Shadow Cash {SDC} Updatd Details:

  • The Shadow Project is an open source project aiming to be the core of privacy, where people will build decentralized applications.


    Block time: 60 s

    Difficulty re-target: every block

    Nominal stake interest: 2% (PoSv3 – static inflation annually)

    Min. stake age: 8 hours (no max age)

    P2P port: 51737

    RPC port: 51736


    Min. Fee: 0.0001 SDC

    Confirmations: 10

    Maturity: 500


    Virtual currencies are quickly becoming very popular due to their superiority over traditional methods of exchange. Prior to Bitcoin, the largest problem for these virtual currencies was the prevention of double spending attacks. In short, double spending is the malicious act of executing multiple transactions using the same units of currency (the equivalent of counterfeiting paper money). Bitcoin was able to solve this major issue by integrating a public ledger of all previous transactions known as a block chain. Each member of Bitcoin’s network has the ability to analyze every transaction ever executed, allowing them to see if coins had been previously spent before accepting any new transactions. Unfortunately, as one may be able to easily deduce, a block chain such as Bitcoin’s does not allow for native anonymity or privacy. The public nature of a block chain allows anyone to observe the entire transaction history and holdings of every participant.

    Mission Statement

    On December 10, 1948, the General Assembly of the United Nations adopted and proclaimed the Universal Declaration of Human Rights. Article 12 states: “No one shall be subjected to arbitrary interference with his privacy, family, home or correspondence, nor to attacks upon his honour and reputation. Everyone has the right to the protection of the law against such interference or attacks." Nearly 67 years later, we believe this declaration to be more important than ever. To help protect this most basic right to privacy, The Shadow Project is building an encrypted, digital ecosystem. Cryptographic innovations will catalyze the evolution of communication, commerce, and currency. Shadow’s mission is to remain at the forefront of this evolution with it’s decentralized privacy platform, made available to all operating systems


    Download Wallet

    Windows X64:

    Windows X32:


    MacOS X

    Pro Tip — Download the blockchain separately, to get in sync in minutes!

    Block Explorers – Official Explorer – SDC at CryptoID – Insight Block Explorer


    For guides and technical documentation please refer to






    Trade Satoshi

    You can also pay with ShadowCash (SDC) anywhere Bitcoin (BTC) is accepted instantly with:




    Alpha private testing

    Invites can be requested using the following link: ALPHA

    Beta public testing

    More info coming soon.


    Video coming soon.


    See — ShadowProject Roadmaps


    Follow recent updates on Shadow Blog

    See latest commits on


    Shadow is an Open Source project which is created almost entirely by volunteers. There are lots of ways you can get involved and help the project grow and improve. Here are some ways for you to get started!

    Know how to code? Help us!

    The Shadow project is hosted over on GitHub. This is where our developers work hard on the next version(s) of the software. To get involved with developing Shadow, check out our detailed contributing guidelines. We credit all contributors to the Shadow project in every major and minor release.

    We hold public development meetings and chat in our Slack team (get an invite and join our chat). We also maintain a public roadmap and dev blog to give you an idea of what's being worked on right now, and what's coming next.

    We're currently looking for lead contributors in the following roles:



    Do you know someone who might be interested? Do not hesitate and contact us directly.

    Found a problem? Let us know!

    If you think you've found a bug or a problem with Shadow, please let us know! First, search our issue tracker to search to see if someone has already reported the problem. If they haven't, click here to open a new issue, and fill out the template with as much information as possible. The more you can tell us about the problem and how it occurred, the more likely we are to fix it. Please check out our bug and bounty program for our guidelines and more details.

    Please do not report security vulnerabilities publicly.

    We are a non-profit and Open Source software project and are trying to build a private economy. We appreciate all the help we can get in making this a reality. Both addresses are managed by Rynomster (lead developer). If applicable, please specify whether you want to remain anonymous. Many thanks to all our sponsors!

