Quote from: BTSdac on January 07, 2015, 06:42:33 AM

Quote from: Riverhead on January 07, 2015, 04:56:48 AM
Not sure about the others but for a DPOS attack you'd need currently about 9.3% of supply so you could vote in all your own candidates. Currently that's about $3.5MM worth of BTS. Though I'm sure buying nearly 10% of the total supply would put some upward pressure on the price :).

he ask DPOS not BTS .  there are totally different
like cost of 51% attack of POS, theory you should have 51% coin ,but many coin didn`t join forge ,like NXT  so there are different

You are correct. My bad.

Sent from my Timex Sinclair

Quote from: liondani on January 07, 2015, 12:31:29 PM

Quote from: heyD on January 07, 2015, 10:27:27 AM
in fact, techically speaking at this moment you don't need 51% of stake to attack BTS, 16% are enough. if you have that much stake you can vote all of your 101 delegates in, which means you take full control of the whole dpos network since right now the delegate which gains most votes is only supported by less than 16% stake. when you do so, you can have all of your delegates disabled block production.

or with a 10% stake you can control over the half of delegates and sign on a alternative "main" chain (?)

yes, I think so. with 10% stake you can control 57 delegates at this moment, then reject all the blocks signed by the rest 44 delegates and also exclude the transactions which don't vote for you. but we are only talking about this technically.

Quote from: heyD on January 07, 2015, 10:27:27 AM
in fact, techically speaking at this moment you don't need 51% of stake to attack BTS, 16% are enough. if you have that much stake you can vote all of your 101 delegates in, which means you take full control of the whole dpos network since right now the delegate which gains most votes is only supported by less than 16% stake. when you do so, you can have all of your delegates disabled block production.

or with a 10% stake you can control over the half of delegates and sign on a alternative "main" chain (?)

Quote from: xeroc on January 07, 2015, 10:29:03 AM
... though "malicious" stake can be frozen in a hard fork ..

i don't know much about nxt, would a hard fork with malicious stake frozen solve the attack to nxt ?

... though "malicious" stake can be frozen in a hard fork ..

in fact, techically speaking at this moment you don't need 51% of stake to attack BTS, 16% are enough. if you have that much stake you can vote all of your 101 delegates in, which means you take full control of the whole dpos network since right now the delegate which gains most votes is only supported by less than 16% stake. when you do so, you can have all of your delegates disabled block production.

http://bytemaster.bitshares.org/article/2015/01/07/The-Most-Decentralized-Proof-of-Stake-System/

Quote from: Riverhead on January 07, 2015, 04:56:48 AM
Not sure about the others but for a DPOS attack you'd need currently about 9.3% of supply so you could vote in all your own candidates. Currently that's about $3.5MM worth of BTS. Though I'm sure buying nearly 10% of the total supply would put some upward pressure on the price :).

he ask DPOS not BTS .  there are totally different
like cost of 51% attack of POS, theory you should have 51% coin ,but many coin didn`t join forge ,like NXT  so there are different

Not sure about the others but for a DPOS attack you'd need currently about 9.3% of supply so you could vote in all your own candidates. Currently that's about $3.5MM worth of BTS. Though I'm sure buying nearly 10% of the total supply would put some upward pressure on the price :).

I read an article about DPOS vs POW and POS. In this article, bytemaster stated that 51% cost on DPOS is higher than other POS or POW, but I'm still wondering whether there is a specific numbers about it. Can someone explain about it and provide specific numbers?