What happens if the last added block in a blockchain is corrupted?

Each full node unilaterally checks each block for validity. If a block does not comply with the consensus rules, a full node does not accept it as valid, does not consider included transactions as confirmed, and does not forward it to other nodes.

A similar incident occurred, for example, in July, when Antminer inadvertently demanded a higher block reward than allowed in block 584,802.

Here you can read more about:
https://twitter.com/bitmexresearch/status/1148989508588883970

Why does not a custom block with a form render in a bootstrap design?

In a bootstrap subtopic, my blocks are not rendered with embedded forms. I've verified that the issues persist, even though I'm only activating the base topic. Considerations of why blocks with embedded forms are not rendered in a bootstrap subtopic. Instead, I started to make my own theme from scratch after trying for a long time to debug it.

Dynamic Gutenberg Block with React instead of PHP

I'm building a WordPress theme based on the WordPress Rest API. But I want to create a custom Gutenberg block that shows the most popular posts. Is there a way to create the dynamic part (Save Part) with "Reactivate" instead of PHP? If not, how can I set up the "Read More" link as a "React Router Navlink" instead of an HTML tag? If the user clicks on it, the browser will not be updated and the new route will be transmitted.
Many thanks.

Blockchain – How do Block Explorer sites display information that is not available on Bitcoin Core?

How can you list unissued 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 created by continuously searching the Bitcoin blockchain. If Block Explorer sites see a default lock script in the outputs of the transactions, the addresses and the amount associated with that output are removed from these lock scripts. This information is added to your database. Even if a user issues bitcoins, he must refer to that txid and the output index in the input of the transaction. The Block Explorer sites use this information to locate this output and check the output lock script, from which it prints the & # 39; input address & # 39; derived. All this information and the continuous search allow Block Explorer sites to link money to addresses and indicate whether or not the bitcoins sent by a transaction have been issued. However, if you lock a transaction in a custom script, the Block Explorer sites will not be able to decode that information.

How can you possibly have information from this newly generated address?

They continuously scan the blockchain from which they can retrieve transactions in blocks. Block explorer sites also execute complete nodes so that they can capture transactions that have been forwarded by other nodes in the mempool and that have not yet been acknowledged in blocks.

Block Editor – Filter or remove standard panels in the Gutenberg PrePublish panel

I would like to edit the text or remove and re-create the publishing window of Gutenberg's PrePublish window in the sidebar of the editor.

I know that I can use it wp.data.dispatch( 'core/edit-post' ).removeEditorPanel( 'example-panel' ); but it does not seem to work for panels editor-post-publish-panel, Any ideas?
Enter image description here

The background is that I used the slotfill API to insert a time zone selection box so that authors can use their local time to select their publication date. This works great except when you click Schedule and retrieve the publish time in GMT without context.

How to unlock my IP from MS block

Hello,

As I've mentioned in other parts of the webhosting talk forums, some of my clients do not maintain their websites, which sometimes causes spam emails to be sent to nonexistent accounts worldwide.

The biggest and unresolved issue for me is the following blocking of my IP address when sending messages to Microsoft managed e-mail accounts (not just outlook.com, hotmail.com, and all domains that use MS e-mails). Use services) spam.

This is how emails from my suspended IP look to MS email accounts:

———— Begin ———-

some.user@outlook.com: host
outlook-com.olc.protection.outlook.com (104.47.9.33) said: 550 5.7.1
Sorry, no messages were sent from (xxx.xxx.xxx.xxx). Please contact
Your ISP, as part of its network is in our block
List (P3150). You can also contact your provider
mail.live.com/mail/troubleshooter.aspx#errors.
(VE1EUR03FT022.eop-EUR03.prod.protection.outlook.com) (in response to MAIL
FROM command)

———— The End ———-

The above link (mail.live.com/mail/troubleshooter.aspx#errors.) Describes only the reason, also refers to Spamhouse, but my blocked IP is not listed in Spamhouse, so I can not unlock.

MY QUESTION IS:

How can I remove this type of IP block (if the problem with spam is eliminated)?

Mining theory – Is it possible to generate (dismantle) a block with a specific transaction via bitcoin-cli on?

In the function addPackageTxs https://github.com/bitcoin/bitcoin/blob/ef70f9b52b851c7997a9f1a0834714e3eebc1fd8/src/miner.cpp#L306

while (mi != mempool.mapTx.get().end() || !mapModifiedTx.empty())
{
    // First try to find a new transaction in mapTx to evaluate.
    if (mi != mempool.mapTx.get().end() &&
            SkipMapTxEntry(mempool.mapTx.project<0>(mi), mapModifiedTx, failedTx)) {
        ++mi;
        continue;
    }

You can change the while loop and select which transition index you want to include in the block.

