Questions tagged [ether]

Ether (ETH) is the main internal crypto-fuel of Ethereum and is used to pay transaction fees.

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When use Nethereum C# Library there are many CLOSE_WAITs in TCP Stack at node side

When I use Nethereum methods (GetBlockWithTransactionsByNumber,GetBlockWithTransactionsByNumber and etc ) in loop, In TCP stack at node side accumulates a lots of CLOSE_WAIT. How can I fix this issue ?...
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8answers
43k views

How can I check if an Ethereum address is valid?

I've read many times that you should never input an address by hand unless you want to accidentally send Ether into no-mans-land. I'd like to know what those checksums might be. Is there a way to tell ...
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1answer
477 views

Loading smart contract x with tokens; sending eth to smart contract x; receiving tokens for that eth

Hello dear Eth community, I am a complete noob, please go easy on me ;) I am an IT teacher and I want to create a reward system for my class for a game that we play weekly. The game is not ...
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2answers
1k views

How to generate ethereum address derived from xpub in PHP?

How to generate ethereum address derived from xpub in PHP? I am trying to generate ethereum address similar like below link does for bitcoin. https://github.com/blockchain/receive-payments-demos I ...
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1answer
389 views

Why is the units of gasUsed in the transaction receipt 10^11 Wei?

I'm checking the balance of an account after a payable transaction in a Truffle test. Below is my code: // amount is the value supplied to the txn assert.equal(Number(String(currentBalance)), ...
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1answer
770 views

Events not being detected in Nethereum

I have a function in one contract that looks like this: //Events event RequestReceived(bytes s); event WorldCreated(bytes32 indexed worldName, address indexed sender, address result ); ...
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1answer
415 views

missing ether after uninstalling metamask

Lost my ether from Metamask when I uninstalled it and it did not show up when reinstalled...but it is showing on Etherdelta with the no private key error in red. How do I recover it please? I'm leery ...
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2answers
41 views

ParserError: Expected pragma

Hi guys. I have got one big problem. When i try to compile my code i'm getting some kind of unusuall error. I think everything is ok but when i try to "node compile.js" my main file ("inbox.sol") ...
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4answers
2k views

Ethereum Wallet on Testnet to mine

I have installed the ethereum wallet on widows. But my account ether balance is 0.00 ether. Then I started mining from developer network(Test only). But it shows nothing, I could not get any ether ...
4
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1answer
722 views

Call write function, which doesn't change contract value

I'm new in smart contracts and faced with one problem. After deploying contract to my test local blockchain network, i try to set new value via setter, after that I call get method of contract and it ...
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3answers
3k views

How can a transaction fail?

Given that a transaction has A high enough gas limit for the transaction to succeed A high enough gas price for it to be mined No contract calls that throws Is there any way that transaction can ...
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2answers
1k views

Ether missing after Etherli transaction, Internal Transaction?

I'm new in this world and already have a problem with my ETH, hope someone can help me.. I used the wallet of ether.li but saw another wallet for my phone. So I did a transaction of 2ETH from Etherli ...
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2answers
333 views

Will not a PoS implementation converge in a much less wealth equally distributed system?

With the current trends of prices in crypto and the long term vision supported by the community (HODL!), the implementation of Proof of Stake could eventually derive in big ETH stakeholders getting ...
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2answers
2k views

API or code to find the current price of a ERC20 compliant token listed on Etherscan

In the web application I am working on , I need to find the current price of an ERC20 token listed on etherscan . How can this be done using code or some etherscan api ? Any help is appreciated.
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3answers
80 views

Response stuck when creating contract

I am creating a contract on my local blockchain network using web3. On my node , contact is created and address is generated. But on node application, response is struck. Here is my node code: ...
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1answer
86 views

problem calling balanceOf from another contract

I try to learn solidity and i have a problem. I've created a base token and i want to call the balanceof method from this token in another contract. In Solidity Remix i get : call to BaseTokenBet....
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1answer
1k views

