Confirmation - Bitcoin Wiki
After a transaction is broadcast to the Bitcoin network, it may be included in a block that is published to the network.When that happens it is said that the transaction has been mined at a depth of 1 block.With each subsequent block that is found, the number of blocks deep is increased by one.To be secure against double spending , a transaction should not be considered as confirmed until it is a certain number of blocks deep. Note that unconfirmed transactions do not expire . The classic bitcoin client will show a transaction as "n/unconfirmed" until the transaction is 6 blocks deep.Merchants and exchanges who accept bitcoins as payment can and should set their own threshold as to how many blocks are required until funds are considered confirmed.When potential loss due to double spending as nominal, as with very inexpensive or non-fungible items, people may choose not to wait for a transaction to be confirmed, and complete the exchange as soon as it is seen on the network.Most exchanges and other merchants who bear the risk from double spending require 6 or more blocks. There is nothing special about the default, often-cited figure of 6 blocks. It was chosen based on the assumption that an attacker is unlikely to amass more than 10% of the hashrate, and that a negligible risk of less than 0.1% is acceptable.Both these figures are arbitrary, however;6 blocks are overkill for casual attackers, and at the same time powerless against more dedicated attackers with much more than 10% hashrate.  Freshly-mined coins cannot be spent for 100 blocks.It is advisable to wait some additional time for a better chance that the transaction will be propagated by all nodes.Some older bitcoin clients won't show generated coins as confirmed until they are 120 blocks deep. Transactions Continue reading >>
Ethereum: How To Become A Blockchain Developer
Learn how to work with Ethereum, the cryptocurrency for Smart Contracts, a revolutionary technology, home of the cryptokittens, and BTC's main competitor. The CryptoKitties is a Smart Contract that allows users to collect or buy and breed digital cats. If you would like to become a Blockchain developer, sooner or later, you will work with Ethereum. It is the second-largest cryptocurrency at the moment. According to coinmarketcap, its market capital is half the size of Bitcoin and twice the size of Ripple, the third-largest cryptocurrency. Ethereum, like Bitcoin, is a Blockchain solution that provides sharing coins' features. So, why did it become so popular? All the small differences between Ethereum and the first cryptocurrency make it so popular the smart contracts, quickly mined blocks and low fees. Like Bitcoin, Ethereum is a Blockchain solution. The general functional principle is the same currency owners can exchange the funds by sending the transactions which are broadcasted with the decentralized Blockchain. But a couple of differences make Ethereum so special Every block in mined in approximately 10 minutes in Bitcoin. In Ethereum, it happens 4-5 times per minute. Thus, making microtransactions, ordering pizza, or paying for goods does not require one to wait for 10 minutes until the transaction receives the first confirmation. In Bitcoin, the block size is currently specified at 1MB. The Ethereum block size is calculated in a totally different way and depends on the complexity of transactions included in this block. Every block can have a complexity of around 8,000,029 Gas. Every transaction has its own complexity called the Gas and calculated from the code, smart contracts, and information that the transaction includes. Lets say that a single, basic transact Continue reading >>
Where Is My Cryptocurrency Deposit Or Withdrawal?
We understand that time is critically important when it comes to newly deposited funds being available for trading. In an effort to speed this up, Bitfinex offers an expedited deposit process with reduced confirmation requirements depending on your account type. See below for confirmations required per account type. Confirmations are the number of times the cryptocurrency in question must be confirmed by its network prior to being considered valid. The duration a confirmation takes can vary beyond Bitfinexs control due to the design nature of cryptocurrencies and mining. Example: Bitcoin blocks take, on average, 10 minutes to confirm by the Bitcoin mining network. Provided the Bitcoin network is not under heavy load, this type of deposit usually takes 30 minutes (3 confirmations x 10 minutes) to be considered valid and displayed in your wallet balance. Of course, the deposit could be considered valid more quickly for Verified (~20 minutes) and Investor/Shareholder (~10 minutes) account types, as their confirmation requirements are reduced. The vast majority of delays in cryptocurrency deposits are due to inappropriately assessed transaction fees by the depositor. There could also be mining network conditions beyond Bitfinexs control which create delays. Withdrawals to addresses outside of Bitfinex often set their confirmation threshold differently based on their adversity to risk. Always review confirmation requirements of those in control of receiving addresses. Continue reading >>
Ethereum Faq Zebpay
