Why was block # 289791 empty of any transactions? [duplicate]

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This is the previous block,

289790 Number Of Transactions 86 Height 289790 (Main Chain) Timestamp 2014-03-09 23:24:02 Size 43.853 KB

This is the block you are talking about

Number Of Transactions 1 Height 289791 (Main Chain) Timestamp 2014-03-09 23:30:23 Size 0.183 KB

As you can see by the size of the previous block, there was little activity in that time, only 43 KBs worth of transactions, you can also note that both blocks came less than 5 minutes apart, so perhaps the transaction pool was emptied by the previous block and there wasn't enough time for a new transaction to be broadcasted after that. Since every minute counts, miners won't wait for a new transaction to appear because they run the risk to lose the block...

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It's possible that this could happen just because there aren't any transactions to be mined. Early on in the bitcoin block chain, this was often the case. This could also happen if two blocks are solved on top of each other in a very short amount of time, with not much time for new transactions to be broadcasted in between. Today, however, more often than not this is due to a miner trying to get his/her block out to the rest of the peers on the network as soon as possible.

A miner would want to do this because bigger blocks take longer to propagate to the rest of the network. Nodes have to download and verify the validity of a block before they can relay them to their peers, because if they don't verify before sending and they send an invalid block, then their peers may ban them and the node will have no one to connect with on the network.

Think of it this way. If your block takes 50 seconds to get out to 90% of the peers on the network, and someone else mines a block...

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Scenario is very rare, but quite simple: you define a generic class, then create a nested class which inherits from outer class and define a associative field (of self type) within nested. Code snippet is simpler, than description:

class Outer { class Inner : Outer { Inner field; } }

after decompilation of IL, C# code look like this:

internal class Outer { private class Inner : Outer.Inner> { private Outer.Inner>.Inner field; } }

This seems to be fair enough, but when you change the type declaration of the field, things become trickier. So when I change the field declaration to

Inner.Inner field;

After decompilation this field will looks like this:

private Outer.Inner>.Inner>.Inner field;

I understand, that class 'nestedness' and inheritance don't quite get along with each other, but why do we observe such behavior? Is the Inner.Inner type declaration has changed the type at all? Are Inner.Inner and Inner types differ in some way in...

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No, you cannot prevent a DDoS attack that way.

By the time the packets reach your server they have already consumed capacity on the saturated link. Dropping a packet with iptables is not going to give you back the link-time which has already been used.

In order for a measure against a DDoS attack to be effective it has to block packets before they enter the saturated link.

The different IP addresses could (depending on provider) help you in a different way. The router sending packets down the saturated link might be configured to share capacity evenly among destination IP addresses. If that is the case a DDoS attack against one IP address will only have minor impact on the other.

But if an attacker knows both IP addresses, the attacker can easily share the attack traffic evenly across those two IP...

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You are not booting in BIOS/CSM/legacy mode. You have no BIOS-mode boot loader installed in the disk's MBR, but you do have EFI-mode boot loaders in the EFI System Partition (ESP; /dev/sda3 on your computer). The fact that your firmware is set to enable BIOS/CSM/legacy mode is irrelevant; on most computers, that option just opens the door for such boots, but doesn't force the computer to boot in that way.

Do not delete the ESP. Your boot loaders reside there, so deleting that partition will render the computer unbootable!

Your description is unclear about what's causing the sluggish boot. Elaboration on this point is required. For instance, does it take a long time for GRUB to appear, or does the system pause for a long time after GRUB appears? It might be helpful to use GRUB to edit the boot options so as to remove the quiet splash kernel options. This should result in a more verbose boot, which may provide a clue about what's causing the slowdown -- you might see...

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By far the most common issue I’ve come across with ecommerce sites; duplicate transactions can inflate revenue and ecommerce metrics, altering your attribution reports and making you question your data integrity.

When talking about where to put the ecommerce tracking code, Google suggests the following for Universal Analytics:

… If successful, the server redirects the user to a “Thank You” or receipt page with transaction details and a receipt of the purchase. You can use the analytics.js library to send the ecommerce data from the “Thank You” page to Google Analytics.”

The missing step here is to ensure that either A) the user cannot access the page more than once or B) you have logic in place to make sure the transaction is only sent once. The biggest issues I’ve seen are when this receipt page is automatically emailed to the customer, with the ability for them to return as frequently as they please, each time sending a duplicate transaction.
...

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Jan 19, 2010

I wonder if there is some tiny technique to trace a duplicity on a block label without committing the records ( Maybe on Validate or new record instance)

I have one procedure to check duplicate but what I remember that there is something very smart provided from oracle to do that.

SQL & PL/SQL :: How To Check And Delete Duplicate Data From Table Backup & Recovery :: What Is Data Block Check Sum Algorithm Forms :: How To Check Particular Item Updated In A Block Forms :: How To Check For Unique Value In Text Item In Multi-record Block Forms :: Multiple Sort Options / Check Boxes On Header Block Forms :: Multi Data Block And Checkbox Field Based On Control Block PL/SQL :: Check For Any Duplicate Values In COUNT() Column Forms :: 6i - One Data Block Based On Table / Fetching Data Forms :: Put One Check Box To Check All The Check Boxes? Forms :: Populate Data Block Forms :: 11g - Create Data Block? Forms :: Data Block Using Query? Forms ::...
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Visit the original article

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Blocks on the Bitcoin blockchain have a maximum size of 1 MB. Proof of work difficulty is calibrated so 1 block is created every 10 minutes. It is generally accepted a miner would want to maximise the number of transactions it includes in a block as it collects the transaction fees. Logically, with the growing popularity of Bitcoin, the average block size is getting closer to its limit.

In this environment, it is surprising to see a number of empty blocks being mined. An empty block is not entirely empty, it has 1 transaction : the coinbase transaction which allocates the mining reward to the miner (12.5 bitcoins at the time of writing). It is important to know, that empty blocks are not easier, cheaper or quicker to mine than full blocks. The ratio of empty blocks varies considerably from one mining pool to the other. For instance, Bitfury, BitClub Network and Kano CKPool do not mine empty blocks.

Why are there empty...

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Blocks on the Bitcoin blockchain have a maximum size of 1 MB. Proof of work difficulty is calibrated so 1 block is created every 10 minutes. It is generally accepted a miner would want to maximise the number of transactions it includes in a block as it collects the transaction fees. Logically, with the growing popularity of Bitcoin, the average block size is getting closer to its limit.

In this environment, it is surprising to see a number of empty blocks being mined. An empty block is not entirely empty, it has 1 transaction : the coinbase transaction which allocates the mining reward to the miner (12.5 bitcoins at the time of writing). It is important to know, that empty blocks are not easier, cheaper or quicker to mine than full blocks. The ratio of empty blocks varies considerably from one mining pool to the other. For instance, Bitfury, BitClub Network and Kano CKPool do not mine empty blocks.

Why are there empty blocks?

When a mining pool...

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