    Official BTC donation address: 1GiosBkSpN8RS9pm1kgZU8AZUBEnLKYFem

    Official SDC donation address: SdcDevWEbq3CZgZc8UNbST1TaYLA5vLZTS


    According to Linus’ Law, “given enough eyeballs, all bugs are shallow”. That’s one of the reasons why Shadow’s source code is publicly available; but merely making the source code available doesn’t accomplish anything if people don’t read it!

    For this reason, Shadow has a series of bug bounties. Similar to the bounties offered by Mozilla and Google, Shadow bug bounties provide an opportunity for people who find bugs to be compensated. Unlike those programs, however, Shadow’s bounties are not limited to security vulnerabilities.

    Depending on the type of bug and when it is reported, different bounties will be awarded. Bounties are paid out in SDC, at the 3-day average of each to a fixed US Dollar value.

    Things that do not qualify under the bug bounty

    • Bugs found on third-party/community sites, software or services, which is not due to an improper configuration issue specific to us. Please submit any potential issues to the maintainers of that site or providers of that service.
    • Vulnerabilities which are too broad or not documented properly (i.e. do not include a specific example relevant to a Shadow-controlled site or application).
    • Bugs or issues with a third-party site, software, or service that we use, which is not due to an improper configuration issue specific to us. Please submit any potential issues to the maintainers of that site or providers of that service.
    • Bugs and errors found in software/code that is still undergoing alpha or beta testing.
    • Usability issues
    • Anything requiring social engineering
    • DOS/DDOS attacks
    • Missing HSTS (HttpOnly flags), Secure flag, Browser Cache vulnerabilities
    • CSRF that doesn’t affect the victim
    • Referrer leakage to pages an attacker cannot control.
    • The presence of unnecessary files, e.g. for backups, when these files do not expose any sensitive information.
    • Anything that is the result of an automated Nessus/PCI scans (too general)
    • DNS issues (e.g. lack of an SPF record)
    • SSL certificate issues
    • Bugs that have received mainstream tech media or community attention before the date of your disclosure.


    Depending on the type of bug and when it is reported, different bounties will be awarded. Bounties are paid out in SDC, at the 3-day average of each to a fixed US Dollar value.

    Please do not report security vulnerabilities publicly.




    Deanonymize ShadowChat or ShadowSend (proof that a protocol is not anonymous)


    A flaw in the protocol that allows for theft or loss of funds


    A bug in the reference client that leads to consensus issues


    A bug which causes data corruption or loss


    A bug which causes the application to crash

    Note — Bounties will be paid out for bugs found in the master branch of the official GitHub repositories (en)


  • Protect the fortress - Dev Update [2 December]


    Welcome to our December update. Since our last post we have covered a lot of ground, hence the lack of communication. We have made several improvements to our platform and have been planning some major changes to the project as a whole. Over the last few months, we have seen greater support and excitement surrounding the project than we could of imagined. As a team we have been discussing some pivotal changes we would like to make to ensure this project gets the exposure and support it needs to be the best decentralized marketplace & privacy platform. We have come a long way from the beginning, but we still have a long way to go to get it into the hands of people all around the world.While we are currently in the planning phase of these changes, there are a few things we know need to take immediate priority. One of these priorities is building out and structuring the team in a more efficient and official manner. This should drastically help each developer, and the team as a whole, complete tasks, fix bugs, and push updates much easier. Bugs and issues are now managed on GitHub itself, anyone can participate.

    There has been a lot of internal discussion about the future ahead and how to get there. Several ideas are floating around and we're all putting our brains together to find the optimal situations. A few members of the team have been busy this month meeting with outside advisors on the best steps forward, and we will divulge more information on this in the near future. As a team, we all agree that in order to build a world-class platform we need to recruit top talent and bring on expert advisors. So the process starts now.

