Zcash releases new privacy tech: improved zk-SNARKs

Zcash developers launch new privacy tech called zk-SNARKs
13 September 2017   2478

Zcash team has done a really great job recently. Thus, a couple of days ago they reported on the news about Atomic Trades development. 

Now, the developers announce its next major upgrade, the new privacy technology called zk-SNARKs.

Matthew Green, Ian Miers and I are happy to announce that we have made significant performance improvements to the zk-SNARKs that Zcash uses. These improvements are being published open source, free of patents, for the broader crypto community.

Sean Bowe 
Zcash developer

Thus, Zcash uses the bleeding-edge cryptographic technique zk-SNARKs to hide balances and user addresses. Now, a living prototype of a new form of zk-SNARK is released. It is believed, that this would ead to the huge improvements in speed.

As reported, Jubjub, an elliptic curve which is efficient to perform operations on inside of zk-SNARK circuits, is built over the new BLS12-381 curve.

We achieve record-breaking performance for fixed-based exponentiation.

Sean Bowe 
Zcash developer

According to the team, "fast elliptic-curve cryptography in this context allows to use more efficient primitives for commitment schemes and collision-resistant hashes". Combining the various techniques, the team can get a rough idea of the performance improvements.

Zcash zk-SNARK perfomance improvements Zcash zk-SNARK perfomance improvements

Thus, this rough estimate indicates an 80% reduction of proving time, and a 98% reduction in memory usage which is a key requirement for opening up mobile support for Zcash shielded addresses.

Therefore, Zcash will be rolling out the technology in an upcoming upgrade, Sapling, expected in 2018. The change is scheduled to occur as a hard fork, meaning all users and miners will need to upgrade their software to take advantage of it.

Vinnik Extradtion to France to be Supported by SCoG

Alexander is holding the hunger strike for 24 days and lost around 9 kilos
19 December 2018   22

Following the trial court of the city of Thessaloniki, the Greek Areopagus decided to extradite Alexander Vinnik, suspected of laundering $ 4 billion through the BTC-e cryptocurrency exchange, to France. Thus, the appeal of Russian lawyers was rejected, reports TASS referring to the chairman of the court Angelique Aliferopoul.

After the announcement of the verdict, Alexander Vinnik declared that he would continue the hunger strike against the arbitrary rule of the Greek authorities, which began in mid-November.

I have been starving for 24 days. Yesterday I was weighed; according to the documents, I lost 8 kg. But they did not immediately begin to weigh me, only on the third day. So I lost 9 kg. If I'll be extradited to Moscow, I will stop starving.

Alexander Vinnik


Alexander Vinnik was detained in Greece at the request of the American authorities on July 25, 2017. In June 2018, Vinnik was arrested in absentia in Russia on charges of cyber fraud on a large scale.

At the moment, there have been several court decisions on the extradition of Vinnik - at the request of the United States, at the request of France and two decisions at the request of Russia. The final decision on the case will take the Minister of Justice of Greece.