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Jonathan "Duke" Leto 5 years ago
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      hush-v3.pdf
  2. 83
      hush-v3.tex

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@ -82,7 +82,7 @@
\newlist{formulae}{itemize}{3}
\setlist[formulae]{itemsep=0.2ex,topsep=0ex,leftmargin=1.5em,label=,after=\vspace{1.5ex}}
\newcommand{\docversion}{Pre-Release Version}
\newcommand{\docversion}{Whitepaper Version 1.0}
\newcommand{\termbf}[1]{\textbf{#1}\xspace}
\newcommand{\Hushlist}{\termbf{HushList}}
\newcommand{\HushList}{\termbf{HushList}}
@ -432,7 +432,7 @@ zkSNARKs, HushList, cryptoconditions, smart contracts, 51\% attack, double spend
\title{\doctitle \\
\Large \docversion}
\author{
\Large \leadauthor\hairspace\thanks{\;duke@leto.net https://myhush.org}
\Large \leadauthor\hairspace\thanks{\;duke@leto.net , duke.leto.net, @dukeleto}
}
\date{\today}
\maketitle
@ -446,7 +446,8 @@ zkSNARKs, HushList, cryptoconditions, smart contracts, 51\% attack, double spend
originally called "Zdash" and mined a genesis block on Nov 17, 2016. The
latest version of \Hush migrates to a new codebase based on Komodo and Zcash
2.0.x with a new genesis block mined on April 14th 2019, while keeping the
emission schedule as close as possible to the original intentions.
emission schedule as close as possible to the original intentions. Latest
details can be found at https://myhush.org .
\begin{quote}
A beginning is the time for taking the most delicate care that the balances are correct.
@ -474,7 +475,7 @@ A beginning is the time for taking the most delicate care that the balances are
\begin{itemize}
\item 21M total supply
\item Block reward = 12.5 HUSH
\item Block reward = 12.5 \HUSH
\item Block time = 150 seconds
\item Halving interval = every 210,000 blocks
\item Delayed-Proof-Of-Work
@ -487,7 +488,7 @@ A beginning is the time for taking the most delicate care that the balances are
\item New Genesis Block
\item Sprout Disabled
\item First Sprout-Free Chain, with Only Sapling Shielded Transactions
\item Replace ZEC with KMD as upstream
\item Replace Zcash (\ZEC) with Komodo (\KMD) as upstream
\item New main Github repo
\item Addition of 10\% Founders Reward
\item Address prefix change (t1,t3 becomes R,b)
@ -506,13 +507,13 @@ A beginning is the time for taking the most delicate care that the balances are
\nsection{New Genesis Block}
The new HUSH v3 mainnet genesis block has block hash:
The new \HUSH v3 mainnet genesis block has block hash:
06c3269d065d19960ba2aac92daad182f24961043b8e279a64a3c0298d4bf7ed
and occured at unix Epoch time 1555263294.
Additional useful metadata that can be used to verify you have the correct HUSH
Additional useful metadata that can be used to verify you have the correct \HUSH
genesis block:
"nextblockhash": "0a3bcdd57276c1a07aa657992967fb0c64cd12d489bde85223058381cb58d95d"
@ -523,16 +524,14 @@ genesis block:
"finalsaplingroot": "3e49b5f954aa9d3545bc6c37744661eea48d7c34e3000d82b7f0010c30f4c2fb",
"hash": "06c3269d065d19960ba2aac92daad182f24961043b8e279a64a3c0298d4bf7ed",
This block can be viewed in a more user-friendly manner at:
https://explorer.myhush.org/block/06c3269d065d19960ba2aac92daad182f24961043b8e279a64a3c0298d4bf7ed
\nsection{First Sprout-Free Sapling Blockchain}
HUSH is proud to be the very first blockchain to enforce only Sapling
transaction from the very beginning! HUSH enables Sapling at Block 1, which
\HUSH is proud to be the very first blockchain to enforce only Sapling
transaction from the very beginning! \HUSH enables Sapling at Block 1, which
means no Sprout UTXOs will ever exist on our new blockchain. This removes any
future risk of Sprout bugs/CVEs and drastically reduces the maintenance cost
going forward, as Sprout code and Sapling code are different codepaths and so
@ -544,12 +543,12 @@ No other blockchain has started as a pure Sapling chain, all other existing
Most closely aligned to Hush is our sister coin Pirate (ARRR), which was the
very first coin to disable normal transparent transactions (only coinbase and
notarizations) and was one of the first coins to transition away from Sprout to
Sapling. The decision for HUSH to disable support for old Sprout coins, after a
Sapling. The decision for \HUSH to disable support for old Sprout coins, after a
certain block height, was inspired by Pirate: https://pirate.black
\nsection{10\% Founders Reward}
HUSHv3 adds a 10\% Founders Reward, in perpetuity, until block rewards end.
