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Ethereum Data Feeds

Crypto Data Feed Platform Santiment Plans Ico Token Sale With 45,000 Eth Cap

Crypto Data Feed Platform Santiment Plans Ico Token Sale With 45,000 Eth Cap

Crypto Data Feed Platform Santiment Plans ICO Token Sale with 45,000 ETH Cap Join our community of 10 000 traders on Hacked.com for just $39 per month. Santiment, a crypto data feed platform for the blockchain and crypto industry, has announced a three-stage token sale beginning July 4, the first Cofound.it token sale. The token sale, The token sale, which will have a minimum threshold of 15,000 ETH and a maximum cap of 45,000 ETH, concludes on Aug. 6. The Santiment data feeds platform shows the true state of the crypto-markets, providing content streams and a transparent database. It is the first project guided by Cofound.it, a distributed platform for startups planning crowdsales. Leveraging the expert guidance of the Cofound.it team and the companys innovative Priority Pass mechanism, Sanitment is confident in hosting a substantial token sale that will help us deliver the market sentiment and blockchain activity platform that the crypto community has long demanded, said Maksim Balashevich, Santiment founder. With the support of the community and Cofound.it, Santiment will be the financial market data and content platform of choice for cryptocurrency and blockchain space, analogous to the role that Bloomberg and Thomson Reuters serve in traditional financial markets, Balashevich said. Its long-term goal is to serve as the market data infrastructure for cryptocurrency and the blockchain economy. Jan Isakovic, CEO and co-founder of Cofound.it, said Santiment represents the first a select few startups to pass Cofound.its selection process. By creating a transparent database of projects, Santiment provides investors a way to identify and avoid untrustworthy crowdsale projects. Combined with objective data feeds and expert-curated content, the solution provides subscriber Continue reading >>

Introducing Oracul: Decentralized Oracle Data Feed Solution Forethereum

Introducing Oracul: Decentralized Oracle Data Feed Solution Forethereum

Introducing Oracul: Decentralized Oracle Data Feed Solution forEthereum While building Ether Wager (Decentralized Contract for Difference Exchange, Kovan testnet), I faced a problem of choosing an oracle for assets price feeds. Fortunately, we have Oraclize , which brings the data from a consumer-specified API to a smart contract. But which API to select? Am I in position to choose a particular one? And, more importantly, can there be just one centralised service which all the traders would agree on? In fact, this issue was faced by a number of Ethereum projects. Shapeshift built a custom centralised price feed for their exchange Prism. MakerDAO implemented an oracle controlled by the teams multisig for their first stablecoin Sai. The oracle is often the only centralised unit of such systems. Prediction markets, such as Augur and Gnosis, can theoretically be used as price feed providers. In practice, however, its unlikely to be feasible soon due to the overhead added by the generic nature of these projects. In 2014 Vitalik Buterin described a SchellingCoin concept, addressing this very issue. The basic idea is that every participant reports a value, and the median is taken as the oracle result. All the reporters should provide a deposit along with the report, and the deposits are redistributed in favour of the values that are closer to the median. Thus, its in the reporters interest to post values that are similar to what others report. The only obvious common point ( Schelling Point ) is the actual true value, so the median is expected to be close to the real asset price. The Oracul system is based on the same concept. Oracul system makes use of a domain-specific token (ORC). It acts as voting power when reporting values and as stake size when distributing commission. Continue reading >>

How Ethereum Contract Can Communicate With External Datasource

How Ethereum Contract Can Communicate With External Datasource

How Ethereum contract can communicate with external datasource You will face into the problem when your product logic is implemented in a solidity and deployed to Ethereum network should start communicating with outside world. Ethereum virtual state machine cannot communicate with the outside world in the simple and an easy way. Why? Because to approve each block-chain BLOCK validity, all mining nodes should get the same results from the outside. And it is not an easy task to deal with that. After some time of research I will try to summarize my findings. There are two ways how this can happen: Pull way or Push way. To use this method you should trust 3rd party solution like Oraclize . This service is not free and you should pay them for all magic they do. Usage is a really simple example : function __callback(bytes32 myid, string result) { if (msg.sender != oraclize_cbAddress()) throw; - Easy and fast to use, no need to think about implementation. - Fixed cost. Gas spending will always be the same because they will call your contract __callback after they form the response (if the call is successful). - Oracle query can reach only this public API, that means that no data security available here. All data provided for contracts or published to Ethereum block chain instantly is public. It is a problem if you are working with sensitive data and don`t want to give the public access to your API. - Full trust of Oracle. If Oracle gets hacked, your __callback calling can happen unexpectedly. - Only the success case is covered. Not a lot of space to handle failures. - Unclear how and who will pay for __callback execution. - Open up data only needed for your calculations logic. - You can control all process, no 3rd party components. - More easily to track various communication Continue reading >>

How Can An Ethereum Contract Get Data From A Website?

