Questions tagged [blockchain]

The Ethereum blockchain is a distributed database based on the Ethereum whitepaper specification and stores both the full transaction list and the most recent state.

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How can I parse local Ethereum blockchain?

I need to parse live Ethereum blockchain to retrieve all transactions that belongs to particular smart contract's address. So my general question is how can I do it properly? My thought about it so ...
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Bad Block Error: Insufficient balance to pay for gas

I was syncing on full mode on my Ubuntu OS but when I was approaching the nearest latest block, I was shown this error: ########## BAD BLOCK ######### Chain config: {ChainID: 1 Homestead: 1150000 DAO:...
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Ethereum wallet/Geth incredibly slow to sync, help?

So I've noticed some people having the issue similar to mine, entitling their post as "very VERY slow to sync" and other variations of that, however they're complaining at around 100 blocks every ...
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How to manually submit a block to the ethereum blockchain

I'm looking for an API call to submit a block manually to the network. For example a similar call in monero can be found below. https://getmonero.org/resources/developer-guides/daemon-rpc.html#...
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how to get transactions per hour for given ERC20 tokens on blockchain? (preferably with python)

how to get transactions per hour for given ERC20 tokens on blockchain? (preferably with python) Lets say i want to get number of transaction per hour for EOS token.
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Is there an explorer like Etherscan for Remix JS VM sandbox blockchain

I created a contract and did some transactions. I would like to explore the transactions in the sandbox blockchain in my brower (Chrome). But the tx hash is not found in the REMIX VM Debugger http://...
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682 views

The method eth_compileSolidity does not exist/is not available at Object.InvalidResponse stacktrace

I am new to Ethereum. Trying to run a smart contract. I verified the contract content by running it on online compiler. But I am getting an error at the following line of code. var simpleCompiled = ...
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5answers
280 views

Mist / Ethereum Wallet question

I bought a very small amount of ETH on coinbase just to try it, and I wanted to create my own wallet to get it out. However, I've been trying to get Mist working for 3 days and it is always stuck on ...
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244 views

transaction failed - out of gas (How can i return my ethereum and cancel Transaction)

How can i return my ether and cancel this transaction.?? and Ethereum will be return back fund Cryptopia right..?? Transaction link: 0x0991adfb4e316c920f32365b8949e46ae741c055547257e848c6fe92aa308757 ...
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1answer
79 views

Would this make sense as a smart contract application? Trying to understand features and limitations

I'm starting to read up on Ethereum and smart contracts and some questions are popping up in my mind. I can understand that smart contracts can be used, for example, to make a bet for/against the ...
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156 views

State channel implementation

Say I have a data chain, a party is moving data to a party and so on and so on, and I'd like to trace exactly what party touched what data (given my data has an ID). I wouldn't like to store this on-...
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166 views

Python state channel client

Stumbled upon this piece of Solidity code which is an Ethereum payment channel : https://github.com/mattdf/payment-channel How am I to write a Python client that interacts with it over Web3 ? What ...
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76 views

Can't deploy contract as I can't input value into “FROM” field

I'm trying to deploy contract through ethereum wallet . But I can't input value into the FROM field . What should I do?
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593 views

How to connect peers which are on different computers in geth on private network?

I am trying to setup a private network and trying to connect peers. Currently I'm trying it on my laptop and virtual machine(VM) runing on the same laptop (both of them are connected to internet). I ...
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194 views

What is the physical location of Blockchain?

Hello everyone i am new in this technology and i am confused please clear my few doubts. Thanks in advance. Blockchain consist of Blocks but where these blocks are stored, i mean what is the physical ...
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294 views

Build secure private ethereum blockchain with geth!

I have read on the StackExchange how to build a private blockchain in LAN with private IPs and geth clients. As I understood to communicate in lan the geth peers need for P2P communication the form ...
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1answer
300 views

Ethereum Solidity smart contract code Input Output Testing

I have written a solidity based smart contract. I need to test the code on web browser and mobile app. Please suggest the steps what I should do to test and execute the code on - Web browser:- I am ...
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115 views

Anyone hitting the blockchain with Go?

