How to double spend - ( With Custom fee )

[Roboabhishek]

While I was surfing online I found that there are some websites that provide that facility of double spend online.
But I want to know if they provide the option to do this with a custom fee.
These days bitcoin tx are taking so long to get a single conf.
So it will be nice to double spend if they take more than a day.

[pantek talacuik]

why you don't try to suck your dick first before it? maybe you'll get answered after that. Bitcoin confirmation never so long, it depends on your fee. Looks like you can't afford it 

[mocacinno]

While I was surfing online I found that there are some websites that provide that facility of double spend online.
But I want to know if they provide the option to do this with a custom fee.
These days bitcoin tx are taking so long to get a single conf.
So it will be nice to double spend if they take more than a day.

Creating a transaction doublespending unconfirmed inputs isn't that hard to tell you the truth... But indeed, if you use my site to create a double spending transaction, my wizard will chose the fee in your place, making sure it's sufficient...


bitcoin-cli createrawtransaction "[{\"txid\":\"thetxidwhichoutputyouwanttodoublespend\",\"vout\":[number of the output]}]" "{\"[receivingaddress]\":[amounttoreceivewithoutfee]}"

bitcoin-cli signrawtransaction "myhex"

[NorrisK]

And this is exactly the reason we need to wait for several confirmations nowadays..

If you simply use it to get your transaction through faster because it is stuck it may be ok, but don't try it when purchasing something..

[Xester]

While I was surfing online I found that there are some websites that provide that facility of double spend online.
But I want to know if they provide the option to do this with a custom fee.
These days bitcoin tx are taking so long to get a single conf.
So it will be nice to double spend if they take more than a day.

Why are you wasting your time learning how to double spend. At this time double spending can no longer occur due to the protection being made by the network. The reason why transactions are taking too long to confirm are due to spam attacks on the network and making a double spending will not make your transactions faster. In the end it is just a waste of time and a waste of bitcoin.

[goregrind]

One confirmation is as safe as it ever was, stop spreading FUD
zero confs were never safe.

[aso118]

While I was surfing online I found that there are some websites that provide that facility of double spend online.
But I want to know if they provide the option to do this with a custom fee.
These days bitcoin tx are taking so long to get a single conf.
So it will be nice to double spend if they take more than a day.

A successful doublespend is one in which you can spend your inputs again, after they are in a confirmed transaction.
What you are talking about is just creating another transaction with unconfirmed spent inputs.

[Red-Apple]

double spending is nothing weird, as mocacinno said, and you don't really need a tool or some kind of secret knowledge to do it. but the thing is when you double spend all the nodes that already have your previous transaction will reject your second one so propagating it will be hard.

besides all the services and merchants wait for at least 1 confirmation and those that don't wait will use either their own or third party tools to do some risk assessment and if there was a risk of double spend they won't accept your tx.

[franky1]

Why are you wasting your time learning how to double spend. At this time double spending can no longer occur due to the protection being made by the network. The reason why transactions are taking too long to confirm are due to spam attacks on the network and making a double spending will not make your transactions faster. In the end it is just a waste of time and a waste of bitcoin.

OP is on about double spending with services that accept ZERO confirms..

EG
TX A
send out a TX with a crap fee that you know will delay the Tx for an hour..
direct that TX toward the zero confirm service you want to scam..

then
TX B
when you get the instant service you were hoping for.
send the same unspent input(because its not confirmed) again.. but direct the output back to your wallet with a great fee.. (this is called RBF)

also prep the next tx(TX C) spending the (TXB)(still unconfirmed) to again go back to your wallet again with a great fee.. (this is called CPFP)
to really amp up the pressure for pools to accept txB and reject and never confirm TX A..

then you just wait for TX B to confirm and then TX C to confirm..
while the zero confirm service you want to scam.. gets scammed

yep even segwit does not solve this.
funny part is. core pretended removing malleability would fix double spending zero confirms... yet core then added RBF and CPFP.. making double spending still a big issue that remains unsolved

[Roboabhishek]

Well, i didn't get what I wanted to know.

Suppose I send a tx from multibit with 40k satoshi fee to a gambling website and it stayed there for 2 days.
Then how can I recover the amount?
In other words how to make another tx from multibit even when the tx is unconfirmed.

Also is there any offline wallet that I can use without downloading all the Blockchain database?

Thanks

[darklus123]

I am having a problem with my transaction. I send about $10 from my blockchain wallet to other wallet and my mistake was i only use a small fee which is .0001 stat and now it is stack up it is still not confirmed for more than 4 days and i think that double spending is the solution for my problem but i am not so familiar with it can someone explain it to me thanks