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Topic: How many confirmations to be sure about a transaction? - page 3. (Read 3620 times)

full member
Activity: 126
Merit: 100
It will be 6 confirmations to be 100% sure.
sr. member
Activity: 420
Merit: 250
i believe that 2 confirmations might be enough for counting the deposit as it would be really hard to fake something with 2 confirms
hero member
Activity: 756
Merit: 500
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?
1 confirmation is usually enough,however if you are dealing with very large numbers id be on the safe side and wait for atleast 3 confirmations.
legendary
Activity: 1302
Merit: 1068
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?

Many exchanges use 6 confirmations to be sure that it is not a duplicate transaction. However there are other services that only use 3 and other only use 1 confirmation. But to be sure I guess you'll need 6

Even 1 conformation also accepted in some services. It's solely dependent on how much risk you're ready to take. I believe waiting for 3 confirmation are moderate policy for both the parties.

When i buy games or stuff online, it typically go through instantly, but if you end up scamming them, you're the one in trouble since they have your personal information. I understand for anonymous services, waiting for confirmation is an absolute must, however.
hero member
Activity: 826
Merit: 1000
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?

Many exchanges use 6 confirmations to be sure that it is not a duplicate transaction. However there are other services that only use 3 and other only use 1 confirmation. But to be sure I guess you'll need 6

Even 1 conformation also accepted in some services. It's solely dependent on how much risk you're ready to take. I believe waiting for 3 confirmation are moderate policy for both the parties.
hero member
Activity: 504
Merit: 500
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?

Many exchanges use 6 confirmations to be sure that it is not a duplicate transaction. However there are other services that only use 3 and other only use 1 confirmation. But to be sure I guess you'll need 6
newbie
Activity: 84
Merit: 0
I use localbitcoins.com and they require at least 3 confirmations.
hero member
Activity: 630
Merit: 502
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved (reversed)?

Most have been said above. I want to add that 1-2 confirmations is enough under normal network conditions. A few weeks ago, didn't we have a SPV mining issue where a few pools kept mining down the invalid fork? I remember users were advised to raise the bar to 12 confirmations. I would suggest "6" to a newbie just in case.
Yes. However, the confirmation only affected SPV clients and older Bitcoin Core clients which do not verify whether the block complies with the network rules. If you run the latest Bitcoin Core version, you would not be affected by it.
hero member
Activity: 798
Merit: 1000
Move On !!!!!!
i think it is enough to get only one transaction as most gambling websites accept deposits with only one confirmation

Actually, most don't. Most gambling sites allow you to start betting with your deposit with 1 confirmation, you can't withdraw your winnings until your deposit has 6 or more confirmations.

As far as I know you don't need even this one confirmation! I bet on sports using NitrogenSports and Directbet and they allow you to place bets with unconfirmed transactions.

It's not like you will run away until your bet (games) don't finish.
legendary
Activity: 952
Merit: 1005
--Signature Designs-- http://bit.ly/1Pjbx77
i think it is enough to get only one transaction as most gambling websites accept deposits with only one confirmation

Actually, most don't. Most gambling sites allow you to start betting with your deposit with 1 confirmation, you can't withdraw your winnings until your deposit has 6 or more confirmations.
hero member
Activity: 658
Merit: 500
i think it is enough to get only one transaction as most gambling websites accept deposits with only one confirmation
hero member
Activity: 770
Merit: 500
Usually you can trust it with just 1 confirmation. However if you are dealing with people who are acquaintance, counter-partner or dealers, I suggest 8-10 confirmations
legendary
Activity: 952
Merit: 1005
--Signature Designs-- http://bit.ly/1Pjbx77
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved (reversed)?

Most have been said above. I want to add that 1-2 confirmations is enough under normal network conditions. A few weeks ago, didn't we have a SPV mining issue where a few pools kept mining down the invalid fork? I remember users were advised to raise the bar to 12 confirmations. I would suggest "6" to a newbie just in case.
legendary
Activity: 3248
Merit: 1070
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?
3 confirmations is the most common figure that all the escrows of the forum tends to choose.
double spending is not possible after that...

there are other forms of attack that can succeed after 3 confirmations and up to evne 5 confirmations, check the weakness of bitcoin

i would wait few conf for small transactions and all the confirmation needed for big transaction
hero member
Activity: 938
Merit: 1000
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?
I think one transaction should be enough. Mostly bitcoin payment use one transaction to confirm it.

But to make sure, six transaction is much better.
hero member
Activity: 630
Merit: 502
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?
3 confirmations is the most common figure that all the escrows of the forum tends to choose.
double spending is not possible after that...
Double spending will always be possible even after 6 confirmations given that the attacker controls a huge portion of the network hashrate (100% success rate for 51%). It is however true that it will get more difficult after more confirmations.
sr. member
Activity: 410
Merit: 250
Hello,
how many confirmations should a Bitcoin transaction have in order to be sure that the transaction could not be resolved?
3 confirmations is the most common figure that all the escrows of the forum tends to choose.
double spending is not possible after that...
newbie
Activity: 56
Merit: 0
Hi i would say...

1 confirmation for low risk or low btc amount eg coffee

6 confirmation for high risk high btc amount eg  trading on btc exchanges

Stay safe!

cheers :-)
LondonTrader
hero member
Activity: 630
Merit: 502
One confirmation is enough for daily transaction and the risk is very low. After six confirmations, the only viable method to reverse a transaction is to execute a 51% attack. You don't need 51% of the network to execute it successfully but with it, you are almost certainly going to succeed. The more the confirmation, the harder it is to reverse. It is not possible to reverse blocks before the last checkpoint.
legendary
Activity: 1302
Merit: 1068
6 confirmations is super safe, and is also a completely arbitrary number that the core devs came up with several years ago. In reality, you only need 1 confirmation to be relatively safe and 3 for large transactions just to be sure. In most cases, you can accept unconfirmed transactions, although with those, you should check the fee and for any dust outputs just to make sure that it will get confirmed.

Might be good to point out that the wallet itself typically do not let you spend coins before 3 transactions. At least the one i used so far. So it would be a good ballpark as to what is safe.

But in truth, i never had any problem with 1 confirmation, which make it too late to submit another transaction afterwards with a higher fee to create a double spending attack.

I have to agree 6 is the go to if you're talking about a critical amount of money.
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