All Questions

18
votes
0answers
412 views

E/Go: fatal error: thread exhaustion

I am experimenting with the geth-android library with light-client and in-process node from @karalabe. I could successfully sync with the testnet node from @phonikg, unfortunately this one is down now....
9
votes
0answers
345 views

Peermanager is unable to connect to nodes

I'm following this guide and am trying to create a private network with its own block chain and peers. I managed to install docker following this guide (I'm using a debian 8 jessie virtual machine) ...
8
votes
0answers
1k views

Geth 6.2: miner.start() returns null and miner's hash-rate drop for all miners down due to the update

On Geth Version: 1.6.2-unstable miner.start() returns null, it used to return number of processes assigned. Is it normal? miner.start(num) num identifies the thread number? > miner.stop() true >...
7
votes
0answers
782 views

How to implement the ERC777 token standard?

Does anyone know how to correctly implement the new ERC777 token standard? I've been trying to create an ERC777 contract (see code below) but keep struggling with a couple of things. According to ...
7
votes
0answers
762 views

What are the average transaction propagation times in Ethereum for reaching 50% and 95% of nodes?

What are the average transaction propagation times in Ethereum for reaching 50% and 95% of nodes? That is, once a transaction is generated on a given node, how long does it take on average to reach 50%...
7
votes
0answers
797 views

getBlock('pending').transactions vs txpool.status.pending?

I logged both getBlock('pending').transactions.length and txpool.status.pending while the Aragon ICO was ongoing. I'm interested in seeing transactions as they are coming to my node. The two graphs ...
7
votes
0answers
451 views

Installing go-ethereum nodes using docker swarm?

Has anybody installed and configured go-ethereum nodes using dockerswarm ? Appreciate if anybody could share any docs or relevant information.
6
votes
0answers
207 views

What happened in the Ropsten hardfork from Byzantium to Constantinople?

What were the consensus issues during the Constantinople hardfork in the Ropsten testnet? One noted consensus issue is: geth and parity have been in noticeable disagreement regarding block ...
6
votes
0answers
126 views

Quorum: Extending list of participants that can access private transactions post transaction creation?

According to the Quorum roadmap (which is over a year old now) the team at JPM was planning to add a feature whereby additional parties could be given rights to view private transactions after those ...
6
votes
0answers
172 views

How to start geth for whisper only without blockchain stuff?

I'm writing a chat app on top of Whisper; the app is supposed to manage the lifecycle of the Ethereum node. One way to build to is to use wnode in the background & communicate with it using ...
6
votes
0answers
199 views

Truffle debug on function call show null variables

With a truffle version of 4.1.0, using truffle debug on a call of my contract function below: function Deposit (uint256 timeout, bytes32 hash, address recipient) public payable returns (...
6
votes
0answers
180 views

Error importing transaction: Transaction(InvalidChainId) in Private POA

Problem I am trying to send some transactions to my private chain, and all transactions are getting failed. I am receiving this error: Error importing transaction: Transaction(InvalidChainId) ...
6
votes
0answers
264 views

eth.gasPrice is returning less value than expected

As mentioned in documentation eth.gasPrice returns the current gas price. The gas price is determined by the x latest blocks median gas price. I was relying on this method to estimate current gas ...
6
votes
0answers
127 views

EthereumJ IO Error Too many open files

While using EthereumJ: SocketException or leveldb.DBException are thrown: leveldb.DBException: IO error: /data/bitgo/database/state/549361.ldb: Too many open files
6
votes
0answers
341 views

testrpc 2.0.0 - cannot find module 'memdown'

Trying to get testrpc (2.0.0) working on an ubuntu virtualbox, and getting this error when I run it: mowliv@u4:~$ testrpc module.js:341 throw err; ^ Error: Cannot find module 'memdown' ...
5
votes
0answers
26 views

ELI5 what are erasure codes?