I'd love to switch from JS to Go on our back-end, but the constant development of web3 is such a boon. I can see some web3 wrappers for Gopherjs, and of course it's easy to do direct RPC calls with Go,...
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239 views

Homomorphic Secret Sharing

Speaking of Ethereum blockchain, Is it possible to perform homomorphic secret sharing algorithmic calculations like SSS/pVSS/VSS on-chain? or should this be calculations performed off-chain
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Will Dapps in production be able to buy and use SaaS solutions?

SaaS services help centralized organizations or apps solve their business problems. For example, Google Apps offers startups as an easy solution for company email and document storage. The sales ...
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45 views

Would this three address Ethereum transaction be possible through Geth?

I would like to store an amount of Ether in an specific wallet, likely a wallet generated in Geth. From there I would like to send the correct amount of Ether, I suppose in the form of Gas, or ...
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44 views

Is there a way to halt a transaction from being confirmed until an event occurs?

For example, user 1 sends a transaction to user 2, but that transaction is not able to be confirmed until an event occurs, allowing the transaction to be confirmed and thus sent into user 2's wallet. ...
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345 views

DB - How do I roll back to a block height?

I was informed on this post that I was, indeed, on a fork. My client starts syncing and encounters a discrepancy with my local DB copy. My peers then vanish. In my case, it would be a great hassle if ...
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I have token in eth I'd 0x5ae3876e3f26b6c99895b1ff9e094e6e6992b88b

Please help how can I transfer my tokens from 0x5ae3876e3f26b6c99895b1ff9e094e6e6992b88b to my another eth wallet account at 0xfdC1049162dd014AF7Fb11099DAe8F2A09f330e2.(both are my wallet ids). But ...
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227 views

Event log history is not getting generated ropsten test network

I want to view event log history in my html screen. But I am getting below error in console. Can any one please look into this. I am new in blockchain and this is the first blockchain code I am ...
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276 views

Local ethereum node contain two different blocks but with same height

I am using geth node and found 2 different block with same number eth.getBlock("0x162ae4b189f77ed65d0be270aa8dea08d4e7dcd70432a7d1fd4e6b0fb1b301d6") { difficulty: 1001546728, extraData: "...
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64 views

How do I verify the integrity of my local chainblock data?

If I suspect local data corruption, is there a way to verify that my blockchain data is valid and will not affect my Ethereum work and transactions? Example: I switched to a self-compiled version of ...
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1answer
682 views

What is the best parity configuration to run a full archive node on raspberry pi?

I am using a raspberry pi to download the archived version of the blockchain with parity. I've started parity with parity -d /home/xxx/data/Ethereum --pruning archive --public-node However, the ...
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96 views

Ethereum performance when fetching transactions from blocks

I need to fetch the completed transactions from the ethereum blockchain ledger. At the moment I am retrieving individual blocks in order to fetch the transactions using web3.eth.getBlock synchronously....
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200 views

Can't open ethereum wallet when blockchain is on my SSD

After a lot of searching I found how to set the datadir path to download the blockchain on my SSD instead of my :C/ drive since that's almost full and now that it's downloading the blockchain i would ...
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1answer
127 views

iOS node not syncing with private BKC

I use the Geth framework and Swift 4 to boot a node inside an iOS 11.0 app. This node connects to my local BKC (to 4 nodes to be precise). Here are some tests I made : if I start 3 computer nodes ...
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Setting balance to an account

After i created a wallet for a user i want to modify his balance, how could i do that without setting the account address' balance in the genesis, I'm using quorum blockchain with web3j. Thank you!
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1answer
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liaison entre web3 et nodejs [using web3js and nodjs]

Bonjour, j'ai développé une app avec nodejs et je voulais la transférer vers une dapp en intégrant le web3 librairie. En effet j'ai crée les smart contract il le me reste juste la façon de faire la ...
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115 views

How to test forked block on local machine?

