Already a week old, but this talk given by Andreas Antonopoulos on youtube was very interesting if you want to understand how the blockchain works.
https://www.youtube.com/watch?v=sE7998qfjgkI contest one comment in the Q&A session at the end where he says that the 9 years that Bitcoin has sailed "under the radar" makes their blockchain far more secure than can be done today. I contest this because I feel that at a certain point, it's impossible anyway, as per the structure of the blockchain and protocol, it is virtually impossible to make a new chain after 100 blocks, therefore, mining rewards are paid out after only 100 blocks.
Also, a new coin can do basically, what Evan did with DASH/DRK. Create an asic resistant algorithm, and buy yourself the time you need to lock in the blockchain to the point it can't be recreated within the time allotted (~10 min for bitcoin and 2.5 min for DASH)
The transition to ASIC, which will happen, is the danger point. At any point, including for Bitcoin, if suddenly technology is put online that is so powerful that a new chain can be created, and the existing chain changed, the miners can screw things up. But really, they would only be able to change a few blocks tops, if this technology were hidden from the masses and only one malicious entity received it and it was so powerful as to be greater than 51% of the combined network or more. In other words, I feel that all POW coins have the same risk after a certain point, and it's at the tip/latest blocks of the chain that are in danger.
So I kind of take issue with that logic, though it sounds good when it comes from AA. I think it's more propaganda than reality ;P (I still love ya, AA!) LOL
Anyway, that was a super insightful lesson on exactly how the chain works, how proof of work works, and what happened last week with the bitcoin fork. Which, by the way, opened our eyes to the cheat miners are doing (not validating the blocks before hashing the next one) It cost miners a lot of money, but they probably still made more coin by finding blocks faster than anyone else (by not taking the time to validate) and will probably continue to do this. And they'll get away with it until there is another update to the core requirements that cause a hiccup again (a year from now) still making it a profitable thing to do.
Hence, everyone that works like Bitcoin must find a way to stop this cheat. It's very unhealthy.