For example, you can skip transactions that are in mempool within 2 seconds of the current time

while (mi != mempool.mapTx.get().end() || !mapModifiedTx.empty())
{
    CTxMemPool::txiter iter = mempool.mapTx.project<0>(mi);
    auto time_now = GetTime();

    if (time_now - iter->GetTime() < 2){
       continue;
    }

}

How do I block user agents with htacces?

I have seen many answers, but everyone mentions the conversion of the user agent to the regex format. I do not know how to do it. Please help me create HTAccess rules to block the following user agents. Anyone can help me with this problem. Here are the user programs that I want to block.

Mozilla / 5.0 (Windows NT 6.2; WOW64) AppleWebKit / 537.36 (KHTML, like
Gecko) Chrome / 27.0.1453.94 Safari / 537.36

Mozilla / 5.0 (PlayBook; U; RIM Tablet OS 2.1.0; DE-US)
AppleWebKit / 536.2 + (KHTML, like Gecko) version / 7.2.1.0 Safari / 536.2 +

Mozilla / 5.0 (Windows; U; Windows NT 6.1; DE-US) AppleWebKit / 533.20.25
(KHTML, like Gecko) Version / 5.0.4 Safari / 533.20.27

Mozilla / 5.0 (Macintosh, Intel Mac OS X 10_7_2) AppleWebKit / 537.36
(KHTML, like Gecko) Chrome / 27.0.1453.93 Safari / 537.36

Opera / 9.80 (Windows NT 6.1; WOW64; U; en) Presto / 2.10.229
Version / 11.62

Mozilla / 5.0 (Macintosh, Intel Mac OS X 10_7_2) AppleWebKit / 537.36
(KHTML, like Gecko) Chrome / 27.0.1453.93 Safari / 537.36

Mozilla / 5.0 (Macintosh; U; Intel Mac OS X 10_6_6; en-US)
AppleWebKit / 533.20.25 (KHTML, like Gecko) Version / 5.0.4
Safari / 533.20.27

Opera / 9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto / 2.9.168
Version / 11.52

Mozilla / 5.0 (compatible, WOW64, MSIE 10.0, Windows NT 6.2)

Mozilla / 5.0 (Macintosh; U; Intel Mac OS X 10_6_6; en-US)
AppleWebKit / 533.20.25 (KHTML, like Gecko) Version / 5.0.4
Safari / 533.20.27

Mozilla / 5.0 (Windows; U; Windows NT 6.1; DE-US) AppleWebKit / 533.20.25
(KHTML, like Gecko) Version / 5.0.4 Safari / 533.20.27 | Mozilla / 5.0
(compatible; WOW64; MSIE 10.0; Windows NT 6.2)

Mozilla / 5.0 (Linux; Android 4.0.4; Galaxy Nexus Build / IMM76B)
AppleWebKit / 535.19 (KHTML, like Gecko) Chrome / 18.0.1025.133 Mobile
Safari / 535.19

Mozilla / 5.0 (Windows NT 6.2; WOW64; rv: 21.0) Gecko / 20100101
Firefox / 21.0

Mozilla / 5.0 (MeeGo, NokiaN9) AppleWebKit / 534.13 (KHTML, like Gecko)
NokiaBrowser / 8.5.0 Mobile Safari / 534.13

Mozilla / 4.0 (Windows; MSIE 6.0; Windows NT 5.2) | Opera / 9.80 (Macintosh;
Intel Mac OS X 10.6.8; U; de) Presto / 2.9.168 Version / 11.52

Opera / 9.80 (Windows NT 6.1; WOW64; U; en) Presto / 2.10.229
Version / 11.62

Mozilla / 5.0 (PlayBook; U; RIM Tablet OS 2.1.0; DE-US)
AppleWebKit / 536.2 + (KHTML, like Gecko) version / 7.2.1.0 Safari / 536.2 +

Mozilla / 5.0 (Windows NT 6.2; WOW64) AppleWebKit / 537.36 (KHTML, like
Gecko) Chrome / 27.0.1453.94 Safari / 537.36

Mozilla / 5.0 (Android; Mobile; rv: 14.0) Gecko / 14.0 Firefox / 14.0

blocksize – What is the actual bitcoin block size? 2mb or 1mb?

The upper limit for the block size without witness data is 1000000 bytes.

There is no upper limit for the block size including the witness information. Instead, the block weight is limited to 4,000,000 weight units. Depending on the composition of the block, 4000000 WU may correspond to 1000000 bytes to almost 4000000 bytes (including witness information).

However, a block of 4,000,000 WU is "full", regardless of whether it is 1 MB or 3.8 MB of data.

Mining Pools – Can a block have multiple Coinbase transactions? Is there also a limit to the number of signatures that a multi-sig-transaction has or needs?

I'm wondering if a block with multiple Coinbase transactions can be created. The US government regulates mine pools that are in control of the miner's wallets. So it would be fabulous if this could be circumvented by having multiple coin wallet transactions with multiple sig wallets. Is there a limit to the number of signatures required for a multi-sig wallet?