Smallest unit of Eth is called wei and it is the precision of 18 decimal places. Zebpay user balances are stored in another unit called szabo which has 6 decimal places. Token of any sort will not be credited. This includes ERC20 (ICOs) and ERC721. It is advisable that you do not send ether directly to any ICO contract. Doing so, ether or any tokens of ether will not be credited to your Zebpay account. Please note: Make sure to transfer your ethers to ETH addresses only. Please DO NOT forward to ICO Contracts/Tokens. How many confirmations do Ethereum transactions need We require more than 100 block confirmations for a transaction to be successful one. Ethereum transactions can be checked at: etherscan.io/tx/ There are mainly two types of addresses in Ethereum Account address: funds are controlled by private key Contract address: funds are controlled by smart contract code For all Zebpay users we assign account addresses. Unfortunately there is no direct way to identify the type of address just by looking at it. Indirectly users can find out if the address is a contract address or account address by searching for that address in . If the address is a contract, users can find a tab called contract code on the address page of etherscan. Otherwise its an account address. What is the sending and receiving limit for Ethereum The minimum ether deposit amount per transaction is 0.0001 ether. If you send ether less than the minimum amount, ether will not be credited. The maximum ether deposit amount is 3000 ethers. Continue reading >>
Releasing Stuck Ethereum Transactions
Focusing on real-world use cases for Ethereum Ethereum is experiencing a backlog of transactions at current, resulting in a number of transactions not being processed for hours or even days. This article explains how transactions can become stuck, and what can be done to release them. There are many methods for deciding on the best gas price when sending an Ethereum transaction. Websites such as provide an overview of the gas usage and information about the current transaction pool can be found at The latter website is especially useful because it can order transactions by gas price. To do so click on the GasPrice column. The resultant list is roughly how miners will look at the transactions so if you select a gas price value to ensure that your transaction is in the first couple of pages you are likely to have very short confirmation times. But what if your transaction has not been confirmed? It is possible that it has become stuck, and needs action to be released. Before explaining how to release stuck transactions it is important to understand why transactions become stuck in the first place. Ethereum is a blockchain: multiple blocks, each containing transactions and linked one after the other in a chain as shown below: (In reality both individual blocks and the chain structure are more complex, but the diagram provides a sufficient overview for the purpose of this article). The concept of blocks being created by miners through a process called mining is well-known, but the process by which transactions are selected for a particular block is less clear. To explore this process in more detail, let us look at the creation of example block 1434 below. Ethereum contains many elements other than the blockchain, and one of these is the transaction pool. The transaction po Continue reading >>
How Long Do Cryptocurrency Deposits Take?
How long do cryptocurrency deposits take? We have a requirement for a cryptocurrency deposit to receive a number of confirmations on its blockchain before the funds can be credited to your account. After a transaction is broadcasted to a Blockchain, it is presented to be included in a block by the miners. Once a transaction has been included in a block, the transaction has had 1 confirmation. With each subsequent block, the number of confirmations increases for the transaction. To avoid the risks of double spending, funds arent credited until a number of confirmations have taken place depending on the cryptocurrency. Each block is found at a different rate depending on the blockchain. For example, a block is found on average every 10 Minutes on the Bitcoin blockchain, and Kraken only credits XBT/BTC deposits to a clients account after 6 confirmations, which takes approximately one hour. Continue reading >>
Where Is My Deposit?
We cannot credit transactions until they havethe proper number of confirmations on the block chain. Bittrex does not control the block chain nor can we make it go any faster. The transaction time is controlled solely by the block chain of the coin you are depositing. If your transaction is confirmed in the block chain and still has not been credited please let us know. For Bitcoin you can enter your transaction id here to check if it is confirmed. Again if it is an unconfirmed deposit we cannot credit it or make it go faster: To check if your deposit is confirmed on a different chain, please use a search engine and search for Coinname block explorer, which should lead you to a block explorer for that coin. Does your coin require a tag/paymentid/memo/message? Please make sure to check the deposit instructions for each coin. If you do not follow the instruction provided your coin may not be credited. If you realize that you did not include the proper tag/paymentid/memo/message please submit a ticket and provided support the full transaction hash of your deposit. If you do not provide the transaction hash we will be unable to credit your coins. The typical SLA for deposits without message is up to four weeks. Did you send your coins to the address generated for that specific coin? Bittrex has many coins. It is common for users to generate an address for one coin and then deposit a different coin to it. In some circumstances we may be able to retrieve these coins. If you sent your coin to a different coin's address you'll need to submit a ticket telling us the coin name, the address you sent the coin to, the transaction id (txid), and the amount of coins sent. This type of deposit mistake can take over 2 weeks to be credited. Continue reading >>
What Are Bitcoin Blocks And Bitcoin Confirmations ?