Read this article How can I reliably induce a blockchain fork for testing purposes?. Example from that thread is outdated, and need to be refreshed. First my step is create initial chaindata from ...
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Use-Case: building a small test-network, did I got it right?

I've to implement a simple use case and I'm not really sure if I understood everything correctly. What I'm trying to do is to build up a network with a few Raspberry-Pi's, running as full-nodes. ...
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177 views

How to configure Azure STRATO Blockchain LTS with Visual Studio?

I'm learning all about Blockchain but I wanted to make an example of smart contract, i followed this tutorial, but I can't find much about how to integrate Azure Strato Blockchain with my application ...
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216 views

Ethereum raw data files folder

Where is the folder on Mac OSX where Ethereum put raw blockchain data? I find only *.ldb files, but as I understand it is only the index of full database. For example, in Bitcoin there is blk*.dat ...
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2answers
350 views

Smart Contract - Update implementation using a Relay with delegateCall

I know that smart contracts are supposed to be immutable and that's the whole point, but to expect someone to implement a logic that never changes (no upgrade or no bugs) from day 1 is also ...
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Parity scheduled transaction stuck at submitting

I scheduled a transaction for the BAT token after block 3798640. It remained pending before the block for hours, then submitted about an hour ago, see Tx local viewer screenshot. Anyone know if this ...
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245 views

Is there any benchmark about the speed of blocks search engines?

I want to know the performance of search engines such as blockchain.info, smartbit or blockr.io I know that they are very speed but I want a real benchmark that gives the actual speed (in seconds or ...
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What is a sealer and what is the difference between Ethhash, NoProof and BasicAuthority sealers?

Default sealer in cpp-ethereum is NoProof: https://github.com/ethereum/cpp-ethereum/blob/43bae2c78e2a968ef4eb37bec2da4d9b85fa2392/libethcore/ChainOperationParams.h#L73 But I don't understand what is ...
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Ethereum usage for financial transaction

I am new to ethereum blockchain, and i have following scenario of simple money exchange to be implemented: Consider three account Sender(USD), Receiver(EURO) and Provider. Where provider is account ...
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273 views

private Ethereum Network Uncle Mining: blockchain forked from a node even that node still connected to the network

I have a private Ethereum Network. It was working without any problems when I had a single miner. But when number of miners increase, I am faced with the following problem: The way I have started my ...
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722 views

How to continue to watch the `Events` from the point `geth` was closed?

I have a private Ethereum network. The bootnode(main node)'s goal is to watch Events and if a new Event is generated than trigger a contract's function that I want to run. The key point is triggered ...
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1k views

Is my address valid?

I'm using Blockcypher's API (https://dev.blockcypher.com/eth/#generate-address-endpoint )to generate Ethereum addresses. One such address that has been generated is :- Public Address (...
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What do the progress bars on the Alethzero “blockchain download” window mean?

I'm exploring Alethzero. What do the progress bars in the "blockchain download" window mean? I'm seeing this: I'm assuming this relates to the progress in dowloading the blockchain but I can't work ...
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269 views

How is transaction finality correlated with transacted amount?

It was argued by Vitalik Buterin that transaction security can be a function of the amount the transaction carries. This is because of the economics of attacks. How many block confirmations would you ...
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1answer
154 views

Can someone download and run a local version of my contract?

Say I have a smart contract the preforms a specific function and is used in a decryption process off-chain. Would it be possible for Molly to download the entire contract and run it on their own local ...
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611 views

problem when deploy smart contract in Quorum using web3j

I'm using web3J when i try to deploy contract i get Error processing transaction request: Non-200 status code: &{Status:400 Bad Request StatusCode:400 Proto:HTTP/1.1 ProtoMajor:1 ProtoMinor:1 ...
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PORT ERROR!! Set up a Private Ethereum instance with Geth on MacOS

Hello I am trying to set up a private ethereum instance with geth on MacOS I have a startnode.sh file using ATOM But every time I try to start the node with "./startnode.sh", the http access account ...

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