Reading this article, I understand that erasure codes are a potential solution to the data availability issue in sharding. That is, a light node can have higher certainty regarding the contents of a ...
5
votes
0answers
150 views

Geth vs Parity Transaction propagation (1 / sqrt(n))

Is there a reason that geth propagates new txs to all peers but parity only propagates txs to 1/sqrt(n) (on average) peers? I see a comment in geth to the effect of //FIXME include this again: peers = ...
5
votes
0answers
368 views

Connecting to remote Geth client from AWS hosted server via web3 needs fix

There is a general problem that is affecting most everyone who tries to initialize AWS hosted servers with a remote Geth instance. It would be great to have documentation to address a fix or at least ...
5
votes
0answers
372 views

Error: missing trie node 60c376cdb14aec… (path)

I'm trying to start a geth node to connect to the Rinkeby test network by running geth --networkid=4 --datadir=$HOME/.rinkeby --verbosity 0 --syncmode=light --bootnodes=enode://...
5
votes
0answers
569 views

Verify the ownership of an ethereum account

I have built a web game where users can purchase virtual items for their avatar with tokens obtained during an ICO. What is the best solution for delivering the items to the correct web game user? I ...
5
votes
0answers
289 views

Difference between Ethereum Consortium Blockchain template and STRATO Blockchain Individual Instance template in Azure

I have recently started analysing Blockchain as a service and found it's very interesting. But, I am not able to interconnect these information's. What is difference between Ethereum Consortium ...
5
votes
0answers
69 views

Will forthcoming ability to make transactions private hide gas usage and mining information?

I understand that people are working on allowing for more private transactions on the public Ethereum mainnet. This would involve hiding (at the very least) the from, to, value and probably input ...
5
votes
0answers
154 views

Dapp Development using Truffle framework getting error

I am using truffle framework, which has pudding functionality. I have compiled the same contract on the both Dapps and deployed it on the one Dapp. Now i am trying to access it from another Dapp using ...
5
votes
0answers
1k views

How to install the Python bitcoin module on windows for presale wallet import?

I've been holding Ethereum since the pre-sale. I want to continue to just hold my presale wallet because its safe as cold storage (rather than importing into my wallet). However, I want to be able to ...
4
votes
0answers
31 views

Get all transactions by recipient's address on a light client

I would like to continuously get the transactions sended to a specific address while using a light client. I underscore that I am talking about regular transactions, not the contract invocations. As ...
4
votes
0answers
409 views

Bootnode public address

I am trying to deploy an small private Ethereum network using geth. I have a server running geth configured as a miner in my local network. In the other side I have a droplet in DigitalOcean that I ...
4
votes
0answers
157 views

How to get Truffle to generate artifacts for contracts outside of project?

Say I have a contract MyToken.sol which has already been deployed to a public Ethereum network. Its source is maintained in an external repository and is included in my package.json file so that it ...
4
votes
0answers
103 views

Running a geth light client, how do I resolve the error: “No trusted canonical hash trie”?

I've been running a geth light client to deploy smart contracts through Truffle Migrations to mainnet. I'm getting: "Error: No trusted canonical hash trie". Any help in what this entails and how to ...
4
votes
0answers
201 views

eth_getTransactionReceipt returns null only sometimes and only on my node, tx is successfully mined in

I'm having this strange problem and it may be related to the way my node is configured. I'm making calls to both infura and my own nodes like so: {'id': 123, 'jsonrpc': '2.0', 'method': '...
4
votes
0answers
113 views

How to change Geth PoA Clique block sealing time?

I have used puppeth to generate genesis file in which I set sealing time to 30 seconds. I have set up one miner. Now, I want to change the sealing time to 5 seconds. How can I do that on same ...
4
votes
0answers
148 views

Three related hypothetical security flaws in Casper: does the protocol allow them?

Casper attempts to solve the problem of "catestrophic crashes", where validators with more than 1/3rd of the voting weight go offline and thereby stop any more blocks from being validated, by using an ...
4
votes
0answers
119 views

Is it possible to trace a function call hitting revert?

It is possible to trace a transaction with debug_traceTransaction. But it needs the transaction hash, requiring it to be a transaction in first place. I'm debugging a function call that generates a ...
4
votes
0answers
210 views

Truffle hangs forever with parity with PoA

I'm trying to create a private chain using parity (PoA) and truffle but when I do truffle migrate it hangs forever with the following output: > [ > { > "jsonrpc": "2.0", &...
4
votes
0answers
251 views

How to use Ethereum precompile bn256Pairing to check equality on symmetric groups?