\HUSH v3 adds a 10\% Founders Reward, in perpetuity, until block rewards end.
This is approximately 5.5 million blocks or about 30 years.
The Founders Reward is paid out every block in vout[1] to a single address
@ -561,7 +560,7 @@ with scriptPubKey
76a9145eb10cf64f2bab1b457f1f25e658526155928fac88ac
Initially the Founders Reward is 1.25 HUSH, starting at Block 129 until the first
Initially the Founders Reward is 1.25 \HUSH, starting at Block 129 until the first
halving on the new chain at Block 340000.
In order to help transition, there will be a period of 128 blocks of zero block
@ -574,20 +573,20 @@ estimate.
\nsection{New Upstream: KMD}
HUSH is no longer directly a source code fork of Zcash (ZEC), it is now a fork
of \cite{Komodo} (KMD). Since KMD itself is a fork of ZEC, this means we gain an
\HUSH is no longer directly a source code fork of Zcash (\ZEC), it is now a fork
of \cite{Komodo} (\KMD). Since \KMD itself is a fork of \ZEC, this means we gain an
immense amount of code and features, and all the development velocity of jl777.
As an example, during the development of HUSHv3, over the course of a few weeks,
As an example, during the development of \HUSH v3, over the course of a few weeks,
about 20,000 lines of code was changed in upstream Komodo repo, adding many
features and fixing various bugs.
We expect to see the developement velocity of the HUSH community greatly
We expect to see the developement velocity of the \HUSH community greatly
increase, since we will now essentially have jl777 constantly doing low-level
blockchain internals coding, which frees up other developer resources to work
on wallets, explorers, HushList protocol and applications which sit on top
of the RPC interface.
HUSHv3 is a source code fork of the jl777/komodo git repository and lives at
\HUSH v3 is a source code fork of the jl777/komodo git repository and lives at
https://github.com/MyHush/hush3
@ -613,7 +612,7 @@ others as time goes on:
\end{itemize}
These features will allow for an entire ecosystem of decentralized applications
(dApps) to be built on top of HUSH, which integrate with HushList protocol as
(dApps) to be built on top of \HUSH, which integrate with HushList protocol as
well as cross-chain integrations with other Komodo asset chains that have
cryptoconditions enabled.
@ -632,23 +631,23 @@ our new chain (Hush v3) by ceasing block rewards when total supply hits 21M
coins, as intended.
As a reminder, NONE of the current Hush team received any the original 0.76\%
(160,000 HUSH) pre-mine. All of the original Hush developers who received the
(160,000 \HUSH) pre-mine. All of the original Hush developers who received the
reward have long since left the project.
The current Hush chain (version 2) will attain a supply of 21,000,000 coins at
Block 5922239 which will have a Block Reward of 0.09765625 HUSH. This happens
Block 5922239 which will have a Block Reward of 0.09765625 \HUSH. This happens
between the 7th and 8th halvings.
But because the original devs of Hush added a pre-mine of 160,000 HUSH in blocks
But because the original devs of Hush added a pre-mine of 160,000 \HUSH in blocks
1 through 4, the current Hush supply curve will continue past the 21M supply
mark until Block 26039999 when supply is 21159937.4895 HUSH and the last block
mark until Block 26039999 when supply is 21159937.4895 \HUSH and the last block
reward of 1 satoshi is awarded just before the 31st halving.
The core issue is that blocks 1 through 4 had a block reward of 40,000 each
instead of 12.5 each in the GetBlockSubsidy() function defined in main.cpp, but
the overall emission schedule was not modified to take this into account.
This mistake would eventually lead to an extra 159,937.4895 HUSH of total supply
This mistake would eventually lead to an extra 159,937.4895 \HUSH of total supply
beyond the intended totaly supply of 21M, which would happen after about 30
years, between the 7th and 8th halvings.
@ -682,12 +681,12 @@ which can install and sync a full node in just a few minutes.
- Fremen saying of ill will against an adversary
\end{quote}
HUSH will continue to have Delayed Proof-of-Work as protection against 51\%
\HUSH will continue to have Delayed Proof-of-Work as protection against 51\%
attacks and double spend attack prevention. No other technology is proven
in production like \cite{DPoW}.
