i think BURSTs PoC (proof of capacity) algo is worth to look closer at because it removed the PoW and PoS design flaws (long term secure affordable decentralization).
since the algo is based on precomputed data comparable to rainbow tables there is no way to develop special centralized hardware like asics for it (in terms of running costs as capacity replacement).
for the decentralization this means everyone can buy regular hdds in the next shop around the corner or use spare capacity.
compared to PoW there are almost "no" running costs.
the coin exists for over a year now and instead of having a whitepaper it has a over 1000 pages long bitcointalk thread here:
https://bitcointalk.org/index.php?topic=731923.0"Perhaps the most serious security issue with Burstcoin is that it allows for time-memory
trade-offs: a miner doing just a small amount of extra computation can mine at the same rate as an honest miner while using just a small fraction of the disk-space that an honest miner would."