Questions tagged [synchronization]

Syntonization is the process where your node / client (geth, Ethereum Wallet, etc) receives the most up to date data from the Ethereum blockchain.

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Mainnet sync Broken

I am having a Mainnet on Azure VM which was syncing the network as expected, but mean while after adding Ropsten network syncing on the same VM simultaneously I'm facing problem with Mainnet sync ...
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Delay on receiving block by peered node

Sometimes it takes an around of 25ms to import new block by the other peered node after mined by miner. But sometimes it increases directly around 400ms to import block by peered node after mined by ...
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1answer
669 views

Cannot synchronize two nodes in private Ethereum blockchain

I am trying to build a private testnet with two nodes. This is my genesis block: { "config": { "chainId": 15, "homesteadBlock": 0, "eip155Block":0, "eip158Block":0 }, "...
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1answer
3k views

“retrieved ancestor invalid” message during synchronization

We have been running a private ethereum network for a couple of months. Today we tried to add a new node to the network. When the node was synchronizing, (after 3-4 hours) it stopped with the ...
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1answer
65 views

Who is providing the syncing and bootstraping services on ETH? Do they get paid?

I understand that a node can request synchronization from the network. But who is fulfilling those requests? How are these requests sent out? Are they sent to the entire network or 1 specific node? ...
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1answer
1k views

geth rewinds chain on every startup

I'm using geth to connect to the rinkeby network with fast sync. However, every time I restart geth I receive the following output: Maximum peer count ETH=25 LES=0 total=25 ...
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1answer
282 views

How to give more resources to Ethereum Wallet?

I downloaded the Ethereum Wallet a few weeks ago. Since then it has been syncing with the network (I don't have it running all the time). As today the block download progress is 3.700.000/3.912.000. ...
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2answers
642 views

How metamask works

I want to understand how MetaMask works. When a user connects to the main network using MetaMask, there are a few possibilities I can think of: MetaMask creates a dedicated full node (seems ...
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1answer
316 views

Testnet blockchain sync stuck at Ancestor below allowance

I am expereincing problem while syncing testnet with tail of log: WARN [01-09|06:53:30] Ancestor below allowance peer=1061607032be098f number=1082429 hash=000000…000000 allowance=...
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1answer
453 views

lost private key for MEW . how can i move my tokens from Etherscan [duplicate]

Lost private key for MEW. How can I move my tokens from Etherscan to another wallet or exchange?
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2answers
4k views

Sync blockchain while mining?

I'm new to ether mining. Do I have to sync with the blockchain while mining? Currently I'm using ethminer for solo mining with GPU and geth to sync with blockchain.
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3k views

Web3ProviderEngine does not support synchronous requests while : Running migration: 2_deploy_contracts.js

I am new to all this, spent over 15hrs in the past 24 hrs to deploy based on directions here : https://blog.zeppelin.solutions/how-to-create-token-and-initial-coin-offering-contracts-using-truffle-...
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1answer
412 views

Unable to deploy contract on public chain

I was trying to deploy a contract to public ethereum network using Mist. I was able to send transaction successfully but my transaction is get no confirmations. It has been around 45 minutes and my ...
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357 views

Unable to synchronise with a remote peer

I am running a private network with two geth instances one on my machine and other on an AWS server using the same Genesis file. I am also using a networkid flag to differentiate my private network. ...
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334 views

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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2answers
562 views

Syncing with Mainnet/Ropsten blockchain

If use gethcommand,then the node starts to sync with Ethereum Mainnet by default.If usegeth --testnet --networkid 3 --datadir <testnetdatapath>,then the node will connect to Ropsten. How does ...
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Spoofing of totalDifficulty variable

Péter Szilágyi, in his talk in Taipei, claims that totalDifficulty can be spoofed: https://www.youtube.com/watch?time_continue=575&v=qJA6J0mP73w How is that possible? Can the variable only be ...
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626 views

