Unconfirmed transaction

[CasinoWinner]

OK OK, I know there are 1000 threads on this, i have googled for about a day, but my question is very specific.

A few days ago I was testing sending transactions without a fee (with minor amounts), they all got confirmed within 24 hours.

Yesterday I made a transaction (1.5btc), I didnt deliberately forget the fee, I forgot to change the fee back in the blockchain.info settings.

Its been over 31 hours and it is still unconfirmed.

I thought after 30 hours it gets dropped by the blockchain if it has no confirmations.


I cant doublespend, because it takes years to download the bitcoin qt (even with the bootstrap).

So, Initially I thought the waiting time was 30 hours. It looks like it isnt.

Any idea on when it will get dropped?
I cant afford to have this in limbo.

[Mitchell]

I always thought that a transaction gets dropped after a few days, not 30 hours. Not sure about it though, sorry man.

[CasinoWinner]

I always thought that a transaction gets dropped after a few days, not 30 hours. Not sure about it though, sorry man.

damn...a few days....

that realllllyyy sucks. :/

Is there another way to doublespend without downloading the blockchain?

[Mitchell]

I always thought that a transaction gets dropped after a few days, not 30 hours. Not sure about it though, sorry man.

damn...a few days....

that realllllyyy sucks. :/

Is there another way to doublespend without downloading the blockchain?

You could import the private key into Electrum and double spend from there to an address that you control.

[CasinoWinner]

I always thought that a transaction gets dropped after a few days, not 30 hours. Not sure about it though, sorry man.

damn...a few days....

that realllllyyy sucks. :/

Is there another way to doublespend without downloading the blockchain?

You could import the private key into Electrum and double spend from there to an address that you control.

ooo, thanks.

Would I just need to import my priv key?

I tried this with multibit yesterday, but the transactions still appeared in the wallet, with no confirmations.

In elect rum it still shows as uncofirmed and not enough funds :/

[Mitchell]

ooo, thanks.

Would I just need to import my priv key?

I tried this with multibit yesterday, but the transactions still appeared in the wallet, with no confirmations.

In elect rum it still shows as uncofirmed and not enough funds :/

You need to import the private key (or keys) from which you send the transaction. Not the private key that receives the transaction. It has been a while since I needed to do a double spend and I am a bit vague about it. Maybe Google (or someone else) can help you out if that fails.

[CasinoWinner]

ooo, thanks.

Would I just need to import my priv key?

I tried this with multibit yesterday, but the transactions still appeared in the wallet, with no confirmations.

In elect rum it still shows as uncofirmed and not enough funds :/

You need to import the private key (or keys) from which you send the transaction. Not the private key that receives the transaction. It has been a while since I needed to do a double spend and I am a bit vague about it. Maybe Google (or someone else) can help you out if that fails.

OKOK.

I have imported the right priv key.

It shows the funds.

BUT, heres the hard part.

It has I have the funds, with no transactions of it being spent (I synchronized with an older blockchain).

When I try to spend it (move it), I get the popup window "Not Enough Funds".

[DannyHamilton]

Bitcoin is designed to prevent double spending as much as possible and to make it as difficult as possible to do.

It won't matter what wallet you try to use (electrum, Multibit, Bitcoin Core, blockchain.info, Armory).  All the peers on the network already know about the old transaction.  Therefore, they will all refuse to relay a double spend transaction from your new wallet. All the miners (and mining pools) already know about the old transaction.  Therefore they will all refuse to accept a double spend from your new wallet.

The only way to double spend is to wait a few days for all the peers and miners to drop the existing transaction from their memory pool.  By then, blockchain.info will also have dropped the transaction from your blockchain.info wallet as well.  At that time you can send a new transaction that uses the same inputs.  That double-spend transaction will then be relayed and confirmed.

[CasinoWinner]

Bitcoin is designed to prevent double spending as much as possible and to make it as difficult as possible to do.

It won't matter what wallet you try to use (electrum, Multibit, Bitcoin Core, blockchain.info, Armory).  All the peers on the network already know about the old transaction.  Therefore, they will all refuse to relay a double spend transaction from your new wallet. All the miners (and mining pools) already know about the old transaction.  Therefore they will all refuse to accept a double spend from your new wallet.

The only way to double spend is to wait a few days for all the peers and miners to drop the existing transaction from their memory pool.  By then, blockchain.info will also have dropped the transaction from your blockchain.info wallet as well.  At that time you can send a new transaction that uses the same inputs.  That double-spend transaction will then be relayed and confirmed.

DAMN.
thats exactly what I didnt want to hear...
Oh well :/ I guess I gotta wait

[Mikez]

Also, here is a very good read: FAQ: All About Unconfirmed 0 Confirmation Transaction Fee (READ before posting!)
It's a stickied thread in the Technical Support section.

[Peter882]

I always thought that a transaction gets dropped after a few days, not 30 hours. Not sure about it though, sorry man.

Yup from what I heard of, it gets dropped after a few days as well.
But I have a question here, will blockchain.info automatically rebroadcast the unconfirmed transactions, like what bitcoin-qt would do? 

[DannyHamilton]

I always thought that a transaction gets dropped after a few days, not 30 hours. Not sure about it though, sorry man.

Yup from what I heard of, it gets dropped after a few days as well.
But I have a question here, will blockchain.info automatically rebroadcast the unconfirmed transactions, like what bitcoin-qt would do? 

Unless they have recently changed their policy, blockchain.info does not re-broadcast transactions.  If they have not confirmed after a few days, blockchain.info removes the transaction from their database making it possible for you to create a new transaction that spends the same inputs.

Note: It is possible for the recipient of your transaction (or anyone else on the bitcoin network) to re-broadcast the transaction.  If this happens, then the transaction will re-appear in the memory pool of all peers and will re-appear in the blockchain.info database.

[Velkro]

interesting topic for all beginers to read
smth new to know for me too

[ranochigo]

It is either you have a lot of inputs or outputs. It depends totally on the size, age of coin and amount of BTC in the output. The transaction will most likely be dropped very soon but it totally depends on the behavior of the client. Also, could you post the TXID so we can better understand about it?