    With that said, we are happy to announce Tecnovert has recently rejoined the team in order to inspect the codebase and explore the possibilities and estimate timeframes for several new features. For those not familiar, Tecnovert helped create Shadow when it first launched and knows his way through the code very well. There is no developer better fit for the task at hand. We have a rough estimate on the necessary budget to sustain the development and are in the midst of planning out a sustainable method for funding. We will touch more on this in the near future as wel


    We have recently made our new graphical user interface fully open source. This allows other developers with knowledge of HTML, CSS and JavaScript to help a hand with issues and improvements.We have also opened up the tracking of issues to the public, improve contributors guidelines and quality assurance.

    All users who make use of the chat have to upgrade to Old clients (< will not be able to receive messages sent from and upward. A security improvement was made to the message verification scheme; namely the IV is now also included in the HMAC hash such that it can not be tampered with in transit.sp

    Translations have arrived! There is now translation support for nearly all phrases and for a majority of all the supported languages. A few phrases are still English by default but those will be changed as they are found.Note: You can change the language in the options menu. You can join our translation effort on Transifex!

    As some of you may know we have recently launched and bootstrapped our own wikipedia. This has been done by allien and he has created the only well-organized wikipedia in the entire universe. Anyone can easily edit and create pages to share their knowledge. It will remain in active development and will most likely become the main hub for our documentation.

    Click here to visit our wiki

    Support our Wiki with SDC!


    A new checkbox "enable messaging" has been added to the wallet unlock screen, now you can unlock your wallet for staking and message at the same time. Previously you had to unlock the wallet fully before being able to send or receive a message.

    Encrypted wallets are now able to stake without relocking from the command line. This is especially useful on raspberry pi's and other staking devices where the terminal is the preferred way of operating.

    ./shadowcoind walletpassphrase yoursuperlongpasswordhere 0 true

    When viewing a message sent in a chat message you will now see this image first, preventing the leakage of the IP address to third party servers. Additional work is planned to route images loaded in the GUI over the proxy for enhanced privacy and security.

    Improved estimate anon fee (work in progress)

    Some code clean up, remove json from messaging

    bridge datadir parameters

    various bug fixes


    We now have a docker image with Tor support, created by community member 6ea86b96! It's pretty neat and does the tedious process of setting up the Tor config for you, with additional security features to protect against known fingerprinting attacks and network analysis attacks against static onion addresses. When restarting the docker, a fresh new onion address is generated as a security measure.Running UMBRA over Tor hides the IP addresses from the network, and offers greater privacy. We advice all users to set this up, join IRC or Slack if you want to do this, we will gladly help. A tutorial documenting this will be available soon. Download the docker files here!

  • Shadowcash New Exchange:

     For more Info about CryptXC

  • Particl: A New Platform

    Dear Umbra users and Shadow Project community,

    I’m not sure many of you know this but ShadowCash didn’t start out with the mission of creating an entire suite of privacy tools, highlighted by a decentralized market. An article came out in 2015 that gained a huge amount of traction and we all looked at each other and thought, “Wow! This just got real!”

    Our journey together has been long, but well worth it. Today I’m excited to inform you we now have a working prototype of the much awaited marketplace, and it will be introduced into a brand new platform, Particl.

    While the marketplace functions as an internal component to Umbra, the entire platform has been a successful community driven prototype validating the need for a truly decentralized privacy platform. This marks the final piece of the puzzle and highlights a dizzying breadth of donated work and innovation over the past two and a half years. Umbra’s built-in end-to-end encrypted chat, public and privacy-focused digital currency and decentralized marketplace work in unison to allow users to shop, communicate and transact anywhere in the world while maintaining their privacy.

    With the prototype for Umbra’s breakthrough technology in hand, we will now implement this technology into Particl, a fully scalable, decentralized and privacy-centric marketplace. The launch of Particl marks the end of the Shadow Project and the Umbra platform, but the development of Particl is a move toward a more technologically sound marketplace that simultaneously protects privacy while also meeting regulatory standards that will ensure its global longevity.

    What is happening to the ShadowProject and your ShadowCash?