The address 0x8 contains bn256Pairing pre-compiled contract on Byzantium release. I have the following questions : If I have G_1 = G_2, i.e., a symmetric pairing, is it possible to check e(a_1, b_1) ?...
4
votes
0answers
257 views

Why is web3j java not generating correct return types for my contract

Here is my contract: pragma solidity ^0.4.17; contract SignVerify { function recoverAddr(bytes32 msgHash, uint8 v, bytes32 r, bytes32 s) returns (address) { return ecrecover(msgHash, v, r,...
4
votes
0answers
173 views

Benefits of library versus a plain contract (upgradeability)

I'm trying to find what the benefit is of a library. I found the following statements. (Please correct me if i'm wrong) Cost less gas to deploy Uses the storage of the calling contract the library ...
4
votes
0answers
447 views

How can I retrieve transaction hashes using web3 batch requests?

When I send a transaction using Truffle's contract wrappers - or using plain web3 sendTransaction() - I get a tx hash back that I can use to confirm the tx has completed. While using batch requests (...
4
votes
0answers
105 views

Autorefill isn't working on Improved Coin code

I've been trying to write a token contract with the autorefill function, but perhaps the code for the token example on the ethereum website is somewhat outdated, because it isn't working. Did anybody ...
4
votes
0answers
765 views

ethminer fails to allocate DAG buffer -only- when connecting to a pool

When I run ethminer -G it starts the miner as expected. It takes around 60 seconds to allocate the DAG, and then it starts pumping out hashes on the GPU (at a dismal 1MH/s but that's besides the point....
4
votes
0answers
217 views

how to get revert at the previous timestamp of evm in testrpc

I am testing my contracts so at some point i need to increase the timestamp of evm that i achieve through evm_timeIncrease but now i want to execute some functions on the basis of current timestamp ...
4
votes
0answers
553 views

How to update the Ethereum Wallet Solidity Compiler

I'm using the latest Ethereum Wallet version which is 0.9.0 and I want to update my latest Solidity compiler since it seems that the wallet is using this version 0.4.13+commit.0fb4cb1a.Emscripten....
4
votes
0answers
316 views

API resource for determining all address holders of a contract

I would like a RESTful API for viewing all addresses which holds a balance of a specific contract. It seems that etherscan.io deprecated this feature, or I'm looking at the wrong endpoints Are there ...
4
votes
0answers
277 views

How can I use a Presale JSON file to keep my ETH long-term in cold storage and sell my ETC seperately?

I received Ether during the Pre-sale in June 2014 and received a JSON file and have the password. I have never tried to access these funds. I found out that I should have ETC & ETH due to the hard-...
4
votes
0answers
392 views

Managing multiple Ether addresses in one contract?

Although I have a background in Bitcoin (creating the WLOX exchange platform), I am completely new to Ethereum. I am trying to find a way to manage multiple accounts/addresses as a pool to (1) be ...
4
votes
0answers
212 views

Geth LES Client. Only synchronize the last 50 headers?

Using a LES client, is it possible to only synchronize only some of the last headers on first run ? I am not interested in the chain history. I understand the security implications of not validating ...
4
votes
0answers
126 views

I am using Embark , i wrote a command 'make geth' it throws the error

make: *** No rule to make target 'geth'. Stop. I don't know what does it mean .
4
votes
0answers
258 views

Contract execution fails with Web3 but works with Remix

I am dealing with a very simple smart contract: contract MyRegistry { struct MyEvent { string date; // yyyy/mm/dd string desc; // potentially long string uint count; // &...
4
votes
0answers
254 views

Why are there discrepancies between client message signatures?

I have been investigating message signing using an Ethereum account, and have become somewhat bemused by the different signatures that I receive from different clients and different libraries. I have ...
4
votes
0answers
241 views

How to change block's current time in testrpc

I created a smart contract, in that i'm assigning now to particular value. uint raisedtime=now; EmitNow(raisedtime); //event function. It return the unix timestamp of vary old date. How to change or ...
4
votes
0answers
53 views

EVM Invalid JUMP when using webpack app

I am creating a frontend app based on Truffle + Webpack, following this tuto : http://truffleframework.com/tutorials/building-testing-frontend-app-truffle-3, and have no uderstanding of JavaScript at ...

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