Ninjastic
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Board Altcoin Discussion
Re: Security analysis of PoW/PoS hybrids with low PoW reward
by
rat4
on 02/04/2014, 13:28:37 UTC
Quote from: tacotime on April 02, 2014, 01:10:43 PM
Quote from: rat4 on April 02, 2014, 01:06:39 PM
Quote from: tacotime on April 02, 2014, 12:58:33 PM
Told OP it was a bad idea, was ignored by OP in the Blackcoin thread. If you don't understand the code you're modifying, don't muck with it.

These attacks are not applicable to BlackCoin. Guess why.

My guess is that you modified the trust weighting for PoS blocks so that PoW block or that you manipulated timestamping variability, neither of which are great solutions in the distributed system you're playing with.

It looks like you tried to fix the stake modifier with a hardfork and then broke it in the process, too:
https://github.com/rat4/blackcoin/commit/47d2eec662b738b39cdb45f3ef6f72a13b929268#diff-25d902c24283ab8cfbac54dfa101ad31
https://github.com/rat4/blackcoin/commit/9dea231970c5c73dd6b7e3d0d20210233574a179#diff-25d902c24283ab8cfbac54dfa101ad31

Others vulnerabilities exist and you still refuse to address them (the "nothing at stake" fork, stake modifier manipulation).

Zero difficulty PoW is open door and cannot be trusted. One of possible fixes is to disable PoW.