Topic: Chain Spam (Read 661 times)

ty Danny, appreciated

I think block bloat is an issue that needs to be discussed and resolved. Off-chain will be very necessary in the future.

Correct.  If the transaction has very small outputs and does not include a fee, most miners (and mining pools) will not include it in their blocks and it will not confirm.


The transactions will be stored in your wallet and your wallet will attempt to re-broadcast the transactions regularly.


The current version of the Bitcoin-Qt client (and many other wallets that are based on it) will refuse to acknowledge or relay any transactions that have extremely small outputs and a transaction fee of less than 0.0001 BTC.  Therefore, your transactions will have a very difficult time ever leaving your wallet.  If you do manage to connect to an old or modified client that someone is running, then yes, you can spam their memory and their bandwidth with such transactions.  This is the exact reason that small transaction fees for tiny outputs exist in the reference client.  Anyone who chooses not to implement the reference is willingly taking the risk of being spammed.


Miners that want to maximize their income will fill the next block with the transactions that pay the highest fees per kilobyte.  Any other transactions simply wait around until a block that is not full comes along.  This is why higher fees increase the likelihood that your transaction will be confirmed faster.

You are suggesting that inputs.io is safer than Electrum???

I think you have a VERY odd sense of the definition of the word "safe".

Op: with low fees, the transaction will not proceed (it will stay with 0 confirmation for days/weeks/months).... And won't be included in the blockchain.

Thanks for responses.

Alright I didnt think about the fees at all. What happens to transactions without / with super low fees? They simply don't get included if the one who mined the block doesn't want to right?

However, these non-blocked transactions must still show up somewhere, like be stored as "please insert me for free" somewhere? Is this still spam-able?

If there is enough transactions to take up more than 1 MB then what? The block can't take them and transactions stack up?

If the chain becomes too long, people will use online blockchain and wallets like blockchain.info ....
And you can spam transactions, but if you don't include fees, it will take a lot of time to proceed.

Unlikely.


It will cost you money, and it will make the miners (or mining pools) very happy to collect all those transaction fees from you.

• Solo miners
• Mining pools
• Anyone that wants to run a full node

Unlikely.  Unless the protocol changes, it can't grow by more than 1 megabyte per block.  On average there will be 1 block every 10 minutes, which works out to be 52,560 blocks per year.  At one megabyte per block that is only 56 gigabytes per year.  You can currently purchase a 4 terabyte drive for less than $200.  At a rate of 52.6 gigabytes per year, it would take 76 years to fill that drive.

You really think that larger rives won't be available at reasonable prices in the next 76 years?

i cant see bitcoin-qt ever dropping the way it uses the full blockchain otherwise the network will slow down alot

With clients like Electrum you dont need to download the blockchain. It might be used in bitcoin-qt as well in future if the blockchain grows to much higher size (not soon)

its not really possible and it got fixed wuite a few versions ago if the chain becomes to long i think it just adds them to the wait list for the next block

This is probably discussed and answered somewhere but

Can the chain become too long?

What if I spam transactions? Like send micro payments between millions of my own accounts?

How many places actually need to store the whole chain? I got it downloaded now but it's quite large already and it's probably gonna get longer faster than memory prices drop?!

Thanks