[WTS] Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration

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[WTS] Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick setup

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utxo – How does the miner ensure that a transaction fetched by mempool is actually valid?

Does this mean that if mempool contains a transaction that says "A" gave "B" 0.1 BTC, then the miner should actually make sure that "A" has that much unused BTC before putting that transaction into one can choose to promote block?

This is a misunderstanding of how Bitcoin transactions work, assuming that coins are "issued out of a purse", which is not the case.

All transactions issue one or more previous transaction issues (TXOs). The expenses are always spent completely and become the input for the new transaction. Each transaction issue is locked with a public key hash, so only the person who knows the private key associated with the public key can unlock the issue to output it. This is done by digitally signing the withdrawal transaction with the private key.

A wallet as it belongs ON, is simply a collection of private / public key pairs – a pair for each TXO to which it belongs ON, (Although the same key can be used for multiple TXOs, this is not recommended). The balance of the wallet ON is the sum of the balances for all unissued Transaction Expenses (UTXO) for which the wallet has the private key to unlock and issue.

When then ON wants to pay 0.1 TBC BHe will select one or more of the UTXOs he can spend so that the collective balance is at least 0.1 BTC. These become the entrance of his new transaction. The transaction contains an output with a public key that belongs to B (its Bitcoin address) equal to 0.1 TBC. The transaction may also include a change output that outputs the difference between the sum of TXOs issued by ON and the payment of 0.1 TBTC B, minus transaction fees – this change issue will be issued to a new address whose owner ON, These two outputs become new UTXOs and the previous ones are output.

Miners have no knowledge about the wallet balances of ON or B – You can only see the amount of each UTXO and determine if they can be issued, depending on whether the signature in the transaction is the correct one for the public key that locks the UTXO. You determine that the sum of the Issue Amounts is less than the sum of the Entry Amounts, and the difference between the two becomes the Transaction Fee that the Miner charges. If all checks are successful, the transaction is valid.

Miners therefore only need to keep a reference to all UTXOs in the blockchain to determine that they have not yet been issued. All past historical transactions that have been issued are archived and do not need to be called.

In Bitcoin Core all block data is archived. In addition, the software manages an index called the UTXO set. It indicates where each UTXO is in the archive. For reasons of performance, the UTXO set is stored in a database that is assigned to the memory.

The UTXOs are identified by the transaction ID. This is the double SHA256 of all the transaction data found anywhere in a block and the index of the issue in that transaction. (Collectively referred to as transaction origin).

When new transactions or blockages arrive from the network, the miner must validate them all. The inputs of each transaction contain a transaction starting point that must be looked up in the UTXO set. All signatures must be checked to match the public keys that can issue the output (this is part of a script that must always be successfully evaluated)). If any checks fail, the transaction or lock is invalid. If all are successful, the UTXOs issued by the transactions are removed from the UTXO index and the new issues are added.

[WTS] Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration

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Objective – do I see enough improvements from EF-S to "L" lenses to ensure the cost?

Will I really see better photos to guarantee the cost?

Honestly, probably not. Recording better photos has much more to do with the knowledge, experience and creative eye of the photographer than with the slight differences between comparably good lenses or camera bodies.

If you can not explain what your current two lenses are, that limit the ability to create the photos, you might want the slightly better optical quality and slightly faster maximum apertures probably no real improvements to your photos. In fact, if you know the limitations and know how to handle them, if you use larger apertures, you might get pictures that are not as good as you could do with your two current lenses.

The key benefits of the three "L" lenses you are considering are durability and resistance to adverse environmental conditions. These features are crucial for working professionals who put their equipment through the Wringer every day. Yes, they are visually a little better than your current lenses. Their "sweet spots" are larger in terms of the focal lengths and openings, where they occur at a slightly higher level. However, in terms of optical performance, they are much closer to the current lenses than to the true premium lenses in each category, e.g. B. EF 11-24 mm 1: 4L, EF 24 – 70 mm 1: 2,8L II or EF 70 -200 mm 1: 2,8L IS II. Even these lenses only make a noticeable difference when used with or used near open openings. At f / 5.6 or f / 8, there is little difference in the optical world.