Computer lagging & low MH/s & stop mining

Hi I am very new to mining and tried using Claymore DualMiner to mine ETH on the Nanopool. I've set everything up, synced the blockchain and generated the config file from https://nanopool.org/ and ...
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1answer
24 views

Best ways to get only “active” in arrays - get group members

let's say I have an group contract where users can join and leave groups. When a user joins a group, his address will be added to members[groupId]. When he lefts, the members[groupId] will be set to ...
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1answer
49 views

Ethereum Private network for Production use case

When I should consider to use Ethereum Private network for Production use case? Can I dictate network difficulty rules and apply permission on such network. Regards Dev
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1answer
51 views

How to view or transfer initial ethereum smart contract balance?

I created a new smart contract token with initial supply and deployed it via MetaMask. Then I added this token into MetaMask but token balance is Zero. Now, My question is when we create a new ...
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1answer
91 views

Decoding Hex value in solidity

I am trying to view values stored on my ethereum contract using ethereum wallet. Currently the values are being placed onto the contract in hex format. Is there a way to decode them on the contract so ...
2
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2answers
464 views

How to transfer Ether to ERC20 token contract?

I have a function that needs to make transfers to a token smart contract as well as personal accounts upon satisfaction of some conditions. function completeSale() onlyOwner public { if (...
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0answers
29 views

PFeast : what’s that token?

While everyone can create a token, this one seems to have attracted a lot of value from third party users (current ether balance place it in the top 500 and with more than 9000 users). By ...
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1answer
46 views

how can I pair my ERC20 token with Ethereum

I am building an exchange and i just want to know how this pairing thing works. How can I pair my ERC20 token with other crypto assets like Ether and BTC?
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6answers
30k views

Insufficient funds for gas * price + value

Sending Address has over 1 Eth in current Balance. Using the Geth console, I can send many transactions of any amount less than .033 eth.sendTransaction({to:'...
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1answer
239 views

Ethereum mist wallet not synchronising, not showing Ethereum and folder

I am a beginner at setting this up and I used a youtube tutorial to download Mist. The problem is it's not syncing the blockchains. I've tried to debug this by going to users/appdata and inside the ...
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2answers
831 views

Start Mining with Mist

Initially, the regular sync would not download the last 200+/- blocks or so. I was told to switch to light sync where it finished. I then read that to start mining real ether on the main network, I ...
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1answer
99 views

how to find if a Tx hash is in pending state in ethereum mainnet after web3j fastTxMgr timeout

I am using QueuingTransactionReceiptProcessor() with callback accept(). DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH is 10 and POLLING_FREQUENCY is 15000. That gives nearly 3 min wait for network to ...
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1answer
22 views

call contract function without a fullnode?

I have a contract that I deployed a while ago. My mist is like 6 months behind and I don't even think I have enough HD space for it to catch up. I can still launch it anyway to get contracts and ...
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2answers
3k views

How can I get notification from geth when I receive ether?

I'd like to get notification from geth when my account receives ether. I'm thinking to type api command eth_getBalance in every minute, in order to check if my account receive ether or not. However, I ...
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1answer
34 views

Why my tokens aren't visible to the address sent in etherscan?

I've flattened the code and fixed the warning. But the problem with the contract is that the tokens are not visible in the addresses when searched with etherscan but when I try to add through Metamask,...
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5answers
8k views

How do I “Buy” tokens on the Rinkeby (test) environment?

This is a noob question I presume. I just started with the Ethereum Wallet. No previous bitcoin experience. I have 0 ether. Can I start "playing" with the test environment ("Rinkeby" network as I ...
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2answers
51 views

Auction contract privacy

I have an auction contract, where bidders bid with Ether then me (owner) select which offer is most suitable and thus this bidder is contract winner. Once the winner is selected, I send him data as a ...
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2answers
80 views

Can I download all transactions into EOS ICO as a excel file?

