General topology – limitations of a local diffeomorphism

I wonder if a local diiferomorphism has (prove or disprove) the following property:

To let $ M, $ N be differentiable manifolds, and $ f: M to N $ be a local diffeomorphism. Accept $ Z $ is a closed subset in $ N $ so the restriction
$$
f | _ {f ^ {- 1} (Z)}: f ^ {- 1} (Z) to Z
$$

is a shame. Then there is an open neighborhood $ U $ from $ f ^ {- 1} (Z) $ in the $ M $ so the restriction $$ f | _U: U to f (U) $$ is a diffeomorphism.

Thanks!

Transactions – How are bitcoins programmatically sent without requiring a local copy of the blockchain?

I'm pretty new to Bitcoin development! I have seen the documentation above RPC Commands that are available if you have a local copy of the blockchain.

But I would like to know if it is possible to create and send send Transactions in the Bitcoin network without a local copy of the blockchain?

I use Java, but I try to avoid Bitcoinj. Currently I am trying to understand how everything works under the hood. I can add new addresses with the associated private keys (raw and WIFFormats). They work well!

With the API provided by blockchain.com, I can get information about these addresses and see if they have received any coins.

The only missing part for me is to find a way to be programmatic send Some coins from these addresses to other addresses, without a local copy of the blockchain (and with RPC calls on it).

Aha blockchain.com Also provides a wallet API. However, correct me if I'm wrong by using it she Control the private keys, right? I would prefer to send coins by creating and signing the transactions locally and then broadcast them yourself … without local blockchain.

Is it possible? What are the options?

scm – How to wait for a local git fork from a repo with many branches

I use a public git repository and tailor it to my specific needs. This means that the changes are not worth bringing together upstream.

Repo is in Github (upstream) and we maintain our own git server (origin) where the fork is stored.

The original repo is quite active and has more than 10 publishing branches and as many tags. I would have my own branches that will build on these publications

I think I have to merge the changes on a regular basis upstream on my own branches and then push this on mine origin,
Now question (s):

  • Is there a way that upstream in the repository itself? I mean, I want to clone the project from origin and I have the configuration for upstream already there.

  • What is the best way to keep my stores up to date? upstream: drag and merge locally and move forward originor is
    is there a better or more consistent way to do this?

json rpc – rpc API can not be called from another computer on the same local network

rpc api can not be called from another machine on the same local network

There is a test node on my local network that I can call rpc api Only from the node's machine, not from my local machine.

I know rpcallowip is changed in the current version https://bitcoin.org/en/release/v0.18.0#configuration-option-changes

http clinet httpie

IP of my local machine: 192.168.1.155

IP of the BTC node: 192.168.1.132

the harbor 8332 it is open.

$ bitcoind -version                 
# Bitcoin Core Daemon version v0.18.0.0-g2472733a24a9364e4c6233ccd04166a26a68cc65

I start testing and my IP is 192.168.1.155

bitcoind -regtest -deprecatedrpc=generate -printtoconsole -rpcuser=user -rpcpassword=password -rpcallowip=0.0.0.0/24 -rpcbind=127.0.0.1  -server -rpcport=8332

customer request

# request from btc node's machine
http POST http://user:password@127.0.0.1:8332 jsonrpc="2.0" method="getblockchaininfo" id=1
# successed

# request from my local machine 192.168.1.155
http POST http://user:password@192.168.1.132:8332 jsonrpc="2.0" method="getblockchaininfo" id=1
# http: error: ConnectionError: HTTPConnectionPool(host='192.168.1.132', port=8332): Max retries exceeded with url: / (Caused by NewConnectionError(': Failed to establish a new connection: (Errno 111) Connection refused',)) while doing POST request to URL: http://user:password@192.168.1.132:8332/

Local SEO help

I run a local cleaning service and find that competitors have websites that are all the same except to enter a specific city name. They really shuffle and crush me.
Is this a good idea? Will I be penalized for such tactics?
example
mycleaningco.com/town one cleaning
mycleaningco.com/town two cleaning
mycleaningco.com/town tree cleaning

All exactly the same content except for the insertion of the place name in the body text.
Thank you very much.

Google Sheets – How to Get the Latest Version Registered Spring Security client and save it to Thread Local. Then pass the value to the current tenant resolver class

Following the approach of the Hibernate Multitenancy database https://dzone.com/articles/spring-boot-hibernate-multitenancy-implementation I am developing a multitenant application in which approximately 500 users can log in at the same time option, a logged in user from Spring Safety to the CurrentTenantIdentifierResolver class.

Get the current logged-in client from spring security and set the value for the local thread modifier class

This is the local thread class that contains the currently logged on client

public class Modifier {

@Autowired
private Tenant tenant;


 private static final ThreadLocal CONTEXT = new ThreadLocal<> 
 ();



  public static void setTenantId(String tenantId) {

  CONTEXT.set(tenantId);

  }

  public static String getTenantId() {
    return CONTEXT.get();
  }

  public static void clear() {
    CONTEXT.remove();
  } 


 }

Here I am trying to get the value of the client from the local thread, but after login I get the client value as zero

package com.domain.multitenancy;





 public class CurrentTenantIdentifierResolverimpl implements 
 CurrentTenantIdentifierResolver   {

 String DEFAULT_TENANT_SCHEMA = "tenantId1";




@Override
public String resolveCurrentTenantIdentifier() {
String tenantId=Modifier.getTenantId();

if (tenantId == null) {
    return DEFAULT_TENANT_SCHEMA;

}

   return tenantId;

        }

@Override
public boolean validateExistingCurrentSessions() {
    // TODO Auto-generated method stub
    return true;
}



 }

This code was also used. Due to static loading during multi-tenancy, the instance has been updated each time and does not display the correct database associated with the user who is viewing a different database

public class Tenant {

private static String tenantId;


public static String getTenantId() {
   return tenantId;
}

public static void setTenantId(String tenantId) {
    this.tenantId = tenantId;



}

Network – Can DHCP in a network interface assign a local IP address that overlaps with the subnet of another interface?

iface eth0 inet dhcp

iface eth1 inet static
  address 192.168.1.1
  netmask 255.255.255.000

Can a host connect? eth0 and get assigned an address that is part of eth1Subnet domain (everything from 192.168.1.2 to 192.168.1.255)?

