51% attacks are solved in #piratechain ... no need to reinvent the wheel ... Plus zksnarks in $ARRR offer cryptographic security over security thru obscurity.
Discussion
The only issue that ARRR has privacy-wise is in the zk-SNARKs: Trusted setup.
ARRR is trusted, XMR is trustless.
https://medium.com/@fedemar568/pirate-chain-the-dark-side-of-the-privacy-coin-ad5989de1a98