How Can An Ethereum Contract Get Data From A Website?

How can an Ethereum contract get data from a website? What is the process/workflow behind the process where an Ethereum contract gets some data from a website? There are some code examples here as well as the documentation of our Solidity API . Oraclize is available both on mainnet and testnet so poking around with it should be easy, however if you need any support feel free to ask - we even have a gitter channel here . As you can see fetching data from a website is as easy as using the oraclize_query function. Our good behaviour is granted by the TLSNotary proof and can be easily checked with this web based client-side network monitor . For example to fetch the ETHXBT price from the Kraken ticker: import "dev.oraclize.it/api.sol";contract KrakenPriceTicker is usingOraclize { string public ETHXBT; function PriceTicker() { oraclize_setNetwork(networkID_testnet); oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS); oraclize_query("URL", "json(} function __callback(bytes32 myid, string result, bytes proof) { if (msg.sender != oraclize_cbAddress()) throw; ETHXBT = result; // do something with ETHXBT }} I had no idea someone was already using TLS Notary for this. Needless to say - mind blown. If you're doing this right, it should allow for trustless information to be passed onto the Ethereum network. (Trustless as long as you trust the server.) linagee Jan 20 '16 at 17:38 Are there plans to open source Oraclize? (The core software, not the interface.) linagee Jan 20 '16 at 18:51 We are planning to opensource many of the tools we are building at Oraclize, but there is no plan to opensource our internal engine Thomas Bertani Jan 20 '16 at 20:48 I'm full of questions about Oraclize! I asked one of them here . Jeff Coleman Jan 21 '16 at 7:54 @Rmi you can find infos aroun Continue reading >>

Bitcoin Data Feeds Bitstamp Ethereum Discount

Bitcoin Data Feeds Bitstamp Ethereum Discount

Bitcoin Data Feeds Bitstamp Ethereum Discount Bank withdrawal status errors Authentication errors Please update your profile with your FATCA information, before performing withdrawal status checks. Type of the withdrawal request "sepa" or "international". Transfers the desired balance from a Sub Account to your Main Account. Transfer-from-main errors Authentication errors 'parameter': Country codes must be in accordance with the ISO standard use two character Alpha-2 codes. Amount parameter can only be number You have only 'available' BTC available. Account has less 'available' 'currency' that are required to make this withdrawal Ripple deposit Bitcoin Paper Wallet Set Same Change Address Litecoin Price Controversy This API call is cached for 60 seconds. Transfer-to-main errors Authentication errors 'parameter': Request limits Do not make more than requests per 10 minutes or we will ban your IP address. If a Sub Account is making the call, then it is the target Sub Account for the transfer and no further clarification is required. Trades are conducted without fee. Can be called by either the Main Account or a Sub Account, but requires a permission in both cases. The X axis on the graph has been modified to say "maximum purchase fee" instead of "withdrawal fees". Bitcoin Data Feeds Bitstamp Ethereum Discount Crowdsale closes on April 22, Read more about it. Amount parameter can only be number You have only 'available' BCH available. Sorting by date and time: Tickets are selling fast. We strongly suggest however, that you refer to the v2 API for future references. Only one of those parameters can be set API v2 Sell market order By placing a market order you acknowledge How To Send From Coinbase To Poloniex Cobinhood Crypto the execution of your order depends on the marke Continue reading >>

What Would A 'trusted Data Feed' Look Like?

What Would A 'trusted Data Feed' Look Like?

