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Transactions are signed messages carrying out the transfer or generation of bitcoins. They are broadcast throughout the Bitcoin network and, if accepted, integrated in the blockchain.
1
vote
Recommended Transaction Size
It's not about size, it's about fee. If you can have a high enough fee to make a massively sized transaction be incentived to miners, your good. See transaction priority for what I mean.
4
votes
How do I get all the latest transactions from Bitcoin network using Python?
Blockchain.info uses a special system that doesn't involve Python (as far as we know), they're most likely using a modifed node that notifies them of transactions. … The hard way
If you want to listen to all latest transactions, and not to addresses you own, you're going to need more in depth control. Otherwise use Bitcoind and its walletnotify parameter. …
1
vote
Accepted
Why is a double hash of the previous transaction included in Txin?
I believe it is one of the principles of Bitcoin, to make transactions you first have to have a valid transaction it stems from. …
3
votes
1
answer
65
views
How to keep transaction generating time down?
I have a wallet for a service that's getting bloated, and whenever I want to send transactions they notably get slow. How do I prevent stuff like this? …
1
vote
Is access to mining the only obstacle to centralised bitcoin-like currency?
But without the publicly maintained blockchain, you really have only have a database that keeps track of transactions. …
0
votes
1
answer
236
views
Where/How does Bitcoin-qt check for receives to it's addresses?
How does Bitcoin-qt technically check for receives to it's own addresses. I know it has a list of addresses loaded in from the wallet.dat, but when a new block or new transaction arrives, what logic i …
2
votes
Is transaction malleability an issue when receiving payments?
The common mistake people/large exchanges make is when they constructed "withdraw" transactions from unconfirmed "deposit" transactions. Those invalidate quickly due to double spend rules. …
4
votes
1
answer
289
views
How safe is sending out transactions using unconfirmed inputs for a service?
Would it be safe for a service like Coinbase to use unconfirmed inputs on average transactions? Would I run into similar issues like MtGox did? …
2
votes
How to get a history of incoming and outgoing transactions for a certain address?
To get the history of incoming and outgoing transactions all you need to do is send "listreceivedbyaddress" command to the bitcoind rpc interface. For more detail see here. …
2
votes
Accepted
Creating secure architecture and payout process
Check the database every block looking for unprocessed transactions that have 6 confirms. Those that do should get marked as "processed" or get deleted from the database. …
1
vote
How can I tell whether transactions were (not) made via BitPay / Coinbase?
Only way is if Coinbase/Bitpay publicly released their addresses, which they won't.
0
votes
Is it possible to add a transaction input to a transaction in the mempool?
You can't, it would create a completely different transaction and the other would get invalidated as soon as one makes it to a miner and into a block.
3
votes
Is it possible to run bitcoind without downloading the blockchain?
It isn't possible with the current version of Bitcoind, Bitcoin-QT is simply a GUI wrapper for Bitcoind so same applies for both.
If you need a wallet that doesn't download the full blockchain go wit …
6
votes
1
answer
1k
views
How to handle a ridiculous amount of receiving addresses?
By ridiculous I mean something absolutely absurd. 1 million+ addresses. Like say if Amazon had started to accept payments, how could they possibly keep up? Bitcoind probably can't keep up? How would I …