What negative consequences does this have in practice and is the expected (wrong) behavior deterministic?

Is there anything that can be done to prevent this while leaving the hotel? static and dhcp Methods unchanged? I could not find anything on the manpage.

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bitcoind – TimeoutError: [WinError 10060] If you try to connect to bitcoin rpc from a PC on the same local network

I have a laptop with Win10 installed. A full Bitcoin knot is now running perfectly. I am already able to use Python RPC requests from the laptop to get valid answers. The laptop is connected to the Internet via a LAN port on a router with wireless LAN option. The question now is: is it possible to issue Bitcoin RPC requests from another PC connected to the same router but over Wi-Fi? When I try, I get a timeout error that I can not recognize. I tried to insert a line into mine bitcoin.conf to possibly increase the timeout parameter like rpcclienttimeout=200 but it does not seem to work. The entire content of my configuration file looks like this:

server=1
daemon=1
txindex=1
rpcuser=***
rpcpassword=******
rpcallowip=192.168.1.0/24
rpcclienttimeout=200
#rpcallowip=127.0.0.1
#rpcconnect=127.0.0.1

Do I miss something? The IP of PC # 1 running the Bitcoin node is 192.168.1.104 and the IP of PC # 2, which is to get the access to the PC 192.168.1.102,

When I start the following Python code from PC 1, I get my alleged answers flawlessly. However, when I start the second Python script from PC 2, a timeout error occurs.

The code is executed by PC 1:

from time import time_ns as time
import csv
import numpy as np
import matplotlib.pyplot as plt
from rpcreq import *
import json
import os

def avg(L):
    return sum(L, 0.0) / len(L)

rpcPort     = "8332"
rpcHost     = "127.0.0.1"
rpcUser     = "******"
rpcPassword = "******"

serverURL = ("http://{user}:{password}@{host}:{port}").format(
        user=rpcUser,
        password=rpcPassword,
        host=rpcHost,
        port=rpcPort
    )

method = 'getblockcount'
params = ()
resp   = rpcreq(method, params, serverURL)
nBlock = resp('result')
iters  = nBlock
iters  = 100
print(nBlock)

BlockHash = (0)*(iters)
method1   = 'getblockhash'


start = time()
for pj in range(0, iters):
    params          = (pj)
    resp            = rpcreq(method1, params, serverURL)  
    BlockHash(pj)  = (resp('result'))
    print(pj)

end = time()
endtns = (end-start)/(iters+1)
endts = endtns / 1000000000
print('Each Reading Will Take: ', endts, 'Seconds.')
print('Reading All Block Hashes Will Take: ', endts*nBlock/3600, 'hours.')

x      = np.arange(0.0, iters, 1)
y      = BlockHash

x = (*x)
List = (
            ('Height')            + x,
            ('BlockHash')         + y,
        )

with open("BlockHashFirst{}.csv".format(iters), 'w', newline='') as rF:
    wr = csv.writer(rF, dialect='excel')
    for i in range(len(x)+1):
        wr.writerow((r(i) for r in List))

The code is executed by PC 2:

from time import time_ns as time
import csv
import numpy as np
import matplotlib.pyplot as plt
from rpcreq import *
import json
import os

def avg(L):
    return sum(L, 0.0) / len(L)

rpcPort     = "8332"
rpcHost     = "192.168.1.104"
rpcUser     = "******"
rpcPassword = "******"

serverURL = ("http://{user}:{password}@{host}:{port}").format(
        user=rpcUser,
        password=rpcPassword,
        host=rpcHost,
        port=rpcPort
    )

method = 'getblockcount'
params = ()
resp   = rpcreq(method, params, serverURL)
nBlock = resp('result')
iters  = nBlock
iters  = 100
print(nBlock)

BlockHash = (0)*(iters)
method1   = 'getblockhash'


start = time()
for pj in range(0, iters):
    params          = (pj)
    resp            = rpcreq(method1, params, serverURL)  
    BlockHash(pj)  = (resp('result'))
    print(pj)

end = time()
endtns = (end-start)/(iters+1)
endts = endtns / 1000000000
print('Each Reading Will Take: ', endts, 'Seconds.')
print('Reading All Block Hashes Will Take: ', endts*nBlock/3600, 'hours.')

x      = np.arange(0.0, iters, 1)
y      = BlockHash

x = (*x)
List = (
            ('Height')            + x,
            ('BlockHash')         + y,
        )

with open("BlockHashFirst{}.csv".format(iters), 'w', newline='') as rF:
    wr = csv.writer(rF, dialect='excel')
    for i in range(len(x)+1):
        wr.writerow((r(i) for r in List))

The second code is different only for the parameter rpcHost,
When I run the second code I get a complete error message as:

TimeoutError: (WinError 10060) A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

Any tips where I confuse the concept?