I'm going through the practical implication of smart contracts. Take the white paper "Crop insurance" example: "One can easily make a financial derivatives contract but using a data feed of the weather instead of any price index. If a farmer in Iowa purchases a derivative that pays out inversely based on the precipitation in Iowa, then if there is a drought the farmer will automatically receive money and if there is enough rain the farmer will be happy because their crops would do well." The keyword here is 'automate'. If you're not going to have collaterals on everything, you'll need trusted datafeeds. I have two concerns with datafeeds: 1) inaccuracy. I used to head the publishing of APIs for major retailers and have seen discrepancies despite enterprise level security and numerous audits. 2) collusion. it would be relatively straightforward for a 'small time' provider to manipulate the contracts by altering the datafeed. Nevermind insider manipulations for short term gains. Please see realitykeys.com concept for reference - freebase is editable by anyone, yet they seem to 'trust' it. What would make a datafeed genuinely trusted? Continue reading >>

Ethereum Platform For Applications Based On Smart Contracts

Ethereum Platform For Applications Based On Smart Contracts

Ethereum platform for applications based on smart contracts Ethereum is a public blockchain -based distributed computing platform, featuring smart contract functionality. It provides a decentralized virtual machine, the Ethereum Virtual Machine (EVM), that can execute peer-to-peer contracts using a token called ether. Ethereum was initially proposed in late 2013 by Vitalik Buterin, a cryptocurrency researcher and programmer. Development was funded by an online crowd sale during JulyAugust 2014. Ethereum, taken as a whole, can be viewed as a transaction-based state machine: we begin with a genesis state and incrementally execute transactions to morph it into some final state. The state can include such information as account balances, reputations, trust arrangements, data pertaining to information of the physical world; in short, anything that can currently be represented by a computer is admissible.Transactions thus represent a valid arc between two states. Invalid state changes might, e.g. be things such as reducing an account balance without an equal and opposite increaseelsewhere. A valid state transition is one which comes about through a transaction. Formally: where is the Ethereum state transition function. In Ethereum together with are considerably more powerful then any existing comparable system; allows components to carry out arbitrary computation, while allows components to store arbitrary state between transactions.Transactions are collated into blocks; blocks are chained together using a cryptographic hash as a means of reference. Blocks function as a journal, recording a seriesof transactions together with the previous block and an identifier for the final state (though do not store the final state itself). They also punctuatethe transaction series with i Continue reading >>

Polkadot: How It Could Integrate With 4 Blockchain Networksand Whats In It For Us As Developers

Polkadot: How It Could Integrate With 4 Blockchain Networksand Whats In It For Us As Developers

Slock.it Founder, Blockchain and Smart Contract Expert, Former CCO Ethereum Web 3.0 Revisited Part Three: Polkadot: How it could integrate with 4 blockchain networks and whats in it for us as developers. Disclaimer: all opinions on this blog are mine and mine only. My opinions does not represent the view of any of my employers, investors and/or partners. Last but not least, nothing written here should ever be construed as investment advice. So easy, even an actual five-year-old can draw it (probably not entirely accurate, but great job nonetheless Leonardo! In my previous post , I described what Polkadot was and, perhaps more importantly, what it wasnt. Today I will describe how it works at a high level, and help you understand cross-chain transaction relaying. The more complex aspects of the technology, such as Polkadots POS consensus algorithm and its relay chain specifications will be covered in later posts. Thanks to Peter Czaban , for spending the time imbuing me with his technical expertise and of course to Gavin Wood , for having written a paper thats both clear and concise while allowing me to paraphrase some of his Polkadot riot channel comments. Thanks also to both Rob Habermeir and Edward Thomson for taking the time to review this document. Firstly, heres a quick lexicon reminder: a parachain references any existing or future blockchain connected to the Polkadot relay chain. And a state machine is simply the brains or CPU of any given chain (in the case of Ethereum, that would be the EVM). State machines aggregate then process the changes engendered by each transaction broadcasted on the network. This is why you may have sometimes heard of state transition functions essentially they modify the state of a chain to a new one, taking into account what has been Continue reading >>

Why I Am Advising Status And Smartcontract.com

Why I Am Advising Status And Smartcontract.com

Why I Am Advising Status and SmartContract.com I was inspired by Zooko Wilcoxs blog posts that detail why he is advising Basic Attention Token (BAT) and Tezos to write a post on my official advising roles in the blockchain community. I have agreed to serve as an advisor to the Status team and SmartContract.com team. This blog post is to explain their projects and state why Im agreeing to advise them. Status is a mobile Ethereum OS that manifest itself as a mobile app for iOS and Android. It is a gateway to access Ethereum Dapps (decentralized applications) on a smartphone, an encrypted message service, and is attempting to build a network of community powered services as part of the Status Network. Status recently held a token distribution for the Status Network Token (SNT). SNT tokens are used as a utility to power the Status client with services including governance of the Status client, participation in a Fiat-to-crypto Teller Network, A Decentralized Push Notification Market, and more. Click here for a blog that explains their vision . The Status co-founders have been active participants in the Ethereum community for a long time. They have consistently been very transparent of their product and its history and struggles. Status has pivoted several times on an ideation and software level. That is to be expected of a project that took the risk of dreaming big back in 2015 when Ethereum was in its infancy. Just looking at Jarrads On a technical level Status was one of the earliest projects to integrate a geth light client and is one of the only projects currently using the Whisper communication protocol to handle in app encrypted messaging. If you browse their Github you see a history of contributions and innovative projects that were well ahead of their time (check o Continue reading >>

