Can I see all transactions not included in a block yet?


The latest versions of our wallet now use a dynamic fee structure (which you can read about here) to determine appropriate fees for your transactions, so some of the information in this post no longer applies.

If you have a pending transaction that is taking an abnormally long time to confirm, it may be due to network congestion. To find out more about how network congestion can affect your transaction, check out this article in our Support Center.

This is a Blockchain Quick Bit, where we cover the basics of a topic, or product, to help you understand it better. This Quick Bit is intended to help you learn about bitcoin transaction fees. Bitcoin transaction fees are one of the many benefits for consumers and merchants to utilize bitcoin, and is an attractive aspect of the digital currency. Currently bitcoin transaction fees can average to around .04 cents USD (or 0.0001 BTC) per transaction.

Bitcoin transactions are in place as an incentive to miners when...

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If you’re reading this post I assume that like many others, you sent a bitcoin transaction and was kind of confused as to why it’s still listed as “unconfirmed” or “pending” after a few hours or so.

I mean Bitcoin transactions are supposed to be instant right?

In this post I want to try and explain in a very basic way how a Bitcoin transaction works and why the fee that you attach to each transaction has a crucial role in how long it will take the transaction to go through the network.

Here’s what happens when you send Bitcoins to someone

Whenever you send someone Bitcoins, the transaction goes through different computers running the Bitcoin protocol around the world that make sure the transaction is valid. Once the transaction is verified it then “waits” inside the Mempool (i.e. in some sort of a “limbo” state).

It’s basically waiting to be picked up by a Bitcoin miner and entered into a block of transaction on the Blockchain. Until it is picked...

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When can I see the USD value of BCC? And more noob questions. | Localbitcoins


Where can I see the USD value of BCC? And when is it safe for me to move my Bitcoins out of a wallet that I know the private key to back into LBC so I can start selling again? By "safe" I mean that I am guaranteed to be able to access the BCC in the wallet I stored all my bitcoin in as opposed to pulling out too quickly and losing the BCC. Thank you all again.


you need to wait for a BCC block to be mined Look for a block greater than 1MB, that is the fork. Has not happened yet.


Trading on viabtc, btcpop, and yobit right now it seems. Kraken not yet, they are likely waiting for a block, which is the right thing to do.


I think I read somewhere. The first block ( Bcash ) could take up to an hour. So probably around 13:20ish UTC or 9:20am...

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Frequently in popular descriptions of Bitcoin and in the user interfaces of wallet software, a distinction is made between “confirmed” and “unconfirmed” transactions. What is the difference?

At a high level, a transaction is only confirmed when it is permanently included in the Bitcoin blockchain. The blockchain is a ledger of all transactions in the history of Bitcoin. It is append-only, meaning new data can be added to the end of the ledger, but data can never be removed once included. This ledger is necessary to prevent double-spending, which is a key technical challenge in designing any cryptocurrency.

How Bitcoins are Transferred

Recall that if Alice “owns” some quantity of bitcoins, this really means she knows one or more cryptographic keys which have been designated as the controller of those coins in a transaction on the ledger which transferred the coins to Alice. In order to transfer the coins to another entity, Alice will use these keys to produce a...

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Typical timeline during testing:

1 second

: Remote wallet can see the transaction has been initiated

3 minutes 46 seconds

: Remote wallet displays first confirmation of transaction appearing in the blockchain

26 minutes

: Remote wallet receives 10 confirmations of the transaction and considers the funds fully confirmed and unlocked for spending

When you send a Monero payment, it will be announced to the Monero network instantly. In our tests, in about 1 second, a Monero wallet on the other side of the planet will be able to see that the transaction has been announced. (Because the transaction is not yet confirmed, this requires use of the show_transfers pool command - see our tutorial)

However, it is not enough to rely on that announcement, because the sender could make multiple such announcements in an attempt to 'double spend' their funds. This is why the annoucement of the transaction needs to be 'mined' into a block by the network...

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An autonomous transaction is an independent transaction that can be called from another transaction, which is the main transaction. You can suspend the calling transaction, perform SQL operations and commit or undo them in the autonomous transaction, and then resume the calling transaction.