The first DPoW transaction occured at Apr 14, 2019 10:38:10 PM Eastern Time
on the new HUSH mainnet :
on the new \HUSH mainnet :
https://explorer.myhush.org/tx/e73105092bbf01694af250f8ef89aa38d955856a5a3496e3336eaca59492b29f
@ -696,16 +695,16 @@ large amount of hashrate was rented at NiceHash, and a 51\% attack was
attempted, which would re-organized a notarized block. The attack repeatedly
failed and wasted a large amount of BTC of the simulated attacker.
HUSHv3 will be migrating to the core DPoW implementation of Komodo itself,
\HUSH v3 will be migrating to the core DPoW implementation of Komodo itself,
instead of relying on the implementation that was ported from Komodo to the
Hush v2 codebase. This further increases HUSH development velocity and reduces
Hush v2 codebase. This further increases \HUSH development velocity and reduces
our maintenance burden to merge upstream code.
\nsection{Cryptopia Attack}
Delayed-Proof-of-Work had been implemented in Hush in early 2018 but took many
months to finish testing and be pushed to mainnet. During this time, an
enterprising attacker probably saw that their window to attack HUSH was closing.
enterprising attacker probably saw that their window to attack \HUSH was closing.
This attacker performed a series of 51\% and double spend attacks against
Cryptopia, between August 28th and September 21st 2018 It was designed to use
@ -730,7 +729,7 @@ was orphaned and replaced by the 45 block subchain:
\end{quote}
Note that the above block hashes must be looked up on a legacy HUSH block
Note that the above block hashes must be looked up on a legacy \HUSH block
explorer such as :
https://explorer.hush.zelcore.io
@ -741,7 +740,7 @@ exist as an orphaned blocks on nodes which originally saw that invalidated chain
Via blockchain analysis and detailed transaction logs from Cryptopia, who gave
us details about which addresses the attacker was using, it was determined that
the following addresses are owned by the Cryptopia Double Spend Attacker, with
old HUSH v2 addresses on the left and new HUSH v3 addresses on the right.
old \HUSH v2 addresses on the left and new \HUSH v3 addresses on the right.
\begin{quote}
@ -751,14 +750,14 @@ t1KttMaacGw17oFitV448TGfwM2yovm4g6Q = RBJURm3kuS26Gd3C1oE8QyuDreFKpkNT2Z
\end{quote}
The first address owns 651000 HUSH and the second owns 29279.8 HUSH on the
legacy HUSH v2 chain which was not dispersed to the equivalent addresses on the
new HUSH v3 mainnet. These funds currently remain in the HUSH Founders Reward
The first address owns 651000 \HUSH and the second owns 29279.8 \HUSH on the
legacy \HUSH v2 chain which was not dispersed to the equivalent addresses on the
new \HUSH v3 mainnet. These funds currently remain in the \HUSH Founders Reward
wallet and will be used to reimburse all who were stolen from at Cryptopia,
which will enable HUSH trading to resume. Any remaining funds will be used for
which will enable \HUSH trading to resume. Any remaining funds will be used for
additional exchange listings.
\nsection{Immutability of HUSH v2 + v3}
\nsection{Immutability of \HUSH v2 + v3}
Please note that the immutability of the legacy Hush mainnet or new Hush v3
mainnet was never compromised. The \cite{Bitcoin} Protocol was observed strictly and
@ -782,8 +781,8 @@ get to decide which chain goes forward.
\nsection{Sprout Inflation Bug Playground}
Let it be known that HUSH v2 mainnet is considered a Sprout Inflation bug
playground, and there is a bounty of 500 HUSH for a script which makes it
Let it be known that \HUSH v2 mainnet is considered a Sprout Inflation bug
playground, and there is a bounty of 500 \HUSH for a script which makes it
trivial to exploit the Sprout inflation bug and generate arbitrary amounts
of funds inside of a Sprout zaddr.
@ -795,13 +794,13 @@ https://github.com/MyHush/hush3/issues/7
\nsection{Dispersing Funds To The New Mainnet: Swapping Airdrop}
This process is sometimes called an "airdrop" because the technical process of
sending funds to addresses is the same, but HUSH v3 is technically a "coin
sending funds to addresses is the same, but \HUSH v3 is technically a "coin
swap", since we do not support our legacy chain.
A total of 3127 transactions with "sendmany" were made to complete sending funds
to 31,267 unique addresses which contained funds on the Hush v2 blockchain as
of the snapshot block of 500,000. The average address had about 200 HUSH while
the median address had 1 HUSH.
of the snapshot block of 500,000. The average address had about 200 \HUSH while
the median address had 1 \HUSH.
This data was extracted via the "getsnapshot" RPC which I helped write for
Komodo and ported to Hush v2. Additionally I ported the -stopat CLI param

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