Daily Price Oracles Brave New Coin

Daily Price Oracles Brave New Coin

Building smart-bonds? A mesh network? A decentralized dropbox? or the first VR chatbot on the Blockchain? Great! But how do you get 'real world' data, like asset pricing or currency conversions, into your Blockchain based Smart-Contract? Use Oracles to make your smart contracts 'Externally Aware' and easily access external data feeds from your Blockchain Application. BNC has collaborated with smartcontract.com to deliver a range of Public & Private Oracles via the Blockchain. Below are some example Public Oracles we built on the Ethereum Blockchain, to fetch the price of various Digital Assets like Bitcoin and Ether. These public oracles provide all smart contracts in the Ethereum network with free access to the daily US Dollar Pricing for a range of Digital Assets as indexed by bravenewcoin.com (BNC). These are End of Day (EOD), Time Weighted Average Prices (TWAP). The prices are derived from tracking each asset's trading across all exchanges globally. Any Ethereum smart contract can query the below oracle's integration addresses for a daily US Dollar Price as indexed by BNC at 00:01 UTC. BNC recommends a custom solution for those wanting to build enterprise grade or mission critical applications, like decentralized derivatives & smart-bonds. Continue reading >>

Standardized_contract_apis

Standardized_contract_apis

NOTE The token API is currently debated as an ERC (Ethereum request for comment) and may be outdated: Although Ethereum allows developers to create absolutely any kind of application without restriction to specific feature types, and prides itself on its "lack of features", there is nevertheless a need to standardize certain very common use cases in order to allow users and applications to more easily interact with each other. This includes sending currency units, registering names, making offers on exchanges, and other similar functions. A standard typically consists of a set of function signatures for a few methods, eg. send, register, delete, providing the set of arguments and their formats in the Ethereum contract ABI language. The standards described below have sample implementations available here . All function names are in lower camelCase (eg. sendCoin) and all event names are in upper CamelCase (eg. CoinTransfer). Input variables are in underscore-prefixed lower camelCase (eg. _offerId), and output variables are _r for pure getter (ie. constant) functions, _success (always boolean) when denoting success or failure, and other values (eg. _maxValue) for methods that perform an action but need to return a value as an identifier. Addresses are referred to using _address when generic, and otherwise if a more specific description exists (eg. _from, _to). Transferable Fungibles (see ERC 20 for the latest) Also known as tokens, coins and sub-currencies. TF Registries (see ERC 22 for the latest) Token registries contain information about tokens. There is at least one global registry (though other may create more like the global Registry) to which you can add your token. Adding your token to it would increase the experience of the user that the GUI Client can use or not Continue reading >>

Oracles, Data Outside Of The Blockchain

Oracles, Data Outside Of The Blockchain

Tutorials and jobs for Ethereum enthusiasts. Smart contracts requirements may need to do actions depending on results of real world events and dont have any native way to communicate with data on the internet.In the context of blockchains, the oracle pattern is the principle of linking real world data that lives outside of the blockchain to actors living inside the blockchain: mainly smart contracts that consumes data in order to decide which action to take. We published an article that present the basics of what is an oracle and how to implement one for the Ethereum blockchain. In this article youll see different uses cases and where to use an Oracle. We also cover a simple oracle implementation in Solidity that mimic a basic insurance contract on the blockchain. As Oracle can take many forms, our second article explains how to use the Oraclize platform to fetch data from the internet and use it in your smart contract . Our example shows how to fetch the current USD price of Ethereum from a web API. Continue reading >>