If you really have more options for taking pictures on vacation that you can not achieve with your current lenses, consider an ultra wide-angle lens such as the EF-S 10-22mm f / 3.5-4.5 , That would only be good if you are interested in taking in the current 15-85mm wider views.

All these years, I wish I had quality L-glass … Because, as someone said, there's a lot in the eye. I feel like I have that. I shoot only in manual mode and search for the color bangs … Sharp scenes that I suspect come with "good glass".

There is nothing "magic" about L-glass. For example, the EF-S 17-55 mm 1: 2.8 IS in a crop sensor is optically about 24 mm better than the EF 16-35 mm 1: 2.8L II. It is also almost the optical equivalent to the original EF 24-70mm 1: 2,8L, with the "L" on a FF body and the 17-55mm on one of the newer grain cultures. The newer 24-70mm is optically much better, from 24mm to 70mm at each aperture, even with the wider aperture, as the newer high-resolution cameras revealed the shortcomings of the older 24-70mm.

For f / 5.6-f / 8-f / 11 apertures, which are used for most landscape shots, virtually all current Canon, Nikon, Sony, Pentax, etc. lenses are very good throughout the image, assuming They are in the right orientation and have developed a flat field. There are some very expensive lenses that have been developed for specific uses and leave the field curvature uncorrected. That's one of the things that make the EF 85mm 1: 1,2L a "portrait lens" with such a unique look. Such a lens, while costing thousands of dollars, is not a suitable lens for most landscape work.

I suspect this Farbrausch sharp scenes It's more about catching the right quality light at the right angle with a camera mounted on a stone tripod. I know many landscape photographers who drive to the same spot every day until they finally get the light they want. One day it may be too cloudy. The next day there may be too much or too little moisture or dust in the air. It could rain the next day. Just because you're standing in the same spot from which an iconic photo was taken does not mean that you always have the same light, even if you have the same angle of the sun. Nothing compares to the light coming from a low sun in the late afternoon, after a storm has just passed over us and the sky in the west becomes clearer. The light is so saturated and golden that you can do it practically feeling Its warmth immerses everything in Technicolor and makes the world look like a Kodachrome slide. The same place at the same time of day the day before or the day after can look flat and lifeless under a comforting sky.

In the digital age, we can "fix" the light in the inbox much easier and with a larger width than in the color dark room, but we still can not move the sun from one point in the sky to another.

Here's my suggestion: For the next few weeks, you should travel at the same time every day at the same time with camera, tripod and cable release to the most scenic spot in your area. If the sun is most favorable for your chosen location, probably go in the early morning or late afternoon. Make the most of what you can do with the tripod and cable release. If the shutter speed is less than 1/200 seconds, also use the mirror lock. On even days, use your 15-85 between 55-85 mm. On odd days use the 55-250 mm between 55 and 85 mm. If you have a 50mm 1: 1.8 lens or other main lens, also throw it into the mix. At the end of the two weeks, edit the best shot of each day and compare the 14 photos. Let us know what you think about the 14 photos and how they compare with the others.

There is an old saying that has existed for a long time: Gear does not matter
That's really only half the story.
The full truth is: Gear does not matter – until it works.

When the limits of your equipment really start to grow in importance and where you work as a photographer, you know it.

P.S.- The reason why the 16-35mm f / 4 gets better reviews is if you do not really, really, really need the f / 2.8 lens for moving objects in low light is the f / 4 lens good or even better for all f / 4 f-stops. And it's cheaper to boot.

[WTS] Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration

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Real-time – What is a good technique for processing an event stream to ensure sequential or transactional consistency

I am trying to improve an event-driven processing system that has some problems because the events are not guaranteed to arrive in the correct chronological order. This is due to stacking and caching in the upstream area, which is currently out of my control.

The sequence errors are not a complete disaster for my processor, mainly because it is FSM-oriented and thus handles "weird" transitions and mostly ignores them. The events are also timestamped and are expected to be delayed, so we are used to reconstructing the story. However, there are some cases that cause unwanted behavior or unnecessary duplication.

I'm looking for a technique that can either queuce, group events and sort them before processing, or identify "transactions" in the stream.