What are Bitcoin Blocks and Bitcoin Confirmations ? Last updated on March 18th, 2015 at 10:43 am Lets say I send you 1 Bitcoin. After a few minutes you see that this transaction has received one confirmation. What does this actually mean? The block chain is built out of blocks. Each new block is a set of new unique Bitcoin transactions that were recently made.So when I broadcasted to the network that I want to send you 1 Bitcoin the transaction went into an unconfirmed transactions pool. Miners entered the unconfirmed transactions pool, took this transaction and others like it, verified they were valid (meaning I actually have the 1 Bitcoin to spend), and grouped them into a block.The new block is set at the top of the blockchain and is considered confirmed. Now miners can move on to build the next block on top of that one. Each time a new block is built it means that the older blocks got confirmed again (since they are checked also in the process). The more confirmations you get, the harder it will be for someone to manipulate the system and remove the block containing this transaction from the wall (or blockchain) since its buried under the other blocks that were confirmed. It is recommended to wait for at least 6 confirmations in order to be 99.9% sure that your transaction wont get canceled this takes roughly 1 hour to achieve. If youre dealing with smaller amounts of money youre probably OK with waiting for just 1 confirmation. Reversing a transaction takes planning, time and effort and a lot of computing power. Most people probably wont go through all of that trouble for a small amount of money. Continue reading >>
Cryptopia - Forum
ETH hasn't arrived yet. (I sent it 3 hours ago) Sponsored Link: We presentUservice- new global decentralized transparent system built on the platform ofUREMONT.com 3 hrs 26 mins ago (Jan-03-2018 12:30:05 AM +UTC) Same issues here - etherscan shows the deposit as successful but not showing in wallet here. I have the exact same problem. Sent 4,6-7 ethers. With 729 Confirmations. 3 hours ago. maybe same block looks like im not the only one here with deposit problems. I have also sent $500 worth of ETH and its no where to be found. HELP PLEASE!!! I also have the exact same problem, I've submitted a ticket already, this is just want to raise awareness. I attempted to deposit about $200 worth of ethereum. update, about 24 hrs later my deposit has arrived and has been credited to my account. i have same problem too. My ETH price is 1200 usd dollar I've same issue it's 4 days ago, still no update, I've done ETH winthdraw, I got email for confirmation and after confirmation got sucess message but nothing got transfered and trsaction id showing not found and no transaction in ETH address. Unfortunately my ETH is in the same position. Transferred out within 5 minutes but transferring in 3+ hours now. Good luck, i've been waiting since the 23rd for an ETN deposit with no updates from support. Any update? I also sent an hour ago and still nothing in my wallet. I've read this one user who sent to his ETH wallet last December 15, and still nothing. Same here, depositedsome earlier today says transaction completed but its not in my wallet. Same here! What is happening? My ETH already sent but my cryptopia.co.nz wallet is not. Please fix its soon! I sent 2 Eth to Cryptopia, and nothing as well. This was also my very first transaction with Cryptopia. -_- Way to start off a business rela Continue reading >>
Mist Ethereum Wallet Transactions Hung At 0 Of 12 Confirmations
FINALLY! Congrats Jerry Kramer on the Hall of Fame! Filed Under cryptocurrency , Ethereum , Mist Quick summary: if you are using the Mist Ethereum Wallet (version 0.9.2, but appears to occur still in 0.9.3 which is the latest as of this post) and you send ether (ETH, the cryptocurrency of the Ethereum blockchain) without enough gas, transactions make get stuck. For those interested, sending an amount of ether (or doing pretty much anything on the Ethereum blockchain) requires fees, similar to any other processing feesexcept these have cool names like gas. There is a gas price (called GWEI) and a gas limit (commonly called gas). GWEI is just a measurement of how much ether (ETH) G is giga (like in gigawatt) and WEI is a very small fraction of one ETH (one ether). It takes 1 to the 18th power (1 quintillion) WEI to make an ETH. So a GigaWEI (GWEI) is 1 to the 9th power WEI, so it is still a small fraction of an ETH. Longer and better explanation here . There are many rationales for the transaction fees (paying miners to do crypto-calculations, cause it costs them electricity), but they do make sense you want work done, whether that is moving ETH around or working a smart contract, then there is a small fee. I wish I would have known this before I tried to send my first ETH. My first attempt got stuck, because I didnt know what gas and GWEI were, and like any cheap skate I went low and my transaction hung. Ive seen several people have this same issue For background, apparently each of the transactions are done in order, and there is a variable called nonce which determines the order. If one of the transactions get stuck for some reason (in my case I believe it was not enough gas) it appears that the others just sit there. It also appears that if there isnt a first transac Continue reading >>
Why Ethereum Takes 36 Confirmations?
