Updated details [ZEC] ZCASH + Announcing Zcash Cloud Mining

  • ZCASH Wekly Update -  Upcoming events, Zcon0 & the Foundation & More

    May the 4th be with you, Zcash community! 

    Since last week saw the end of our first engineering sprint, we’re now in the middle of the second sprint so I figure it makes sense to try and talk more about community related updates on the off week. So going forward, I’ll alternate these weekly reports between engineering and community/communications. Next week will be the end of our second engineering sprint and I’ll therefore have a recap of the various engineering teams sprint work. Note that each release cycle contains 3 sprints and that we are still in heavy dev mode for both implementing Sapling consensus code for the next release so we can activate it on test net in the following weeks and also external preparations for Overwinter activation at block height 347500 .

    From the blog…

    If you haven’t yet seen it, we’re experimenting with a new program to streamline community feedback of services in the Zcash ecosystem. We’re calling this the Community Spotlight and our first project comes from Zcash Foundation grant program backed Guarda wallet . So check out that blog and if you’re interested in testing the user experience in Guarda, use the form linked from the blog to let us and Guarda know your thoughts! If you have suggestions for future Community Spotlights, let us know!

    In more recent news, we’re delighted to hear about support for Zcash in Circle Invest announced this week .

    Upcoming events

    We have a lot of events coming up that we’re thrilled to participate in and engage with the community at!

    This Sunday, we’re speaking at the Colorado Springs Blockchain & Crypto entrepreneurs meetup  and next week will be attending the Blockchain Summit Latam  so come say hello if you’ll be at either of those! Next week we’re also giving a remote presentation to the Blockchain Online Forum hosted by the Seoul Crypto Club.

    The following week is a big week for us! As part of our sponsorship of 100 student passes for Consensus , we’re kicking off the week in New York with a session to greet the students and pass out some swag. Once Consensus commences the next day, several of us will be on the ground to meet potential and existing third parties in the ecosystem, engage with Zcash users and developers and generally promote and educate folks on the upcoming network upgrades. Zooko will also be doing a fireside chat with Dr. Whitfield Diffie to round out the first day.

    In addition, we’ll be participating in the the New York Women in Blockchain meetup that week to talk about Zcash in Venezuela and then popping down to DC to present at the DC Blockchain Users Group. Come say hi if you’re around!

    On the other side of the US, we’re participating in Boulder Startup Week  where we’ll talk about opportunities in the blockchain industry.

    Next week we’re hosting a special presentation from Zcash advisor, Joseph Bonneau about Hostile blockchain takeovers  which is particularly relevant to the ongoing community discussions about ASIC resistance in Zcash.

    Zcon0 & the Foundation

    We’re starting to send out letters to applicants of Zcon0. If you haven’t fill out the form yet and are interested in joining us in Montreal this Summer, definitely consider applying to attend . This application process is mostly so we can consider financial aid needs and filter out people who are only engaging to promote unrelated projects, ICOs, etc.

    Also, don’t forget to check out the governance proposal for the Zcash Foundation  including their plan for a community governance panel which will vote on issues like board elections and ballot measures (i.e. should Zcash actively resist ASICs?).

    That’s all for this week! I’ll be back next week with summaries of each engineering team’s sprint work!

  • Zcash (ZEC) Release Wallet Version 1.1.1

    This release is an Overwinter-compatible version of the Zcash node software, with initial support for Sapling consensus rules and a Sapling testnet activation height set to block 252500.

    Overwinter network upgrade

    The first block of Overwinter will be block 347500, which is expected to be mined on the 25th of June 2018. Please upgrade to this release, or any release from v1.1.0 onwards, in order to follow the Overwinter network upgrade. See our previous blog post and the Overwinter Network Upgrade page for more information.

    Developers preparing for Sapling

    Sapling network upgrade

    The consensus code preparations for the Sapling network upgrade, as described in ZIP 243 and the Sapling spec are finished and included in this release. Sapling support in the wallet and RPC is ongoing, and is expected to land in master over the next few weeks.

    The Sapling MPC is currently working on producing the final Sapling parameters. In the meantime, Sapling will activate on testnet with dummy Sapling parameters at height 252500. This activation will be temporary, and the testnet will be rolled back by version 2.0.0 so that both mainnet and testnet will be using the same parameters. Users who want to continue testing Overwinter should continue to run version 1.1.0 on testnet, and then upgrade to 2.0.0 (which will be released after Overwinter activates).

    Sapling can also be activated at a specific height in regtest mode by setting the config options -nuparams=5ba81b19:HEIGHT -nuparams=76b809bb:HEIGHT. These config options will change when the testnet is rolled back for 2.0.0 (because the branch ID for Sapling will change, due to us following the safe upgrade conventions we introduced in Overwinter).

    Users running testnet or regtest nodes will need to run ./zcutil/fetch-params.sh --testnet (for users building from source) or zcash-fetch-params --testnet (for binary / Debian users).

    As a reminder, because the Sapling activation height is not yet specified for mainnet, version 1.1.1 will behave similarly as other pre-Sapling releases even after a future activation of Sapling on the network. Upgrading from 1.1.1 will be required in order to follow the Sapling network upgrade on mainnet.

    Sapling transaction format

    Once Sapling has activated, transactions must use the new v4 format (including coinbase transactions). All RPC methods that create new transactions (such as createrawtransaction and getblocktemplate) will create v4 transactions once the Sapling activation height has been reached.

    Other notable changes

    zcash-cli: arguments privacy

    The RPC command line client gained a new argument, -stdin to read extra arguments from standard input, one per line until EOF/Ctrl-D. For example:

    $ src/zcash-cli -stdin z_importkey
    ^D (Ctrl-D)

    It is recommended to use this for sensitive information such as private keys, as command-line arguments can usually be read from the process table by any user on the system.

    Asm representations of scriptSig signatures now contain SIGHASH type decodes

    The asm property of each scriptSig now contains the decoded signature hash type for each signature that provides a valid defined hash type.

    The following items contain assembly representations of scriptSig signatures and are affected by this change:

    • RPC getrawtransaction
    • RPC decoderawtransaction
    • REST /rest/tx/ (JSON format)
    • REST /rest/block/ (JSON format when including extended tx details)
    • zcash-tx -json

    For example, the scriptSig.asm property of a transaction input that previously showed an assembly representation of:


    now shows as:


    Note that the output of the RPC decodescript did not change because it is configured specifically to process scriptPubKey and not scriptSig scripts.

    Summary of the changes included in this release

    1. We set the Sapling testnet activation height to block 252500. (#3305#3212)
    2. We implemented Sapling consensus rules. (#3207#3220#3232#3255#3275#3170#3191#3197#3169#3185)
    3. We implemented ZIP 243 for Sapling signature hashing. (#3233#3251)
    4. We backported transparent address refactors, and are in the process of adding support for Sapling keys, addresses and notes. (#3206#3234#3123#3228#3202#3242)
    5. We extended a mempool eviction RPC test to cover Sapling activation. (#3074#3179)
    6. We updated the Payment API documentation. (#3264#3160#3181#3183)
    7. We updated the build process to use Rust 1.26 stable. (#3271#2784#3153#3227)
    8. We extended Sprout tests to other epochs. (#3157#3086#3180#3193#28131.1.1 milestone.



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