Monero is the most widely-used highly-fungible cryptocurrency, and it has a good record for being secure/stable.
Incorrect. It has a horrible
historical record
as proven by Andrew Miller a widely respected cryptographer.
As for the increase in minimum ring signature mixin level, the Cryptonote upgrade to RingCT, and the 2014 MNL-001 Monero labs research report, that was all rebutted
in great detail.
Monero
Fungibility is very useful, and the way it is done in Monero is quite good,
Monero is lacking
the type of fungibility that Bitcoin-SegWit is about to be slayed with. Zerocash technology has the required type of fungibility:
If the outcome I'm positing comes to fruition, it will mean that every fork of Bitcoin is a threat which requires coloring UTXO based upon their age, with older UTXO worth more than newer. Because buyers will value older UTXO more, since less probability of being stolen by a chain reorganization .
This is death to Bitcoin as a decentralized, fungible token system. Cryptonote/Monero anonymity could not help, because ring signatures only attempt to obscure potential sender identity, but do nothing to obscure the timing of UTXO formation. Whereas, the Zerocash zkSNARKs anonymity technology does obscure the timing of UTXO formation!
Its method of anonymization has very severe scaling downsides, however; Monero makes Bitcoin look Visa-scale.
Correct. And after they do the rigorous math to determine what level of ring mixins are required to counteract all threats, the scaling will at least get worse than it already is, if not be totally debunked as a viable anonymity solution.
Besides
PoW is not secure on altcoins; and that is worse on an anonymity coin that employs explicit rings, because it makes it
theoretically a honeypot (and by theory we mean probably already is and it is impossible to disprove or prove it is already).
Any way, PoW is entirely incentives incompatible as block reward declines and most revenue comes from transaction fees.
And no, Byzcoin didn't fix the insoluble problem.
PoW can only function with perpetual inflation or a mining oligarchy.
Sorry for all the bad news. Reality sucks.
Bitcoin Cash is not an altcoin. It is Bitcoin.
LTC is a useless copycat scam.
When
the difficulty "attack" starts on BTC-SegWit, then both BCH and LTC will rise as BTC declines in a spiral,
because BCH doesn't have SegWit thus BCH can't scale offline.