Autonomous transactions are useful for actions that must be performed independently, regardless of whether the calling transaction commits or rolls back. For example, in a stock purchase transaction, you want to commit customer data regardless of whether the overall stock purchase goes through. Additionally, you want to log error messages to a debug table even if the overall transaction rolls back.

Autonomous transactions have the following characteristics:

The autonomous transaction does not see uncommitted changes made by the main transaction and does not share locks or resources with the main transaction.

Changes in an autonomous transaction are visible to other...

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A new study by the UCL Centre for Blockchain Technologies reveals that “43% of the transactions are still not included in the Blockchain after 1h from the first time they were seen in the network and 20% of the transactions are still not included in the Blockchain after 30 days, revealing therefore great inefficiency in the Bitcoin system.”

The bitcoin network was studied over a period of three months where some 12,000 unique nodes were found to be connected with confirmation times less inefficient for large value transactions. The study says:

“In this case, we note that the process is still rather slow but most of the value is included in the Blockchain within 3h (93%) and after 30 days only 0:1% of value is left to be included.”

The study makes a number of interesting claims. They say, for example, that nearly 200,000 blocks were received during a one week period when only...

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If you have sent a bitcoin payment in the last couple of weeks, you may have noticed that your transactions are taking much longer than expected to confirm.

We have received your emails.

Since, like the Bitcoin network, we are currently working through a backlog, we want to thank you for your patience. With the high volume of questions we're getting about delayed payments, we decided it would be best to write a short explanation about what's happening with many bitcoin transactions right now.

Transactions on the Bitcoin network itself aren't controlled or confirmed by BitPay, but by the bitcoin miners which group transactions into "blocks" and add those blocks to the Bitcoin "blockchain" – the shared historical record of all transactions. When a transaction has been added to a block six blocks ago, it's considered a done deal.

Currently, bitcoin network traffic is unusually high due to increasing demand for transactions per block. Block sizes are...

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How can I check on the status of my transaction?

Can I cancel, override, overwrite, replace, or do anything once a transaction has been sent?

99.9999999999999999% of the time the answer is NO.

Once a transaction has been mined and is included in a block on the blockchain, it cannot be canceled or replaced.

During times of normal volume, transactions are mined within seconds and do not spend any length of time in the transaction pool. There is simply not enough time to cancel or replace or override a transaction once it has been sent.


During times of extremely high volume (like we've seen during the Bancor and Status Token Contribution periods), transactions could be pending for hours, if not days, before being mined.

During these times it is theoretically possible to replace an existing transaction with a new transaction with a higher gas price.

The second transaction, theoretically, will be mined before the...

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This page is for frequently asked questions that do not yet appear in the main FAQ.

It's also a place for questions in progress, so feel free to ask new questions, or answer and/or refine existing answers.

Ask your question here:

How much electrical energy per transaction is projected?

Answered Questions

How does it work (for non-geeks)

Why can't somebody just create a version of the software that gives you extra bitcoins?

When you spend some bitcoins, the software on your machine has to prove to the software running on everybody else's machine that those bitcoins are valid.

How does it do that? Well, it is a little bit complicated; you've got to understand how bitcoins are created, and how they are traded.

First, how they're created: 25 bitcoins are created approximately every 10 minutes. Everybody who is trying to create bitcoins is in a race to try to find those 25 bitcoins; they are really hard to find, but,...

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If you are unsure whether your bitcoin address has received funds and/or do not have your bitcoin wallet at hand you can still check by using a Blockchain Explorer, as all bitcoin addresses are publicly visible on the bitcoin blockchain you can look them up if you are aware of the address or the transaction id.

If you need support, giving us the transaction id or the bitcoin address will greatly improve the service we can give you, so the more information you give us, the better our answer will be :)

Please see the example below:

We find the transaction within the Transactions Tab, it already shows us here that our transaction has 0 Confirmations Select the Transaction in question, at the top select Show Details The Transaction Details will be shown in the following screen, listing all inputs as well as outputs used by this transaction. Clicking on any of the details will show you the address (or transaction when selecting the Hash/Transaction ID) in the...
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BlockCypher runs the Main and Test Bitcoin, Litecoin and Dogecoin block chains. The BlockCypher API is a simple, mostly RESTful JSON API, accessed over HTTP or HTTPS from the domain. All URLs are versioned. We provide push-style APIs using WebSockets and allow you to register a URL to POST to via WebHooks.

