples and test your own code for free on a simulated blockchain. The service is not free and require you to send funds to make queries, the costs inside described on their documentation . You send a query to the Oraclize smart contract. Oraclize receive your query and make the corresponding request. Once they receive the data, they call a callback function of your smart contract where youll be able to access the requested data. For this example we will write a simple smart contract that will fetch the current price of Ethereum in US dollars from thecryptocompare.com public API. First of all, you need inherit form the usingOraclizecontrac Continue reading >>

Oraclize.it Blockchainers

Oraclize.it Blockchainers

Create your own Oracle with Ethereum Studio and oraclize.it This is a follow-up post to Gambling with Oracles and describes the technical part for the implementation of an Oracle with oraclize.it People told us last time that we had not really created an binary option. This might be true and to not confuse the reader and also to introduce just another cool use case and link to current events, we are going to bet on the winner of the EURO 2016 soccer championship. As you see from the posting date, the championship is already finished and the winner is well known, it is Portugal. So we can just create a static Oracle to make things easier, we will define the Oracle call in our betting contract and on calling update(), the winner will be determined, which is the static json {winner: portugal}. You can call bet(winner) with exactly 1 ETH and on calling claim() you will get nothing or (loseBets + winBets) / (numberOfParticipantsWhoBetOnWinner), eg. 3+2/2 = 2.5 You will need to sign up for the ether.camp Studio and check out the corresponding github project in the terminal, follow the instructions in the README. After starting the web server, you can access the Oracle with which redirects to the file web/eu2016winner.json in your project. You can test the data retrieval in the Studio, just choose the Oraclize tab, Test query, URL and put json().winner around the URL. Thats it, by clicking Test you should get the result portugal. So now the Oracle Smart Contract can call your Oracle datasource and submit the result via callback to your contract. Obviously, a real Oracle should be a little more dynamic, but for testing purposes this Oracle is enough. You can change the answer by stopping the web server, changing the file manually and restarting the server. To avoid duplicating Continue reading >>

Ethereum Account 0x76bc9e61a1904b82cbf70d1fd9c0f8a120483bbb Info

Ethereum Account 0x76bc9e61a1904b82cbf70d1fd9c0f8a120483bbb Info

// /*Copyright (c) 2015-2016 Oraclize srl, Thomas BertaniPermission is hereby granted, free of charge, to any person obtaining a copyof this software and associated documentation files (the "Software"), to dealin the Software without restriction, including without limitation the rightsto use, copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of the Software, and to permit persons to whom the Software isfurnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS INTHE SOFTWARE.*/pragma solidity ^0.4.0;contract OraclizeI { address public cbAddress; function query(uint _timestamp, string _datasource, string _arg) payable returns (bytes32 _id); function query_withGasLimit(uint _timestamp, string _datasource, string _arg, uint _gaslimit) payable returns (bytes32 _id); function query2(uint _timestamp, string _datasource, string _arg1, string _arg2) payable returns (bytes32 _id); function query2_withGasLimit(uint _timestamp, string _datasource, string _arg1, string _arg2, uint _gaslimit) payable returns (bytes32 _id); function getPrice(string _datasource) returns (uint _dsprice); function getPrice(string _datasource, uint gaslimit) returns (uint _dsprice); function useCoupon(string _coupon); Continue reading >>

Ethereum - Transfer Erc20 Token With Oraclize And Metamask - Stack Overflow

Ethereum - Transfer Erc20 Token With Oraclize And Metamask - Stack Overflow

Transfer ERC20 token with Oraclize and Metamask I'm a beginner and I've been exploring ERC20 tokens. Since a couple of days I have been looking for a solution to this, but in vain. The problem is the following. I am creating a contract, conforming to the ERC20 protocol. I want to add an extra functionality in the form of an oracle query. I.e., I want to use a service like "Oraclize", to fetch some external data, return the result. Depending on the result I would like to transfer some tokens or not. 1) The example token contract I've been working with is the following. It s the contract from CryptoPunks( ): pragma solidity ^0.4.18;contract CryptoTokensMarket { address owner; string public standard = 'CryptoTokens'; string public name; string public symbol; uint8 public decimals; uint256 public totalSupply; uint public nextTokenIndexToAssign = 0; bool public allTokensAssigned = false; uint public tokensRemainingToAssign = 0; //mapping (address => uint) public addressToTokenIndex; mapping (uint => address) public tokenIndexToAddress; /* This creates an array with all balances */ mapping (address => uint256) public balanceOf; struct Offer { bool isForSale; uint tokenIndex; address seller; uint minValue; // in ether address onlySellTo; // specify to sell only to a specific person } struct Bid { bool hasBid; uint tokenIndex; address bidder; uint value; } // A record of tokens that are offered for sale at a specific minimum value, and perhaps to a specific person mapping (uint => Offer) public tokensOfferedForSale; // A record of the highest token bid mapping (uint => Bid) public tokenBids; mapping (address => uint) public pendingWithdrawals; event Assign(address indexed to, uint256 tokenIndex); event Transfer(address indexed from, address indexed to, uint256 value); event To Continue reading >>

