So after the PoW phase, (3 weeks) then block reward is only 1 coin. And then all PoS minting. But to mint PoS you only need to turn on your wallet once every 20 days. So who will be running the block chain (securing transactions) after PoW phase?
this is what i was wondering too.
i assume its still PoW from miners, but with no one mining (or very few) it would be very easy to 51%.
someone please correct if I'm wrong
PoS takes over as the dominant mining process, and as coins age at from the point they were mined, someone will always be minting somewhere to generate new network blocks. To 51% attack with PoS you'd need to hold 51% or more of all Mint,
False.
This is not true. Similar to PoW
That's a false statement. Proof-of-Stake isn't similar to Proof-of-Work because it's cost-free. Unlike Proof-of-Work, you can retry attack attempts multiple times using the same coins.
thats subject to a 51% attack, the PoS will need to hold 51% coins in order to be able to attack the coin. But holding 51% and then attacking your own coin normally is not in your interests.
You
don't need 51% of coins to perform a successful attack. You only need less than 15% of
active weight here.
ATTEMPTS = 1 / STAKE ^ CONFIRMATIONS
If you have 25% of
active weight then you need ~256 attempts;
If you have 15% of
active weight then you need ~1975 attempts;
If you have 10% of
active weight then you need ~10000 attempts.
Note that active weight has no direct relation with total supply. It's calculated as (volume * timeweight) for coins participating in the network protection. E.g. if there are only 50% of coins @ maximum timeweight used for stake generation, then you need ~7.5% of total coins volume in order to perform double-spend attack for the reasonable time.