Alternatively, libraries native to multiple programming languages can be used.

Several code samples are provided throughout this documentation. If you would like to check them first, they're listed here:

Low volume access to our APIs is fully open but obtaining an API token is recommended to avoid rate limiting. Please contact us if you have any questions.

Language Specific Libraries

Multiple libraries exist for most mainstream programming languages, either provided by BlockCypher or by the community:

RESTful Resources

Most resources exist under a given block chain. The URLs to Bitcoin, Dogecoin, Litecoin, Uro...

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Special thanks to Gavin Wood for prompting my interest into abstraction improvements, and Martin Becze, Vlad Zamfir and Dominic Williams for ongoing discussions.

For a long time we have been public about our plans to continue improving the Ethereum protocol over time and our long development roadmap, learning from our mistakes that we either did not have the opportunity to fix in time for 1.0 or only realized after the fact. However, the Ethereum protocol development cycle has started up once again, with a Homestead release coming very soon, and us quietly starting to develop proof-of-concepts for the largest milestone that we had placed for ourselves in our development roadmap: Serenity.

Serenity is intended to have two major feature sets: abstraction, a concept that I initially expanded on in this blog post here, and Casper, our security-deposit-based proof of stake algorithm. Additionally, we are exploring the idea of adding at least the scaffolding that will allow...

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The blockchain is the new hot technology. If you haven’t heard about it, you probably know Bitcoin. Well, the blockchain is the underlying technology that powers Bitcoin. Experts say the blockchain will cause a revolution similar to what Internet provoked. But what is it really, and how can it be used to build apps today? This post is the first in a series of three, explaining the blockchain phenomenon to web developers. We’ll discuss the theory, show actual code, and share our learnings, based on a real world project.

To begin, let’s try to understand what blockchains really are.

What Is A Blockchain, Take One

Although the blockchain was created to support Bitcoin, the blockchain concept can be defined regardless of the Bitcoin ecosystem. The literature usually defines a blockchain as follows:

A blockchain is a ledger of facts, replicated across several computers assembled in a peer-to-peer network. Facts can be anything from monetary transactions to...

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Bitcoin is the currency of the Internet: a distributed, worldwide, decentralized digital money. Unlike traditional currencies such as dollars, bitcoins are issued and managed without any central authority whatsoever: there is no government, company, or bank in charge of Bitcoin. As such, it is more resistant to wild inflation and corrupt banks. With Bitcoin, you can be your own bank.

If you are new to Bitcoin, check out We Use Coins and You can also explore the Bitcoin Wiki:

How to buy bitcoins worldwide
Buying Reddit Gold with bitcoin

Will I earn money by mining bitcoin?

Security guide for beginners - (WIP)

Community guidelines

Do not use URL shortening services: always submit the real link. Begging/asking for bitcoins is absolutely not allowed, no matter how badly you need the bitcoins. Only requests for donations to large, recognized charities are allowed, and only if there is good reason to believe that the person...
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The purpose of this document is to instruct SAP customers on how to analyse hanging situations in their HANA system.


So what constitutes a hanging situation in HANA? When we talk about a hanging situation we generally refer to a whole system wide hang, as opposed to highlighting one specific activity, ie: queries or operations. This means we are going to look at the systems conditions (performance) which leads the DB to run slowly, or not at all in some cases;


Database has stopped responding but has not crashed. Database hangs during startup and does not start up. Application is hanging but new connections to the database are still possible (Possibly not a HANA DB issue which must be analysed from an application perspective before looked at from a HANA DB perspective)

Like all other software systems, SAP HANA relies on hardware to run its processes. Even when looking at the most basic single sever, single host, we...

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access driver

In the external table infrastructure, the API that interprets the external data for the database. The access driver runs inside the database, which uses the driver to read the data in the external table.

access path

The means by which data is retrieved from a database. For example, a query using an index and a query using a full table scan use different access paths.

active transaction

A transaction that has started but not yet committed or rolled back.


Automatic Database Diagnostic Monitor. An Oracle Database infrastructure that enables a database to diagnose its own performance and determine how identified problems could be resolved.


Automatic Diagnostic Repository. A a file-based hierarchical data store for managing diagnostic information, including network tracing and logging.

alert log

A file that provides a chronological log of database messages and errors. The alert log is...

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