blockchain: how do block explorer sites show information that is not available in Bitcoin Core?

How can you list unused transactions and the current amount of an address that is "not in your wallet"?

Block explorer sites maintain a separate database of information that is built by continuously scanning the Bitcoin blockchain. If the block browser sites see a standard blocking script on transaction exits, they remove the addresses of those blocking scripts and the amount associated with that exit. This information is added to your database. Also, when a user spends bitcoins, they must refer txid and the output index at the transaction entry. Block explorer sites use this information to locate that exit and verify the exit blocking script, from which they derive the & # 39; input address & # 39 ;. All this information and continuous searches allow block explorer sites to associate funds with addresses and show whether bitcoins sent from a transaction have been spent or not. However, if you block a transaction in a custom script, block browser sites cannot decode this information.

How can they have information on this new generated address?

They continually scan the blockchain from which they can obtain transactions included in blocks. In addition, block browser sites run full nodes that help them collect transactions transmitted by other nodes in the mempool that have not yet been confirmed in blocks.

18.04 – Disable the amd gpu core

(5.205584 / (drm: amdgpu_init (amdgpu)) ERROR VGACON disables the amdgpu kernel mode setting.
Hi, I have this problem on my machine: I3 7100 / Asus H110M-D / RX 460 4GB / 8GB / SSD 480 and HD 1TB. I want to migrate completely to ubuntu, but I found this unexpected error, I researched before but I didn't find any publication that would definitely help me. I was able to install the system, but it has a different video unit than mine: llvmpipe (LLVM 8.0, 256 BITS). In other versions my video card appeared and it worked fine now, the video system is slow and brittle.

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matrices – Clarification on the theory behind the finding: image, core, range and operator defect $ f $

There is a linear operator $ f: โ„ ^ 3 to mathcal {P} _3 (x) $ which is defined by:

$ f (1,0,0) = 1 + x $,
$ f (0,1,0) = x + x ^ 2 $,
$ f (0,0,1) = 2 + x ^ 2 $

I need to find the core, image, range and operator defect $ f $.

The results are:
$ r (f) = $ 3
$ d (f) = $ 0
$ Cor (f) = { Theta } $
$ Im (f) = math P_3 (x) $

I have correct results but I'm not sure if my theory on how to obtain them is correct and I would like some clarification.

So, first I write the previous statement in the canon matrix and it looks like this:

$ F = begin {bmatrix}
1 && 0 && 2 \
1 && 1 && 0 \
0 && 1 && 1
end {bmatrix} $

Once I simplify the matrix by multiplying the first row with $ -1 $ and then add it to the second row, and then multiply the second row with $ -1 $ and then I add it to the third row I get:

$ F = begin {bmatrix}
1 && 0 && 2 \
0 && 1 && -2 \
0 && 0 && 3
end {bmatrix} $

I think this is enough to find everything I need.

As the matrix in this case can be written as independent, we can say that there will be no core: $ Cor (f) = { Theta } $

Since there is no core, the defect will be zero: $ d (f) = $ 0

The range can be found as $ r (f) = dim โ„ ^ 3-d (f) $ and we get that the range is: $ r (f) = $ 3

Now I am not sure how to obtain the image, but my assumption for this case would be that, due to the range and core results, it will remain the same as defined. $ Im (f) = math P_3 (x) $

Iterative algorithms to calculate the core of a matrix.

Suppose $ A $ is a $ m times n $ matrix in the form

$ A = begin {pmatrix} -a_1 – \ -a_2 – \ vdots \ -a_m- end {pmatrix} $

where $ a_i in R ^ n $ is the $ i $-th row of $ A $. It is possible to determine the null space of $ A $ by QR decomposition that can be obtained by the Gram-Schmidt process by taking a column of $ A $ in mind at each step of the procedure.

I am looking for direct / fast iterative algorithms with low time complexity that can be used to calculate the exact / approximate values โ€‹โ€‹of a set of vectors that span the null space of $ A $ taking a row of $ A $ in each step into account.

.htaccess Apache core: error 20023 20024

Default configuration of Apache 2.4, OS 7
Without .htaccess, the site works fine. The URL string contains localized characters. I create a .htaccess file strictly according to the instructions, to make a short URL. and I have some errors loading the page:

(20023)The given path was above the root path: AH00127: Cannot map GET /%D0%97%D0%B0%D0%B3%D0%BB%D0%B0%D0%B2%D0%BD%D0%B0%D1%8F_%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0 HTTP/1.1 to file
(20023)The given path was above the root path: AH00127: Cannot map GET /favicon.ico HTTP/1.1 to file, referer:


RewriteEngine On
RewriteRule ^(.*)$ %{DOCUMENT_ROOT}/index.php (L)

I couldn't find a clear answer or I don't understand something. First, it is not clear why such a simple rule that I took from a few instructions does not work. Why doesn't internal redirection to index.php work? How to fix?
And secondly, why doesn't RewriteRuke work with localized escaped pages? (error 20024) Can this be solved in any way?

I can't decipher the bitcoin core wallet, did I make a backup at the wrong time?

I am confused about why my bitcoin core wallet password would not work. I am 90% sure that I tested the correct passwords.