Total number of state entries

I am syncing my ethereum blockchain using the default syncmode. I want to know how many total state entries are there because currently the highest block is 6544578 and the number of pulled states i.e....
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1answer
136 views

Syncing events on Database - Dealing with blockchain reorganization

My Dapp relies on live events synchronization on a centralized database. There is always a server side script polling the blockchain for new events, parsing then and do the corresponding operations on ...
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1answer
2k views

Synchronisation failed, dropping peer; err=“retrieved hash chain is invalid”; message loop

I have clique private proof-of-authority chain. I have updated all signer nodes' (currently I have 3 signer nodes) geth version to minimum Version: 1.8.16-stable. Also I have updated the other node ...
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2answers
65 views

Transaction rolled back and re-mined later?

A few hours ago, I was testing my dapp on ropsten and something strange happened. I sent a transaction (A), to the blockchain, it got mined and my server synced it. Then 30 minutes later, I sent ...
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1answer
5k views

Optimal sync mode for running an ethereum node that can process transactions

I need to run a local ethereum node, I've downloaded mist wallet but I've had some issues. I have to redownload the whole blockchain again, and I noticed that the problems I had could be related to ...
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1answer
75 views

Retrieving transaction hash in all blocks after fast sync

I have set up an ethereum node using fast syncmode. I want to retrieve all the transaction hashes and the recipient between a range of blocks, let's say 0 - 13000. Will I be able to retrieve the ...
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2answers
491 views

How much faster is it to sync the FULL blockchain with --cache=1024?

Running Geth with --cache=1024 is recommended to be able to sync the blockchain faster (since the default is only --cache=16. I want to have the full blockchain (all past transaction data) so do not ...
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1answer
61 views

How can I upgrade my GETH?

I have an application which is talking to my Smart Contract through GETH RPC. In order to do so, I need to run my own node and sync it with mainnet. The problem start when I need to upgrade my GETH. ...
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GETH gets out of sync from time to time

GETH tooks 6 days to sync, after that it will get out of sync from time to time. (PC is running with SSD, never shutdown, and network availability is 100% with 500mbps connection). May I know how ...
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1answer
129 views

Can someone share your geth export file with me?

I need to setup an archival node ASAP but the download takes around 1-2 block per second. With this speed it will finish in 2 months (if it doesn't stall, but it does, I have to restart it manually ...
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57 views

What portions of the block are validated in Geth's --fast and Parity's --warp mode?

When I am syncing an Ethereum node using Geth's --fast mode and Parity's --warp mode, what portions of the block are being validated as they are being downloaded? I understand that --fast and --warp ...
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358 views

download Ethereum blockchain

the blockchain now has 6,170,500 blocks. To speed up the download I'm using the method at https://mudra.cloud/ethereum/blockchain.html Is this the fastest method? Does anyone know another faster ...
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4answers
26k views

Can I download the whole blockchain from somewhere?

Bitcoin used to offer sharing/downloading a bootstrap.dat which contains the whole blockchain. Are there alternatives to getting it trickling through the peer-to-peer network? Can I just download it ...
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2answers
2k views

Basic Blockchain Implementation: how is the blockchain on a given node “synced” with that on another node?

Here's my understanding of the execution flow of blockchain: Consider two nodes, node1 and node2. Let's say there are 10 users on node1. They're making transactions, but none of these are actually ...
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1answer
586 views

When syncing, the current block is 6154852 and eth.blockNumber shows 0 [duplicate]

I used geth to sync the blocks in mainnet, but the sync last for a long time. eth.syncing shows the current block is 6154852, near the highest block. But eth.blockNumber shows 0. Why does this ...
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1answer
96 views

archive mode very slow

I've a node that I'm trying to sync with: --syncomode "full" --gcmode "archive" in order to address this needing Get a balance of an address at a certain block Unfortunately things became soo slow ...
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2answers
727 views