This is the first time I sent eth and it doesn't appear in other wallet until 36 confirmations. Is there any minimum confirmations requirement for eth?. It is a common myth that Bitcoin is ruled by a majority of miners. This is not true. Bitcoin miners "vote" on the ordering of transactions, but that's all they do. They can't vote to change the network rules. Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here. This is the first time I sent eth and it doesn't appear in other wallet until 36 confirmations. Is there any minimum confirmations requirement for eth?. need take 36 confirmations i think sending to exchanger sample in bittrex about confirmation receive account in exchanger, every exchanger have policy This is the first time I sent eth and it doesn't appear in other wallet until 36 confirmations. Is there any minimum confirmations requirement for eth?. 12 confirmations; however, exchanges and entities handling very large amounts of Ether frequently are still encouraged to run two different Ethereum implementations and only accept transactions that have been confirmed by both for maximum security (e.g. Go & C++). More confirmation by the exchange to keep the secure transaction for his service. Continue reading >>
How Long Do Ethereum Transactions Take? Metal | Support
In ideal circumstances an Ethereum transaction takes under 20 seconds, and some sites require multiple confirmations. You can view the average blocktime here: . Sometimes due to congestion transactions may take longer, although the Ethereum Development Team is working on scaling solutions. You can view detailed metrics and a calculator for suggested Gas (fees) here: Whenever you send someone Ethereum, the transaction goes through different devicesrunning the Ethereumprotocolaround the world that make sure the transaction is valid. Once the transaction is verified it then waits inside the Mempool. Its basically waiting to be picked up by a Ethereumminer and entered into a block of transaction on the Blockchain. Until it is picked up its considered an unconfirmed transaction or a pending transaction. In some casesthere are so many transactions and blocks are finite not all transactions are picked instantly. Sometimes you need to wait for a certain amount of time until it is included in a block. Once your transaction is included in the block it receives its first confirmation and its no longer pending. After another block of transactions is added it will get another confirmation and so on... This process for transactions needs gas (fee for the Miner) and time to gothrough your buddy. Conclusion: The time, that a transaction need is based on some factors like: Gas, Gwei, amount of miner in the network and amount of transaction in the whole network.The factors vary after some time, so that it may be outdated after tomorrow. In the most cases your Wallet calculate the best fee, that your transaction goes fast to your Buddy, but you can also calculate it on that site Continue reading >>
Verifying An Ethereum Transaction
Your ethereum transaction history can be accessed by clickingEtherin the menu on the left. All ethereum transactions you have sent and received will be displayed, and additional information about individual transactions can be accessed from this section of your wallet. Start by clicking on a transaction. You can see that the transaction is either confirmed or pending on the bottom left. If you move your cursor over the box with the arrow to the left ofTransaction Confirmedyou will see the following: Clicking on this box will take you to the actual transaction on the ethereum blockchain. Our wallet will redirect you to a third party site called Etherscan.io, but you can use any ethereum block explorer to verify this information. Continue reading >>
Deposit Does Not Arrive
The exchange I am sending to Binance from shows that my transaction completed, why havent I received anything on Binance? A withdrawal marked as completed or success on an exchange does not mean that the transaction has fully processed to the receiving exchange it simply means that the transaction was successfully posted to the blockchain. Once a transaction is on the blockchain, it will still take a variable amount of time to confirm and post to the destination exchange. Different blockchains require different amounts of confirmations before a transaction is verified. It is not uncommon for a blockchain to be congested with many transactions, causing unexpected/unusual delays in processing your transaction. You may use the transaction ID (TxID) to follow the status on the blockchain. If your transaction shows unconfirmed on its blockchain, this is beyond our control. You must wait for the transaction to be processed on the blockchain. Once it is included in the blockchain, it will begin to produce confirmations. For Bitcoin and Bitcoin-based projects, your transaction should arrive on Binance by 2 confirmations. For Ethereum and most other projects (quicker to confirm), it should arrive by 30 confirmations. If you have sent to Binance from another exchange but not received a TxID, please contact customer service for that exchange. Noted: If the transaction is confirmed by Blockchain but not be credited to your binance account, please reopen original ticket and attached: Blockchain explorer sceenshot with the confirmed transaction; your account balances Screenshot missed the transaction; Well try best to solve it as soon as possible.By the way,priority would be low if tickets lack of above screenshots. 1) How do I check the transaction status on the Bitcoin blockchain? Continue reading >>
Transactions Stuck On 0 Confirmations #3386
Same here. I sent some ETH to a friend well over 17 hours ago, but it's stuck on 0 confirmations. My wallet is also stuck on having only 1 or even no peers at all. It does seem to be in sync (says stuff like 30s since last block) so you'd think it would process transactions, but nope. Etherscan just reports Sorry, We are unable to locate the Transaction Hash so the transaction wasn't even pushed it seems. I can't even cancel/remove or "outgas" the transaction because there's no nonce to override as far as I can find (and no way to do that from this wallet anyways). Amazing how all of this (low peer count, transactions stuck) are still active issues a year later; a quick Google yields many similar/identical results from the start of this year and it's not even close to being fixed. You'd think they'd focus on stabilising basic functionality like that (and its underlying infrastructure) more than "cool" extras like smart contracs. This happens in both "Ethereum Wallet" and "Mist", by the way. Latest version, not running an external geth so should be compatible just fine. Continue reading >>