Oraclize (@oraclizeit) | Twitter

Oraclize (@oraclizeit) | Twitter

Pending Pending follow request from @oraclizeit Cancel Cancel your follow request to @oraclizeit World's most widely adopted data-transport-layer connecting blockchain applications to external context. Are you sure you want to view these Tweets? Viewing Tweets won't unblock @oraclizeit Join the Oraclize Meetup London and learn more on the first meetups scheduled! Register @ Thanks. Twitter will use this to make your timeline better. Undo Thanks. Twitter will use this to make your timeline better. Undo EDCON Toronto - live now! Thanks. Twitter will use this to make your timeline better. Undo Thanks. Twitter will use this to make your timeline better. Undo Thanks. Twitter will use this to make your timeline better. Undo EDCON in Toronto, come speak to us if you are interested in oracles , authenticity proofs, secure offchain computation & Thanks. Twitter will use this to make your timeline better. Undo We have been experiencing some delays during the last few hours due to networking issues that affected some of our nodes. The situation is now back to normal and the unprocessed queries are all being recovered. Our apologies for the inconvenience. Thanks. Twitter will use this to make your timeline better. Undo Thanks. Twitter will use this to make your timeline better. Undo Thanks. Twitter will use this to make your timeline better. Undo alicecorsini_ is speaking about trust and external data. Thanks. Twitter will use this to make your timeline better. Undo blockchain_manc meetup - well talk about oraclizeit and the best ways to leverage it (spoiler: its not just an oracle service!) pic.twitter.com/ISC0YIjdVI Thanks. Twitter will use this to make your timeline better. Undo oraclizeit presentation for this evening. It clearly explains the "walled garden limitation problem Continue reading >>

Oraclize/ethereum-api

Oraclize/ethereum-api

@huahuayu the callback you have linked refers to a verified contract ( ) where there are some errors already in the constructor, for example oraclize_setCustomGasPrice(20000000000 wei); is wrong, it should be oraclize_setCustomGasPrice(20000000000); instead there may be other issues in your contract, if you want to ensure you are mastering Oraclize correctly, you could start with a simpler example like the randomExample.sol that you mentioned above I have study randomExample.sol, have familiar with it, the issue you mentioned above may be not an issue, because it can pass compile, whats more, this line of code is exactly as etheroll which stable run quite a while as you can see from , the price in etherscan is exactly same as constructor @oraclize-support not only my program you can run randomExample.sol in ropsten, also failled actually I never success with oraclize_randomDS_proofVerify__returnCode @huahuayu could you please try to compile with solc 0.4.19? We have recently noticed that there are some issues with some functions of oraclizeAPI and solidity compiler > 0.4.19 @oraclize-support I use 0.4.19 and failed again, 1 or 2 times, had success in rinkeby the robust performance is not enough @oraclize-support please, have a try in testnet @oraclize-support do you know why i'd be getting a revert on making a simple oraclize_query oraclize_query("URL", "json(it seems that 'using Oraclize' adds some sort of require, but I am not able to understand it. Any thoughts? Hey, got a quick question about the test query page ( ) If you're doing a computation query, how do you pass an argument? @JatinNanda can you share the code you are using? You may be doing something wrong when sending the query or in the __callback function @bandrebandrebandre unfortunately right now you can Continue reading >>

'kyc Solution' Oraclize Will Link Ethereum Addresses To Ids

'kyc Solution' Oraclize Will Link Ethereum Addresses To Ids

This KYC Solution Will Link Ethereum Addresses to Identities KYC regulations seem to be a pain in the rear for most enterprises interested in exploring the blockchain sector. But there is a potential solution on the horizon in the form of Oraclize, which is working ona way to link real-life identities to Ethereum wallet addresses. Also read: DAO.LINK Bridges Gap Between Business & Blockchain KYC: A Balancing Act in a Trustless World Whenever somebody talks about KYC [Know-your-customer] protocols, it is not hard to see a centralized service or institution collecting user data and storing it somewhere safely. That last part is a topic of substantial debate in recent times, however, as the number of databases breaches and data leaks keeps growing every year. Decentralizing the KYC protocol will be one of the biggest challenges of the past few years. But now thetechnology seems to be catching up. Accountability of all of the collected data is at the top of the priority list, and some Ethereum enthusiasts over at Oraclize (Oraclize.it)have come up with a concept that would actually link Ethereum wallet addresses to user identities. However, there is a note to be made here, as the plan does not revolve around collecting this information and sending it to all parties making use of the decentralized solution. The E-Estonia citizenship initiative is a significant step* in this direction, as the digi-ID devices used can actually link a real identity to an Ethereum address. Doing so requires the usage of RSA signatures , which are then verified by an automated smart contract. While the possibilities of this technology are virtually limitless, it would certainly help solve the KYC issue in some way. *[Note from the Author: RSA signature verification through an Ethereum smart cont Continue reading >>

Oraclize In Studio Ethereum Studio Ide Manual

Oraclize In Studio Ethereum Studio Ide Manual

Yes, now you can use Oraclize directly from within Ethereum Studio's IDE. Detailed instructions can be found in the Ether.Camp blog article . The following screenshots will show you complementary info to get you started with Oraclize in the IDE. 1.The Oraclize github example tells where to edit the ethereum.json to include the plugin config (see item [1] in screenshot above). 2.Then copy the oraclizeAPI.sol source to your contracts folder [2]. 3.Edit your project contract Solidity file to 'import' the oraclizeAPI.sol (see item [3] in screenshot above).-make sure the folder path corresponds to your project's contract folder location. If you keep a libs folder for imported .sol files eg. then import "lib/oraclizeAPI.sol"; In the workspace above it's simply import "oraclizeAPI.sol"; since the contract and the imported .sol are in the same folder. 4.You may run your project contract.sol [4] 5.Note the new plugin tab . Click on that and the Oraclize panel appears. and 6.Now you can test queries in either manual or live mode (auto) 8.and a pop up appears allowing you try out Oraclize with a specific URL, Wolfram formula, or BTC blockchain queries. 9.Try 'Random', and surprise yourself with the possibilities of this awesome utility in your Dapps. Continue reading >>

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