Blockchain sync on geth stalls at block 1.1 million

I saw the responses on a few issues regarding ethereum and blockchain sync on this site, and was wondering if anyone could help me with a problem I'm facing. I've been trying to sync the blockchain ...
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258 views

Parity - what --tracing and --pruning options use to get all blocks fastest way

I need download all blocks to be able to get all history transactions to create some statistics like mean Ether amount etc. Is it necessery to use --pruning archive and use ~ 1TB od disk? Or default ...
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2k views

How to check sync status

How can I check simplest way am I synced with blockchain? When I executed geth attach command and typed in: 100 * eth.syncing.currentBlock / eth.syncing.highestBlock The outcome sounds about 99....
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1answer
1k views

“being full node” vs.“being sync” : Are they the same?

When we try to be sync using Parity or geth, Does it mean that we are trying to be a full node ? And is it correct to say that: being sync = being a full node = keeping the entire blockchain ?
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can't read past event logs

const event = contractInst.Transfer({},{fromBlock: 0, toBlock: 'latest'}); events.get(function (error, result) { if (!error) { console.log(result); } }); The get ...
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5answers
77k views

How can I get a geth node to download the blockchain quickly?

I'm running a geth node on slow hardware. At the current rate of progress it could be several days before I can download all the blockchain. Is there a way to get it to synchronise more quickly?
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1answer
787 views

Geth Light Sync functionality

If I use the light version of geth sync, can I make a token & deploy contracts using that? The light client "gets only the current state", from that point onwards or everytime I query the ...
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1answer
73 views

Multi node replication

In a multi node network, if one node is down (and a majority of nodes are up and running) for a period of time - say its down at block 100 block and rejoins when the network is at block 200. Q1: ...
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2answers
261 views

Why does the mainnet download take a long time? How can I improve this? [duplicate]

We have been working on integrating a ETH node to our e-wallet to enable ether transactions. We completely build the platform by connecting to a private Ethereum network. Now everything is ready to ...
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1answer
114 views

Is it possible to create batches of transactions without using smart contracts?

Scenario: Suppose that I have to make three transactions simultaneously to Alice, Bob and Claudia. Now the condition is if any one transaction fails the other two must also not go through. Query: Is ...
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Parity create testing transactions and blocks

For test purposes, I would like to make test blocks including test transactions against main net. For example I would like to make a transaction that sends one ether from 0x1234567... to 0x99999999......
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1answer
452 views

How do I tell if initial geth sync is done in 'light' mode on testnet

I just installed geth on Windows 10. Then I did the initial sync in light mode on testnet, and my status is as shown on the screenshot below. I have two questions (related): How do I tell if the ...
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1answer
225 views

Syncmode = full, and still getting “missing trie node”

I'm running on Rinkeby testnet with this command (I resynced the whole blockchain with this): ./geth --rinkeby --syncmode full --rpc --rpcapi "web3,db,eth,net,personal" --datadir /.../ and after the ...
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16k views

How can I empty the blockchain?

I am trying to do a fast sync using geth --fast but I am getting this message: blockchain not empty, fast sync disabled How can I empty the blockchain to allow for fast sync?
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Parity: with 'warp' sync enabled by default, is there still any advantage in using fast pruning?

From Parity Ethereum Documentation: Warp Sync is an extension to the Ethereum Wire protocol, which involves sending snapshots over the network to get the full state at a given block extremely ...
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1answer
131 views

How my node is sync with highest block number of block-chain in which block number transaction have done of some ether? [closed]

I am new to Ethereum block-chain.One question in my mind. I connect geth node to test network with "--fast and --cache=2048" parameters.So my node is sync is after 8 hours.And I successfully deploy ...
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1answer
46 views

Can Raiden Network transfers occur offline?

Since Raiden is off-chain, could I theoretically set up some channels among a group of local parties and conduct transactions offline via NFC, bluetooth, wifidirect, etc.? Since it's off chain and ...