[Bitcoin-development] vtxPrev

Michael Grønager gronager at ceptacle.com
Wed Oct 5 13:44:08 UTC 2011

Oups - I was reading the code wrongly - going through AddSupportingTransactions carefully again...

The vtxPrev contains a list of the supporting confirmations up to 3 confirmations back. So it is only of relevance (and only gets filled) if you accept coins that are less than 3 confirmations old. In this case you would like to resend the depending transactions to the network in case of chain splits.

This makes much more sense, but also, it is only of relevance when you accept newly earned coins. And it will only be of relevance for half an hour or so.



On 05/10/2011, at 14:50, Gregory Maxwell wrote:

> On Wed, Oct 5, 2011 at 8:31 AM, Michael Grønager <gronager at ceptacle.com> wrote:
>> The vtxPrev stores 3 transactions back, but as transactions need 7 block to maturity and respendability isn't it overkill - I mean it is highly unlikely that a transaction gets invalid after 7 confirmations and
> They don't need 7 blocks to maturity and respendability. The software
> will attempt to use older inputs when available but if not it will use
> what it has.  It's also prone to respending its own outputs quickly
> because it reasonably trusts that it won't doublespend its own
> transactions.
> And, yes, if there is a deep split then its possible that inputs might
> have been spent differently in the new split. But it's not especially
> likely. Retransmitting one of your own txn's parents if its dropped
> but not yet impossible sounds prudent to me.

Michael Gronager, PhD
Owner Ceptacle / NDGF Director, NORDUnet A/S
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E-mail: gronager at ceptacle.com

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