So which alt coins seem legitimate/solid?

[t3a]

If you are looking for a "different" coin take a look at Datacoin. It's a primecoin fork with just one modification, it adds a 128k data field to every transaction so you can store (small amounts of ) data into the blockchain, so far it's an interesting experiment since the coin itself have's a purpose, you pay fee's to store data into the blockchain. The possibilities/usages of this coin are endless and the killer app could be around the corner. Moreover it's one of the few coins that can peacefully coexist with BTC.
The coin is very new, but as I said, a very interesting experiment.

So after 8 million transactions it takes up a terrabyte? There must be something I'm missing because a DDoS attack or just a harddrive filling attack seems very feasible.

The maximum capacity of the network is approximately 520 Gb per (coin) year, that's deterministic, you can't do a "hard drive filling" attack as you called it. The maximum capacity of a block is 1 Mb, if this attack worked then transaction spamming (which worked at some point for Bitcoin) would also work, but measures where taken to avoid this kind of attacks a while ago for Bitcoin.
DDoS attack against a P2P currency ? Good luck. And that also applies to any crypto, not to mention it doesn't make much sense for the attacker.
And BTW, I am not saying this cryptocurrency is invulnerable, just saying that it's a very interesting experiment, and that's what the OP was asking for AFAIK.

>DDoS attack against a P2P currency? Good luck.

Seems pretty feasible. If I have ten nodes make 1mb of transactions per second I doubt the network could handle it.

[cryptrol]

If you are looking for a "different" coin take a look at Datacoin. It's a primecoin fork with just one modification, it adds a 128k data field to every transaction so you can store (small amounts of ) data into the blockchain, so far it's an interesting experiment since the coin itself have's a purpose, you pay fee's to store data into the blockchain. The possibilities/usages of this coin are endless and the killer app could be around the corner. Moreover it's one of the few coins that can peacefully coexist with BTC.
The coin is very new, but as I said, a very interesting experiment.

So after 8 million transactions it takes up a terrabyte? There must be something I'm missing because a DDoS attack or just a harddrive filling attack seems very feasible.

The maximum capacity of the network is approximately 520 Gb per (coin) year, that's deterministic, you can't do a "hard drive filling" attack as you called it. The maximum capacity of a block is 1 Mb, if this attack worked then transaction spamming (which worked at some point for Bitcoin) would also work, but measures where taken to avoid this kind of attacks a while ago for Bitcoin.
DDoS attack against a P2P currency ? Good luck. And that also applies to any crypto, not to mention it doesn't make much sense for the attacker.
And BTW, I am not saying this cryptocurrency is invulnerable, just saying that it's a very interesting experiment, and that's what the OP was asking for AFAIK.

>DDoS attack against a P2P currency? Good luck.

Seems pretty feasible. If I have ten nodes make 1mb of transactions per second I doubt the network could handle it.

That's called "transaction spamming" and it won't work. If it worked for Datacoin it would also work for BTC, also a fee is enforced to accept the transaction so the attack would also be really expensive.
And BTW I don't want to hijack the OP thread, we can discuss DTC attack vectors on another thread if you wish

[yasein]

I think protoshare (PTS) is great, they have full time developers and great concept, not just a fork

[satosh007]

This forum is for the most about sharing information,
reading through this thread with all said from those who have a background info. it would be great to see this thread evolved into a rating thread with (mods) for all existing/new alt/crypto currencies with cons and pros plus future based on clear comparison factors.
if this would be considered this thread might continue as the discussion with one for brief analysis ratings and future.
for the benefit of the community.

[satosh007]

This forum is for the most about sharing information,
reading through this thread with all said from those who have a background info. it would be great to see this thread evolved into a rating thread with (mods) for all existing/new alt/crypto currencies with cons and pros plus future based on clear comparison factors.
if this would be considered this thread might continue as the discussion with one for brief analysis ratings and future.
for the benefit of the community.

[babeq]

Quark coin seems good:
http://www.cryptocoincharts.info/v2/pair/qrk/btc/coins-e

[satosh007]

This forum is for the most about sharing information,
reading through this thread with all said from those who have a background info. it would be great to see this thread evolved into a rating thread with (mods) for all existing/new alt/crypto currencies with cons and pros plus future based on clear comparison factors.
if this would be considered this thread might continue as the discussion with one for brief analysis ratings and future.
for the benefit of the community.

