How often does a block have only one transaction?


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Assessing OFAC Name Matches

5. How do I determine if I have a valid OFAC match?

Please take the following “due diligence” steps in determining a valid OFAC match.

If you are calling about a wire transfer or other “live” transaction:

Step 1. Is the “hit” or “match” against OFAC’s Specially Designated Nationals (SDN) list, one of its other sanctions lists, or targeted countries, or is it “hitting” for some other reason (i.e., “Control List” or “PEP,” “CIA,” “Non-Cooperative Countries and Territories,” “Canadian Consolidated List (OSFI),” “World Bank Debarred Parties,” “Blocked Officials File,” or “government official of a designated country”), or can you not tell what the “hit” is?

If it’s hitting against OFAC’s SDN list, one of its other sanctions lists, or targeted countries, continue to 2 below.
If it’s hitting for some other reason, you should contact the “keeper” of whichever other list the match...
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One of the largest sources of confusion in the question of blockchain security is the precise effect of the block time. If one blockchain has a block time of 10 minutes, and the other has an estimated block time of 17 seconds, then what exactly does that mean? What is the equivalent of six confirmations on the 10-minute blockchain on the 17-second blockchain? Is blockchain security simply a matter of time, is it a matter of blocks, or a combination of both? What security properties do more complex schemes have?

Note: this article will not go into depth on the centralization risks associated with fast block times; centralization risks are a major concern, and are the primary reason not to push block times all the way down to 1 second despite the benefits, and are discussed at much more length in this previous article; the purpose of this article is to explain why fast block times are desirable at all.

The answer in fact depends crucially on the security model that we...

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The money is transferred to your Toloka account after a task is completed and reviewed by the requestor (if the review is required). You can withdraw the money to your Yandex.Money, PayPal or Skrill account, or to a “PrivatBank” card (only for users from Ukraine).

Transfer commission

The operators charge commission for money transfers:

Yandex.Money — 0,1% of amount.

PayPal — 2% of amount, but not more than $7.

Skrill — 1% of amount, plus Skrill commission for currency conversion (if your account is not in dollars).

“PrivatBank” — commission is not taken, the money is converted at the bank rate.

Requirements for the Yandex.Money account

You can transfer money only to the identified account. Otherwise, Yandex.Money will cancel the transaction. The money will return to your Toloka account.

Requirements for the Paypal account

Make sure that your PayPal account is:


If you are...

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This command begins a new transaction block. If the isolation level, read/write mode, or deferrable mode is specified, the new transaction has those characteristics, as if SET TRANSACTION was executed. This is the same as the BEGIN command.


In the standard, it is not necessary to issue START TRANSACTION to start a transaction block: any SQL command implicitly begins a block. PostgreSQL's behavior can be seen as implicitly issuing a COMMIT after each command that does not follow START TRANSACTION (or BEGIN), and it is therefore often called "autocommit". Other relational database systems might offer an autocommit feature as a convenience.

The DEFERRABLE transaction_mode is a...

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What is a block explorer?

A block explorer is a service that allows you to easily view and verify information about the blocks, addresses, and transactions created by Bitcoin. It simplifies transactions by saving Bitcoin users the hassle of running the Bitcoin client to verify the exchanges. is a block explorer.

What is a block?

A block is a record of some or all of the most recent Bitcoin transactions that have not yet been recorded in any prior blocks. An analogy could be to the individual pages of a recordbook or a stock transaction ledger. New blocks are added to the end of the blockchain, and never changed or removed.

What is a transaction?

A transaction shows coins which have been sent between one of more bitcoin addresses. Often transactions include an additional "change" output.

What are address tags?


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Service providers, such as hotels and car rental agencies, often block your credit card when you start a transaction -- for example, when you check-in or pick up a car. The business estimates your final bill for a certain number of days, plus applicable taxes and fees. It often also adds additional estimated charges, such as for as room service or gasoline.

Using an electronic connection to your credit card issuer, the business reserves the estimated amount of your final bill on your credit card. Assuming you have enough available credit, the bank approves the amount and subtracts it from your available credit. For example, you may have $2,000 in available credit, and a hotel requests a block for $800. Once the bank accepts the charge, your available credit falls to $1,200.

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EF6 Onwards Only - The features, APIs, etc. discussed in this page were introduced in Entity Framework 6. If you are using an earlier version, some or all of the information does not apply.

This document will describe using transactions in EF6 including the enhancements we have added since EF5 to make working with transactions easy.

In all versions of Entity Framework, whenever you execute SaveChanges() to insert, update or delete on the database the framework will wrap that operation in a transaction. This transaction lasts only long enough to execute the operation and then completes. When you execute another such operation a new transaction is started.

Starting with EF6 Database.ExecuteSqlCommand() by default will wrap the command in a transaction if one was not already present. There are overloads of this method that allow you to override this behavior if you wish. Also in EF6 execution of stored procedures included in the model through APIs such as...

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This is a question that often causes confusion. Here's a quick explanation!

The basics for a new user

As a new user, you can get started with Bitcoin without understanding the technical details. Once you have installed a Bitcoin wallet on your computer or mobile phone, it will generate your first Bitcoin address and you can create more whenever you need one. You can disclose your addresses to your friends so that they can pay you or vice versa. In fact, this is pretty similar to how email works, except that Bitcoin addresses should only be used once.


The block chain is a shared public ledger on which the entire Bitcoin network relies. All confirmed transactions are included in the block chain. This way, Bitcoin wallets can calculate their spendable balance and new transactions can be verified to be spending bitcoins that are actually owned by the spender. The integrity and the chronological order of the block chain are enforced...

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This year at IFA in Berlin, after dinner, I went to a karaoke bar with two friends, Veena and John, where we met up with their friend Henning. I love karaoke, but am usually shy initially around people who haven’t heard me sing. After I found my nerve, I decided to sing my go-to, Paul Simon’s “50 Ways to Leave Your Lover.”

But given my company, I thought a small modification to the lyrics would earn some laughs, so I went with it—and “50 Ways to Lose Your Ledger” was born.

Over the last year, the blockchain has become one of the hottest technologies you’ve never heard of. If you search for “blockchain,” it’s unlikely you’ll find much coverage in the media before August 2014. You will certainly not find blockchain mentioned outside the context of Bitcoin. Yet within a year, all the venture capitalists are looking to invest in blockchain startups. The banks are all investing, senior finance IT executives are jumping ship to start their own blockchain startups, and even...

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