Zcoin Development Update 9 May 2019

Development
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Sigma

  • Sigma testnet launched
  • Identified issues on invalidateblock, disconnect block and corrupt sigma global state in some cases and working on fixes
  • Discussion on whether to have Sigma spend limit to limit damage in case of hacks. Unlike now which is a setting which miners can control, to lock it down on consensus layer. To look into a limit based on number of Zcoin spent instead of number of spends.
  • Discussion on whether to have two more denominations one between 1 and 10 and another between 10 and 100. Reduces anonymity but increases flexibility and reduces load. To use knapsack probem calculations to determine optimum denomination.
  • Minor display issues in client
  • Zcoin daemon needs to be updated to show sigma mint/spend amounts to enable easier parsing for Insight/explorer.
  • Refactoring work continues
  • Special thanks to Mintpond for setting up testnet mining pool.

HD Mints

  • HD Mints allow easier porting of Sigma mints without requirement to back up exact wallet.dat
  • Work complete undergoing review.
  • Changed hashing algorithm to match Bitcoin’s derivation
  • To look into BIP44 compatibility

Zerocoin

  • Shared Dmitry Khovratovich’s ideas on fixing Zerocoin to the working group
  • Tool to convert existing unspent Zerocoin mints to Sigma mints is complete and working on writing unit tests this week

Deterministic Masternodes and Core Upgrade

  • Deterministic masternode upgrade and core upgrade to 0.14 stalled temporarily because of work on Zerocoin mint conversion tool.
  • Probably another 2 weeks out after Zerocoin mint conversion tool done, then merge Sigma into it.
  • Aim deployment after Sigma release
  • Will hold off on 0.18 upgrade as Themis smart contract layer requires 0.14 as well

Exodus Adoption

  • Company wishes to develop Thai Baht stable token on Exodus token layer
  • Thai team to assist with easier GUI and API to enable easier usage of Exodus.

Lelantus

  • All cryptographic libraries finished and ready for review
  • Once Sigma deployment is complete, to divert resources for Lelantus
  • Recently mentioned by Dr Sarang Noether in his monthly Monero research report

GUI

  • Development stalled due to Sigma syncing issues
  • Code cleanup while waiting and to ease the way for light wallet support

MTP

  • New CPU miner released with now up to 9.2KH/s/thread using AVX2 instruction optimizations
  • To look deeper into proposal to reduce MTP proof sizes by using bulletproofs
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