I would like to download all transactions into EOS ICO as an excel file. I know etherscan provides this service but it only allows me to download 2000 transactions. But the transactions into EOS crowd ...
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1answer
62 views

Relationship with smart contract and block confirmation

I have known Bitcoin need 6 blocks for confirmation. However, In ethereum, It is different depend on clients By this post What number of confirmations is considered secure in Ethereum? It takes ...
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1answer
29 views

Cryptocurrency payments in Centralized Architecture

I'm new to cryptocurrency, so not sure if I'm asking the right question on this... I want to develop a game with traditional centralized client/server architecture, probably java application server, ...
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3answers
1k views

Difference between Javascript VM vs injected w3 vs web3 provider

It is related to remix ethereum browser. I am wondering what is the difference between them. I think Javascript VM is just test network environment where you do not need any ethereum to test. How ...
0
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1answer
47 views

How will I determine the number of nodes required to run my private Blockchain Network stable?

I am designing a use case where millions of users will be using it and is expecting a transaction rate of 50 per second. I am looking forward to have it on Azure.
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0answers
14 views

Is it legal create an algorithmic trading cryptocurrency fund for social groups around the globe to pool in their money?

Is it legal create an algorithmic trading cryptocurrency fund for social groups around the globe to pool in their money? What is the viability of this project in terms of regulatory compliance?
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3answers
2k views

Go Ethereum - get the enode before starting geth

I need to get the enode of my geth nodes before I start them up.. is there any way to do this via a command other than actually starting up the node ?
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1answer
42 views

If I create an ERC-20 token and accept dollars from people in exchange of my ERC-20 token, would this be an asset-backed token?

If I create an ERC-20 token and accept dollars from people in exchange of my ERC-20 token (with 1 token per dollar), would this be an asset-backed token or a security token? The idea is to create an ...
1
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1answer
258 views

How to split funds in single send transaction

Scenario: Alice Account = 2 ETH Admin Account = 0 ETH Bob Account = 0 ETH Alice wants to send 1 ETH to Bob using my application. Application will charge 0.01 ETH as it's commission and will be ...
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1answer
43 views

Connecting my Golang Backend server with Metamask

I'm trying to build a Ticket-Office project in one of my courses at the University. The project uses a backend server (which I'm writing in Golang) and it should be able to deploy and use smart ...
2
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1answer
37 views

How to detect coin transfer from transaction

This is my transaction data. How to detect transfer coin from it (eth, bee, binance coin,...). Thanks. { "status": 200, "title": "OK", "description": "Successful request", "payload": { "...
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1answer
24 views

Creating an ERC20 Token on Rinkeby - Can't get the right supply

I'm creating an ERC20 token on Remix and using EIP20.sol from Consensys. I'm using this video tutorial as a guide - https://www.youtube.com/watch?v=d5EipPVafsA It's been helpful, however I have one ...
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2answers
39 views

Does price of smart contract execution raise with price of ethereum

I can't determine properly whether higher price of ETH means smart contracts will also cost higher(in fiat not eth) and is it reciprocal, like if we have a SC deployed and eth price raises 10x, will ...
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1answer
23 views

How did cryotokitties create the image of the cats?

For cryptoKitties, the images of the cats are based on gene, for example, color, curve type etc. and the image of the cat will be created, how does the image created, it is by programming running ...
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0answers
20 views

Ethereum, eth_getBalance always give 0 for the latest transaction on fast syncnode [duplicate]

I started syncing ethereum core on --syncmode fast on July 5th, 2019. As far as i know and read, fast mode will sync the latest blocks and transactions. Then yesterday, I did one transaction of X ...
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1answer
120 views

Private key use cases in ethereum blockchain while transferring the amount between two crypto exchanges

I was studying about the application of public & private key in cryptography. I've worked on MetaMask (Ropsten test network) and I know that how to transfer the amount from one account to another ...
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0answers
47 views

ERC-20 Token Transfer Error (Unable to locate Corresponding Transfer Event Logs), Check with Sender

EtherScan.io is showing error: The ERC-20 Token Transfer might have Failed (ErrCode: unable to locate corresponding Transfer event log), check with sender. Transactions are successful and the ...