An example of a correct event stream would look like this: All events are time-stamped:

10:01 Start the user session (user A)
10:02 Device event 1
10:03 device event 2
10:10 End of user session (user A)
10:15 start the user session (user A)
10:16 End of user session (user A)
10:32 Start the user session (user B)
10:34 device event 3
10:35 device event 4
10:50 End of user session (user B)

My downstream processor monitors who uses a device, but also has to relate the other device events to the users. This is done by keeping the status of the sessions while receiving the other events.

Each event is handled in practice by various Message Queue workers with a centralized database. So there are potential race dangers, but that's not the focus of this question.

The problems occur when the same stream of data arrives so … that they indicate the gaps between the three "stacks" when they are received much later.

10:10 End of user session (user A)
10:01 Start the user session (user A)
10:02 Device event 1
10:03 device event 2
...
10:16 End of user session (user A)
10:15 start the user session (user A)
10:34 device event 3
10:35 device event 4
...
10:50 End of user session (user B)
10:32 Start the user session (user B)

I'm especially interested in "the last device event in a session". So here I need the 10: 10 session and + the 10: 03 device event 2 to complete the picture. I know that every device event scheduled between 10:01 and 10:10 is "owned" by user A. So when I get device event 2, I can correlate it – OK. If I get the start event at 10:01, I can ignore it because I've already seen the corresponding end (just annoying). When I get device event 1, I can not say if it's the last one or not. So I process it. Then I get device event 2 immediately after and repeat the same work, update the status to assume that this is the last one. I can not predict if there will be more device events, so the FSM just has to stick with this assumption – which is correct in this case.

The next batch is more difficult to deal with. I get a second "empty" session from User A – no problem in itself. Then I get some out-of-sequence device events that are for user B's session that I have not yet received. This is not a critical problem. I can update the associated device model with this information, but I can not finish processing yet.

Finally, the User B events arrive, and I can correlate back to the device events, ignoring "older" events whenever possible.

Hopefully you can see that this makes the processing much more difficult and probably leads to some missing cases.

What can I do to massage this event stream for better processing?

I thought about it:

  • Event Sourcing (but it requires correct order)
  • Caching the queue for X minutes (but I'm still not sure how long)
  • Implementation of the Nagle algorithm for the detection of punk / pauses / gaps
  • Combine all workers with an FSM (Session-Boxing Mirroring), which outputs the events as soon as they have completed the interdependence sequence checks
  • Do not repair the queue and implement a random order processor

Since I can make some assumptions about the likely content of the stream, I can consider a "transaction detector" or make no assumptions, just a more general "stream re-order" approach.

I know sequential numbers could easily fix this, but like I said, I can not change the upstream publisher right now.

I am not looking for a complete solution, but only point out algorithms or techniques used for this problem class so that I can continue my research.

[WTS] Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration

This is a discussion about Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration within the Webmaster Marketplace Forums, part of the business category; VEEBLE – www.veeble.com

Veeble provides web hosting services such as virtual private servers, dedicated servers, remote desktop solutions, web hosting, cloud …

,

[WTS] Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration

This is a discussion about Bulk IP Server ⚡ 256 IPv4 addresses meter Unmetered 1 Gbps ⚡ Quick Configuration within the Webmaster Marketplace Forums, part of the business category; VEEBLE – www.veeble.com

Veeble provides web hosting services such as virtual private servers, dedicated servers, remote desktop solutions, web hosting, cloud …

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Air travel – How can airport security ensure that you can transport a battery bank of over 100 Wh?

In about 3 months I will fly via Stockholm Arlanda with SAS from Estonia (Tallinn) to New York (Newark). I have an Aukey battery with 30000 mAh (~ 111 Wh), which I would like to take on board. I researched and discovered that batteries with more than 100 Wh must be approved by the airline. On my last flight from Tallinn with British Airways, I was not allowed to bring the battery bank with me and had to leave it for safekeeping.

I contacted the SAS customer service and they gave me permission (verbally, by phone) to take the battery bank in my luggage. They also say that it is somewhere in the booking notes that the staff would see at check-in. But how should the airport security staff in Tallinn and Newark know that I am allowed to carry them? Can you look up and check my booking there, or should I obtain a written authorization from SAS to show my safety?