Because of this issue, the concept of light clients was developed. Such a light client, in the case of ethereum only downloads block-headers and verifies a lot less. This concept has been working ok for BitCoin in the past and is one of the things which successful blockchain-platforms seem to need at some point.
In the ethereum space however, this is, at the time of this blog post, an experimental feature. Most prominently there is status , who wrote their own wrapper of go-ethereum. I also found walleth , which is a new project and a Kotlin-based light client using the cross-compiled Android package of go-ethereum.
This cross-compiled package is what I will also use in this blog post, as it seems to be the suggested and most standard way of approaching this problem at the moment. As usual in the ethereum world, there is little to no updated documentation available, adoption of the mobile wrapper seems to be very limited - which means very few examples.
For setting up the react-native application, I usually use create-react-native-app and eject immediately. This gives us a working, debuggable application which can be started using npm run android. The first step is to set up the react-native app to be able to communicate with native Java code. Initially, we create the following TestNative. Then, we need to put this module inside a package - in our case TestPackage , right where TestNative lives:. This is just some boilerplate for wrapping our module.
This package is then registered in the MainApplication. After creating and registering our native module, we can call it from react-native. First, we create a file called ETH. This component just renders a button, which, upon pressed, calls NativeModules. The callback just alerts the returned string, so we see that passing values between react-native and the android module works.
The second step is to get the go-ethereum wrapper to run a light client inside our app. First, we need to add the dependency to the geth-wrapper, the go-ethereum android wrapper to build. Now, in MainActivity. In any case, the node is created and started in the main activity and then, in this case, shared through a global state object called NodeHolder :.
First, we create a NodeConfig , which is the configuration object for the light-client. We can configure the network we want to use, the genesis block and many other things. In our case, we just take the default main network.
Then, the node is created with a file-path. In this path, the node will save all of its files blockchain-state etc. Then the NodeHolder singleton is created and the node is set. There is some more documentation on accounts available. If you start the application at this point, the node should start and you should see something like the following in the Android Monitor console:.
Now, to connect our react-native app to the Geth node, we simply use the reference shared in NodeHolder within our TestNative module:. First, we get the node and account from the global state object. Then, we create an EthereumClient for the node - this client is then used to interact with the node in a similar way as, for example, web3 would. With the ethereum client instantiated, we simply query the balance of some address and send it back to react-native together with the address of our created account.
If querying a balance works, it means we are communicating from react-native with our running light-client. That means we can also execute other actions such as interacting with contracts or sending transactions. What I mean by It works! You can find the full code of this simple example here. If you start the application, it takes some time sometimes minutes… until it connects to other nodes and starts syncing.
The syncing itself takes quite a while as well, so this is nothing which you can expect to work out of the box. Running geth normally from the console does not cause this. No etherbase set and no accounts found as default you not active account. It must be related to send stdout to another console, where the console is managed by screen. How can i get Ether for this testnet?
EuLeEr maybe you can mine yourself? Andres Junge. EuLeEr I'm running the same issues. Jim McDonald. But that's the official faucet. I know mcdee. It used to work for me. But right now it seems not to be working. There is a limit to how much eth it will give you, I believe.
Geth is mining software or different sir. Clay Kohut. I'm trying to use Geth. Does anyone know how to start a light geth node using the swift framework for iOS? I can't figure out how to open the RPC endpoint with swift. I understand that by setting a gas Price below 20 Gwei will be a disincentive for miners to include that tranaction in a block.
The Blockexplorer for this tranasctions shows a pending time of over 47 mins now. I have used the same account for two other seperate transactions. Is it the case that this account is now tied in limbo until the first transaction is mined? Will these pending transactions time out or will they eventually be mined? If i understand correctly a contract will be executed by machine where is deployed and that node is defining the gas cost.
It is correct? When you submit a transaction it goes in to a transaction pool. Mining nodes in the Ethereum network take transactions from the pool and execute them. The transaction will have the same gas cost on every node that executes it.
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Cryptocurrencies are always exchanged at market price. Say, your payout threshold is 0. You accumulate 0. The pool sends your 0. As a result, you get the equivalent of 0. Say, you earn 0. We know that many users mine directly to an exchange. Exchanges often have a deposit threshold. For example, a minimum deposit on Kraken is 0. That is why we set a threshold for payouts in NANO in the pool: the equivalent of 0.
Even the weakest GPU that mines Ethereum can accumulate the required minimum in one day. Payouts are processed once a day at UTC. Payouts are not instant. Considering that your ETH must be transferred to an exchange, exchanged, and then transferred back, the whole process usually takes no more than two hours allowing for small delays. We plan to process the payouts more than once a day in the future. The whole process is completely transparent.
After the pool issues a payout and even during the payout process , you can monitor the operation status of an exchange system, check an exchange rate, track your money from the moment ETH is sent to exchange to the moment you get NANO. We made Bitcoin mining on GPU a reality. Payouts are issued once a day at UTC. The whole process usually takes no more than two hours allowing for small delays like waiting for exchanged BTC withdrawn from an exchange.
When miners get payouts from our payment gateway, they pay only a part of the transaction fee in the Bitcoin network. We group all miner payouts in one transaction. The transaction expenses are then divided between the miners in equal parts. All other fees are covered by the pool, including the fee for sending ETH to an exchange and the fee for withdrawing BTC from an exchange.
After the pool issues a payout and even during the payout process , you can monitor the operation status of an exchange system, check an exchange rate, track your money from the moment ETH is sent to exchange to the moment you get BTC. The pool will take care of all conversions with minimal fees. The principle is simple: when you enter your wallet address you need to use your Bitcoin or NANO address.
We remind you that RaveOS is absolutely free if you mine in 2Miners pool. First, select your preferred mining client and then set up the simple configuration:. Please pay attention that when you add the wallet address you select the ETH Coin. If you mine Ethereum in the 2Miners pool, you can choose one of three cryptocurrencies for payouts: Ethereum, Bitcoin, or Nano. The minimum payout in Ethereum is 0.
Payouts in ETH are issued within two hours after you reach your payout threshold. No special setup is needed to use auto-exchange. We might also add auto-exchange for other cryptocurrencies in our pools in the future. We are looking forward to your feedback in our Telegram chat and on Twitter. We want our users to get payouts for cryptocurrency mining as easily as possible.
Thank you for choosing us! Join our Telegram community and remember to follow us on Twitter to get all the news as soon as possible. The 2Miners pool co-founder, businessman, miner. In started mining cryptocurrencies and built many rigs on his own. If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold.
The best setting tends to differ from language to language. See codeclimate-duplication 's documentation for more information about tuning the mass threshold in your. Similar blocks of code found in 10 locations. Consider refactoring. Close Duplicated Code Duplicated code can lead to software that is hard to understand and difficult to change.
The Don't Repeat Yourself DRY principle states: Every piece of knowledge must have a single, unambiguous, authoritative representation within a system. Tuning This issue has a mass of Duplicated Code , p
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