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Dan Hughes Profile picture
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10 Apr, 3 tweets, 2 min read
I know many projects in #crypto are using the milagro libraries for #BLS, especially #java projects.

It's a good lib, but is *slow* & the newer version of it doesn't have some stuff I need.

You can find an optimized version at

github.com/DanoshiFusermo…

...
Most of the optimizations are mid/high level & don't touch any math. Mainly hand optimized loops, memory use & allocations, removing redundant ops etc

Improvement yields ~ 2x on signing, ~5x on aggregation and ~4-5x on verification.

I need to write many tests, use with care!
Oh there was also a pretty critical bug when doing concurrent signing / verification.

This is fixed also.

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Dan Hughes Profile picture
27 Mar
Throughout the day a few folks have correctly noted that there are indeed hybrid consensus platforms such as $dot #symbol #eth2 & others.

However there's a subtle but important difference in #cassandra that perhaps warrants "hybrid" as the incorrect term.

Clarification then...
As far as I understand, these solutions are essentially two separate consensus mechanisms.

Probabilistic to perform state transitions, with deterministic to finalise the best version of the former.

It works & does the job required, so why is #cassandra different?

....
Think of a hybrid car. There is a petrol engine & electric motor working together to move the car.

They are 2 separate systems & are open loop, one way. The engine if needed can generate electricity for the motor, but the motor doesn't produce anything useful for the engine...
Read 15 tweets
Dan Hughes Profile picture
27 Mar
One key area of research I'm doing with #cassandra is testing hybridization of deterministic & probabilistic consensus models.

Successfully doing so would provide an almost "best of both worlds" type model.

...
Probabilistic (#nakamoto) has strong liveness guarantees but is never really safe.

Deterministic (classical) guarantees safety but is difficult to resolve both liveness and safety issues. Usually requiring some #godmode
The #cassandra approach has 2-phases.

The 1st phase is probabilistic promoting liveness to a strong guarantee.

The 2nd phase receives the output of the 1st phase and produces a classical 2f+1 safety threshold.
Read 8 tweets

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