PPC.
- The first Proof of Stake coin. First mover advantage. Most liquid PoS coin.
- What are your experiences with PPC? Does the wallet have to be open to mine?
Yes. If not, it would be insecure. But there is a mechanism in development called "cold locked minting" (see below) that will allow riskless minting.
- There are now other PoS coins. And there's an improvement on PoS - DPoS. I feel like if PoS will succeed, it will move in the direction of DPoS, meaning bitshares.
DPoS means that "little coin owners" lease their "voting power" (stake) to the big whales, so they don't need to be online all the time. The risk is that these whales can use this power to 51%-attack the coin. PPC 0.5 will have a mechanism a bit similar to DPoS called Cold storage minting, and NXT too has a similar mechanism, Leased Forging. The difference is that DPOS and Leased Forging are encouraging centralization, while PPC's Cold-locked minting does not, it tries to avoid the danger of having accounts with a too large stake.
PPC's cold-storage minting (see
a technical description here) allows to delegate your stake to another account. This "minting account" must be online to mint, but doesn't need to have coins in it, so it's 100% safe to mint and you could do it even with your smartphone. But it does not allow the formation of "minting pools" or "big delegates" like in BTS and NXT, because there must be trust between both accounts. In my opinion, it's the best of all three "delegation" systems, but it's still in testing stage (but already implemented, so it's not vaporware).
NXT.
- First(?) "bitcoin 2.0". Most liquid 2.0 coin. First mover advantage.
That depends how you define "a 2.0 coin".
First with a own codebase, not being a clone? That was probably
Timekoin or
Bytecoin.
First coin not relying on proof-of-work? That was Timekoin, then came Peercoin, the first PoS coin.
First coin with coloured coins / asset exchange? That in fact was Bitcoin, with the Mastercoin "plugin"
First coin with Java client? Not even this, because there's Bitcoin's Multibit
But I like NXT, it is moving forward very fast and already has a lot of unique features.
- PoS, wallet must be unlocked to mine?
You can lease your stake to a big whale (see above "Leased Forging"), so you must not be online.