  • The wallet has many receiving addresses (10,000), I generated them with Linux from the command line in 2017
  • Encrypt the wallet (probably after Generating the addresses).
  • I started receiving payments, I made copies of wallet.dat after some of them, I see that the different backups of wallet.dat are the same size (probably normal).
  • Now in 2019 I downloaded Bitcoin Core 0.18.0 in Windows 10
  • put my wallet.dat in the bitcoin data folder
  • I can see the coins received
  • the wallet is shown encrypted in the lower right corner
  • If I try to send and enter the password, it says it is the wrong one

1) Can this be because my wallet.dat is from before I encrypt it? If so, it will not be shown as encrypted when the program starts, right?

2) Can mistakes like this happen because the wallet is too big (10 000 addresses, 5.7 MB) and maybe it got corrupted by generating so many addresses?

3) Any known problems of incompatibility between wallets created in Linux Ubuntu vs Windows, which could cause such problems?

4) Can the password stop working because the version of Bitcoin Core changed? I can see that the wallet was first created in October 2017, so I used the version of Bitcoin Core that was at that time.

// It is a bit difficult to do experiments with different wallet configurations due to the large address list, it takes forever to load the program / blockchain.

Drupal continues to redirect to core / install.php

I still have this problem redirecting to Drupal core/install.php As shown below:

enter the description of the image here

I already set the max_allowed_packet to 64 MB in AWS RDS. I am not sure what else I am missing. Please help

bitcoin core – What is P2PK, P2PKH, P2SH, P2WPKH – ELI5

This is how transactions are made. You require the sender to provide a valid signature (of the private key) and a public key. The transaction exit script will use the signature and the public key and, through some cryptographic functions, will verify if it matches the hash of the public key, if it does, the funds will be expendable. This method hides your public key in the form of hash for added security.

This is similar to P2PKH; The difference is that it does not hide its public key. Anyone who uses this method to send funds through the P2P network is showing people their public key in the details of the transaction.

The results of a transaction are only scripts that, if executed with specific parameters, will result in a Boolean value of true or false. If a miner runs the output script with the parameters provided and results in true, the money will be sent to the desired output. P2SH It is used for wallets with multiple signatures, which makes the outbound script logical and check for multiple signatures before accepting the transaction. P2SH It can also be used to allow anyone, or anyone, to spend the funds. If the output script of a P2SH transaction is only 1 for certain, then trying to spend the output without providing parameters will only result 1 causing the money to be spent by anyone who tries. This also applies to the scripts that return 0, causing no one to spend the exit.

This can also be used for puzzles like this.

This was a feature of segwit What does segregated witness mean? Instead of using scriptSig parameters to verify the validity of the transaction, there is a new part of the transaction called witness where validity occurs.

Also, what is the difference between BTC retained in P2SH and P2SH output without spending here?

This means that of all P2SH transactions (transactions that can be spent by anyone with a set of parameters (scriptSig) that results in the execution of scriptPubkey with true), those with unused exits have not been redeemed.

I recommend this video by Andreas Antonopoulos about the Bitcoin script.

osr – How many spells does the Magic-User have in his spell book in S&W Core?

It depends on our intelligence score (but work with your GM)

This answer is based on the fourth impression, Swords and Wizardry, Core Rules, 2011.

On page 7, the opportunity to learn a given spell is presented in a table. I will use three examples. Int of 13, Int of 15 and Int of 17, and only using the columns in that table for the Int score, the% chance of knowing a spell and the Min / Max number of spells per level you can know. (I can math jax this later)

In t______%Opportunity_______Min MAX
13 __________ 65% ____________ 5/8
15 __________ 75% ____________ 6/10
17 __________ 85% ____________ 7 / All

On the first level, see the list of first level spells on page 46. There are 8 of them.
Enchant person, detect magic, maintain portal, light, magic missile, protection against evil, read languages, read magic, shield, sleep.

  • What we used to do in old school games was to start from above
    list and work down, checking. (It was the simplest way). We did it
    have a GM that made us indicate what spells we wanted, and we would verify
    spell by spell to see if we knew it or not. Either way it works.

Check each spell: roll your percentile dice and every time you cast 65 or less, you know that spell. If the 8 rolls are 65 or less, he knows them all. Also, you know No less than 5. Then, if you miss 4 rolls, check the spells again until you get the fifth, or choose one: work with your GM on that.

If your Int was 15, you have a 75% chance of knowing each spell and you have no less than 6 in your book.

With a 17, you have no less than seven, and maybe everything, depending on your luck with the percentile dice where the goal is 85% or less.

On the contrary, if your intelligence score is 11, you can start with a maximum of six of those spells in your book.

As you level up, you will redo those controls to detect higher level spells. Or you will not. ๐Ÿ˜‰

Working with your GM is an expected part of this style of play.

You will see on page 7 where it is written that "the author does not use that rule".
This means asking your GM: is there any reason not to know all 8? If not, then the 8 are in your book.

See the introduction of Tim Kask on page 4, where he talks to GM.

What you have in hand are guidelines; This is a set of "rules" that has an internal integrity that makes it work. Is it the only way to play? Certainly not; Since the beginning of role-playing games, GMs have been encouraged to extrapolate and interpret, so that the game is theirs. If a given rule does not seem "correct", ignore it! Or, better yet, change it! Make your own game or campaign. The only thing GM should worry about is keeping an "logical reality" active in
your campaigns; players rely on that logic to find their way through the dangers and riddles of adventure.