[Snail2]

Sexcoin looks interesting .

[Jomppe]

DevCoin is a good alternative for speculatiion.
The long-term target rate for coin is 0,001 BTC.
Now it costs almost zero - it is very early coin but definetely the potential is there to make early adopters rich.
We all love doing charity - DevCoin is for this purpose. However, now as the price is so ridiculous low, there is no chance to do anything with the coin - this is why it must go up 10 000 times from these levels in order to serve its purpose.

[AltCoinSpeculation]

If one is going to invest in altcoins, why not spread the risk around? Sure, you won't end up with the same kind of ROI you could have ended up with had you gone all-in in the right altcoin but the chances of timing that one perfectly are pretty slim. I think a healthy bitcoin balance is a great part of a balanced cryptocurrency investing strategy. Bitcoins are much less volatile plus having them handy allows one to capitalize on favourable situations that arise (e.g. some pool miner wholesaling his altcoins which can be immediately resold for a profit).
[/quote]



I agree, keep some in Bitcoin, some in Litecoin, and then take a punt on the rest,
The longevity of most Alt Coins will depend on the amount of holders and the amount of uses for the coin,
the more dedicated the developers, and miners, and the strategy the coin community will determine if the coin will be around in a year or two from now, and at what price...


I wrote a report with some more thoughts download it here for free:
http://altcoinspeculation.com/

[Gridcoin]

Gridcoin is not a Scamcoin - Lets clear this up right now.

I'll vouch for that; we're not a scamcoin; I'll stand up to your challenge; Post some more information if you want anything clarified;
No pre-mine; Honest Devs; Benefits to humanity; Active development; Loyalty;
What more can you ask for


Grid

[hamiltino]

Gridcoin is not a Scamcoin - Lets clear this up right now.

I'll vouch for that; we're not a scamcoin; I'll stand up to your challenge; Post some more information if you want anything clarified;
No pre-mine; Honest Devs; Benefits to humanity; Active development; Loyalty;
What more can you ask for


Grid

and then............




Everyone shuts up.

[hypostatization]

XRP

Not just a deflationary currency, it is a vital component of the Ripple system itself.

A massive benefit of the Ripple system is that it is designed to support all currencies. It allows users to perform payment and exchange between all currencies. A user holding solely BTC, LTC, WDC, QRK, NXT, or even DOGE will be able to make purchases from vendors accepting only USD. It adds value to all currencies.

Ripple effectively eliminates need for centralized payment networks and exchanges, upon which Bitcoin and many other currency systems are threatened by. In addition: no 51% attack vulnerability, nor confirmation delays.

Brief video explaining a few core components of the system: http://vimeo.com/63784865

A smear campaign, led by reputed scammer TradeFortress, has spread a great of misunderstanding. Few people understand that it is designed specifically to combat the centralization threats that are looming over crypto currencies right now.

Great intro for people who already have an understanding of Bitcoin/alts: https://ripple.com/wiki/Introduction_to_Ripple_for_Bitcoiners

Ripple now supports direct cash deposits via ZipZap, and has a well funded company helping to drive the system forward. Ability to directly deposit cash to a decentralized exchange system is a massive step forward for finance.

Ripple Contracts is one of the most promising concepts out there for crypto currencies: https://ripple.com/wiki/Contracts#Example_Contracts

A unique edge is that Ripple is designed specifically to embrace all currencies, from crypto through fiat, rather than focusing on competing against them.

Considering all of the above, XRP has an incredibly promising future.

[wontonforevuh]

dogecoin is one of the largest and most well known

[lalakies23]

You wouldn't even bother asking if somebody already told you about Betacoin .

Don't need to say more, it is everywhere.
I've seen people who didn't even know Bitcoin to Buy Betacoins. What else to you need?
This crypto will have a bright future.
As i hear several eshops are developed for Betacoin and the Block explorer will be something you even haven't seen before.

I 've switched all my mining horsepower from BTC to Betacoins.


You can thank me later for announcing it to you this early.

[Dilapidated]

Stablecoin - coin mixing service
Earthcoin - great community and devs
Ripple - amazing support of currency and ease of use

These are my top 3 coins