What's A Blockchain Oracle? Information Oracles & External Data Feeds

What's A Blockchain Oracle? Information Oracles & External Data Feeds

There are different types of oracles based on the type of use. We differentiate between software oracles, hardware oracles, consensus oracles and inbound and outbound oracles. Software oracles handle information available online. An example could be the temperature, prices of commodities and goods, flight or train delays, etc. The data originates from online sources, like company websites. The software oracle extracts the needed information and pushes it into the smart contract. Some smart contracts need information directly from the physical world, for example, a car crossing a barrier where movement sensors must detect the vehicle and send the data to a smart contract. Another use case is RFID sensors in the supply chain industry. The biggest challenge for hardware oracles is the ability to report readings without sacrificing data security. Oracalize proposes a two-step solution to the risks, by providing cryptographic evidence of the sensors readings and anti-tampering mechanisms rendering the device inoperable in the case of a breach. These provide the smart contract with data from the external world. Example use case will be an automatic buy order if the USD hits a certain price. These provide smart contracts with the ability to send data to the outside world. An example would be a smart lock in the physical world which receives a payment on its blockchain address and needs to unlock automatically. Prediction markets like Augur and Gnosis rely heavily on oracles to confirm future outcomes. Using only one source of information could be risky and unreliable. To avoid market manipulation prediction markets implement a rating system for oracles. For further security, a combination of different oracles may be used, where for example 3 out of 5 oracles could determine t Continue reading >>

White Paper Ethereum/wiki Wiki Github

White Paper Ethereum/wiki Wiki Github

Introduction to Bitcoin and Existing Concepts The concept of decentralized digital currency, as well as alternative applications like property registries, has been around for decades. The anonymous e-cash protocols of the 1980s and the 1990s were mostly reliant on a cryptographic primitive known as Chaumian Blinding. [8] Chaumian Blinding provided these new currencies with high degrees of privacy, but their underlying protocols largely failed to gain traction because of their reliance on a centralized intermediary. In 1998, Wei Dai's b-money [9] became the first proposal to introduce the idea of creating money through solving computational puzzles as well as decentralized consensus, but the proposal was scant on details as to how decentralized consensus could actually be implemented. In 2005, Hal Finney introduced a concept of reusable proofs of work, [10] a system which uses ideas from b-money together with Adam Back's computationally difficult Hashcash [11] puzzles to create a concept for a cryptocurrency, but once again fell short of the ideal by relying on trusted computing as a backend. In 2009, a decentralized currency was for the first time implemented in practice by Satoshi Nakamoto, [1c] [1d] combining established primitives for managing ownership through public key cryptography with a consensus algorithm for keeping track of who owns coins, known as "proof of work." The mechanism behind proof of work was a breakthrough because it simultaneously solved two problems. First, it provided a simple and moderately effective consensus algorithm, allowing nodes in the network to collectively agree on a set of updates to the state of the Bitcoin ledger. Second, it provided a mechanism for allowing free entry into the consensus process, solving the political problem of Continue reading >>

Santiment.net

Santiment.net

SANTIMENT.NET: OFFICIAL SITE ONLY. Beware of scams! Market Datafeeds, Newswires, and Crowd Sentiment Insights for the Blockchain World Join our email community and hear Santiment news first, as it happens Crowd Sentiment Data is Especially Powerful in Cryptocurrency Trading Maksim Balashevich, founder and CEO of Santiment, talks about the current dynamics of ICOs, Bitcoin and Ethereum. Video / Podcast Santiment CEO Maksim Balashevich talks to Dukascopy TV about the years dynamics in crypto and what could come next. Watch on Youtube Todays crypto-markets are driven by crowd sentiment. Hype and fear dominate the price action. Santiment delivers clarity, with market sentiment content and datafeeds that cant be found anywhere else. Stop trading in the dark. Geta regular stream of curated market news and insights, withupdates on blockchain happenings, trends, and sentiment. All available in easy-to-grasp newsletters, articles, and reports, and aggregated from across the web. Never be blindsided by the crypto-markets again Santiment gives you the daily pulse of cryptocurrency and blockchain markets Get exclusive content streams from a network of crypto trading and investing experts Think you can find market patterns, but just need the data to prove it? Are you a quantitative trader, looking to trade at speed and scale? Wait no longer. Santiment bringsyou hard numbers as we build the worlds largest library of datafeeds, specifically for cryptocurrencies and blockchain assets. Access a constantly growing library of blockchain, sentiment, and crowdsourced datafeeds Use our low latency, real-time streams for quantitative trading Connect to our API and let Santiment power your application with cryptos most sophisticated datafeeds Information Infrastructure for a Crypto-Financial Continue reading >>

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