    Out of gratitude and respect for the great ShadowCash community, I would like to exclusively offer the ShadowCash (SDC) holders the opportunity to participate in the commencement of the Particl project. SDC is the only ticket to be part of the Particl network prior to its launch, so if you hold SDC — great, do not get rid of it. If you do not yet hold SDC, and want to support Particl, you will need to obtain SDC to do so. It is our desire and belief that our community will also want to see the greater vision carried out, and will join us in total support. To understand the full scope of our plans and intentions with the Particl project, and how ShadowCash holders can exclusively join us in the upcoming launch, please visit

    What is Particl?

    Particl will usher in a fundamental shift in how people across the world view Privacy marketplaces. Here are a few reasons why Particl is a step toward a future where you will have the freedom to communicate and engage in commerce, with privacy.

    Full-time staff: The Particl project will have continuous, professional development through more dedicated funding (via the network and supporters), will have access to key resources and will ultimately be able to expand its customer segments and hopefully have a more global reach. A new team of key partners, advisors, and contributors will help propel this decentralized privacy platform far beyond where the Shadow Project alone could have gone. We will continue to work in an open source framework and look forward to continuing to collaborate with the open-source community of developers.

    Crypto-agnosticism: As we have mentioned on several occasions, we are building a platform and not a feature. Particl will be extending its platform to other coins in order to foster inclusion within the entire cryptocurrency community. The Particl marketplace will provide a seamless interface for users to purchase items using other coins in such a way that users would not be aware they have used Particl to transact, while at the same time encourage sellers to keep Particl coins thru the Proof-of-Stake rewards. By allowing the marketplace to accept other digital currencies, the platform can gain greater momentum and grow more quickly by adopting the network effects of other cryptocurrencies. Particl will adapt a native public / private 2-token currency and the Particl project team is in discussions regarding partnerships with exchange platforms to allow the use of many other cryptocurrencies onto the platform.

    Hardened code-base: The Umbra community of contributors, supporters, testers, and users have validated the need for a privacy platform built on a rock-solid blockchain codebase. Particl will be built on a new blockchain, which will have a series of major improvements, including being based on the latest Bitcoin Core version, and additional features technical features for greater anonymity.

    Self-governance model: As the majority of users of the Umbra marketplace and of other Privacy Coins will vehemently attest to, the need for privacy is not a signal that one is involved in illegal activities. Privacy, the state of being free from surveillance or observation, is, at its core, a human right. Particl is re-conceptualizing these negative associations with a breakthrough self-governance function that will essentially give members of the ecosystem the power to downvote bad actors via consensus. We have developed Particl with the guidance of a team of business consultants and the internationally reputed law firm, ensuring that the project will protect user freedom and be regulatory sound. This breakthrough model maintains the integrity of the decentralized ecosystem and discourages bad actors in the network. What’s next?

    I’m thrilled to say that we will have one of the easiest transitions to a new startup project because the entire development team from the Shadow Project (and additional new members!) will be joining me to work on Particl, effective immediately.

    Many innovations to the original bitcoin codebase have been developed by this team and adopted by many other projects in this space. The list of firsts is long but highlighted by an upgraded end-to-end encrypted chat, implementing BIPs for a more secure blockchain and the novel public / private token system that leverages non-interactive zero-knowledge proofs (NIKZPs), stealth addresses and ring signatures. Having received the full commitment from the team and having tasked them with building a completely decentralized suite of currency, trade and encrypted chat tools is beyond amazing!

    ShadowCash has a $30MM market cap, which is a testament not only to the success of the Umbra platform but more importantly, the yet-to-be-realized potential of the tools we have already built. Our approach, unlike aspects the ShadowProject, is intended to scale for the future. Myself and much of the team will now be working full-time in a financially-backed, professionally structured manner to create a consumer-grade, decentralized privacy platform that we hope will be useful to users globally.

    There has never been a greater experience than seeing the passion that everyone has displayed throughout the last two and a half years! I am excited to begin this new venture and follow through on the grand vision we, as a community, have all shared and supported. Please join me as we set out to make a positive impact in the lives of millions around the world and thank you always for your continued support.

    Sincerely yours,  Ryno Mathee (Rynomster)  Lead Project Developer

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