A privacy-preserving blockchain on Substrate

Last update: Dec 26, 2022

Overview

Zerochain

Zerochain is a generic privacy-protecting layer on top of Substrate. It provides some useful substrate modules and toolkit for protecting user's privacy and sensitive data stored on chain. It is designed to get efficient zero-knowledge proving, reduce the on-chain storage cost and bring the flexibility for developing applications.

Have a look at Zerochain Book for usage and more information about using Zerochain.

Status

WARNING: Zerochain is alpha quality software, improvements and fixes are made frequently.

For now, only supported for the PoC of confidential payment inspired by Zether paper.

Balance for each account is encrypted

Transfer amount is encrypted

More features will be added... 💪 💪

Initial Setup

curl https://sh.rustup.rs -sSf | sh

rustup update stable
rustup update nightly
rustup target add wasm32-unknown-unknown --toolchain nightly
cargo +nightly install --git https://github.com/alexcrichton/wasm-gc

You will also need to install the following packages:

Mac:

brew install cmake pkg-config openssl git llvm

Linux:

sudo apt install cmake pkg-config libssl-dev git clang libclang-dev

Building

git clone [email protected]:LayerXcom/zero-chain.git
cd zero-chain
./build.sh
cargo build --release

Usage and Tutorial

Documented in Zerochain Book.

Related Repositories

polkadot.rs: JSON-RPC Client for Substrate API
ZFace (in same repo currently): An interface for interacting with Zerochain
librustzcash for zerochain: zcash's toolchains for Zerochain

Documentations

References

Substrate repo
Substrate Developer Hub
Zcash Protocol Specification
Zether: Towards Privacy in a Smart Contract World
Sonic: Zero-Knowledge SNARKs from Linear-Size Universal and Updatable Structured Reference Strings

Contributing

Feel free to submit your own issues and PRs
For further discussions and questions talk to us on Gitter

Maintainers

Osuke

Comments

Compiled file in repository
Hello~first in project. Nice to meet you. When project builded, seems compiled file is indicated as changed file in git repository.

modified: runtime/wasm/target/wasm32-unknown-unknown/release/zerochain_runtime_wasm.compact.wasm

Would this needed to be removed?
opened by kination 5
[WIP]Feature/fee

I tried to fix circuit_transfer.rs for fee feature, but my code failed to pass the test test_circuit_transfer() at assert!(cs.is_satisfied()); (line 473) .

I want the circuit to pass a zk-proof calculated for the balance for which the fee and transfer amount have been collected.

I intend to implement fee in the same way as value, but something seems to be wrong. Please look at the code for advice. Thank you.

ref:

もう直接、クライアントでEnc(fee)作って、remaining_balance = balance - amont - feeでzkして、Enc(fee), Txに乗っけて、オンチェーンでwithdrawするっていう方向性で開発いける？

opened by zakimal 4

error[E0432]: unresolved import `syn::token::CustomKeyword`

When I ran cargo install --force --path ./ to build, I ran into the following error:

error[E0432]: unresolved import `syn::token::CustomKeyword`
  --> ~/.cargo/git/checkouts/substrate-69260aa4cd850e18/2cdae73/srml/support/procedural/tools/src/syn_ext.rs:26:5
   |
26 | use syn::token::CustomKeyword;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ no `CustomKeyword` in `token`

error: aborting due to previous error

I follow the instructions from https://layerxcom.github.io/zerochain-book/ch01-01-installation.html. Can anyone help take a look?

opened by tlkahn 3

Can't debug send.

I created the wallet. It showed up the error when I executed the ./target/release/zface debug send.

➜  zero-chain git:(master) ✗ ./target/release/zface wallet list
* alice: 5EDB7hPS8JibuftAxeb5r4UvwFmk8d5f8wwLkNpnGeTxwH2c
➜  zero-chain git:(master) ✗ ./target/release/zface debug send -t 5EDB7hPS8JibuftAxeb5r4UvwFmk8d5f8wwLkNpnGeTxwH2c -a 100
Preparing paramters...
ERROR 2019-12-23T17:22:09Z: ws::handler: WS Error <Io(Os { code: 32, kind: BrokenPipe, message: "Broken pipe" })>
thread 'main' panicked at 'must not be empty: RecvError', src/libcore/result.rs:1188:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

opened by ashWhiteHat 2

Make correct sig hash for the compatibility with substrate

Need to be compatible with the signed data field between signing and verifying.

In unchecked_mortal_compact_extrinsic, the signature verification is implemented here. https://github.com/paritytech/substrate/blob/1997487ec082f436e4c3279402d4528d67c861be/core/sr-primitives/src/generic/unchecked_mortal_compact_extrinsic.rs#L85-L96

In oo7, the signing scheme is implemented here. https://github.com/paritytech/oo7/blob/79856e56658ad2b71115af5f682ac5d71a4f9ab3/packages/oo7-substrate/src/transact.js#L27-L42

opened by osuketh 2
Bump smallvec from 0.6.10 to 0.6.13
Bumps smallvec from 0.6.10 to 0.6.13.

Release notes

Sourced from smallvec's releases.

v0.6.13

Use the maybe-unit crate in place of soon-to-be-deprecated std::mem::uninitialized (#180). When built with Rust 1.36 or later, this fixes a source of undefined behavior. It also fixes deprecation warnings in Rust 1.39 and later, and test failures when run in MIRI. In Rust 1.35 and earlier it provides some safety improvements but does not completely eliminate undefined behavior. (However, we are not aware of any cases where the undefined behavior causes bugs in practice in those toolchains.)

v0.6.12

Move code using default fn into its own module (#161).

v0.6.11

The unstable alloc feature is no longer needed. This crate can now build with the std feature disabled on stable Rust 1.36 or later (#159).

Commits

7852204 Merge pull request #180 from mbrubeck/maybe_uninit

58d5416 Add a test for #139.

26ea2ca Run miri in CI

e64afc8 Use MaybeUninit for storage of inline items.

87f156b Version 0.6.12

e60df76 Version 0.6.11

3ee6d1e Auto merge of #161 - Centril:master, r=emilio

92122e2 Move use of 'default fn' to its own module.

c83bb71 Auto merge of #159 - CryZe:no-std, r=emilio

0e73d06 alloc is now stable

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dependencies
opened by dependabot[bot] 1
Removed some warnings

■First commit Just remove the unnecessary semicolon.

■Second commit The into_iter() return the reference currently but this function will stop returning reference because of upcoming breaking change following issue so it won't be able to use *. Replacing with iter(), it keeps returning reference. https://github.com/rust-lang/rust/issues/66145

■Third commit We can use ? operator instead of try!. The RFC about this is following. https://rust-lang.github.io/rfcs/1859-try-trait.html#desugaring-and-the-try-trait

■Fourth commit The alloc crate is stable since Version 1.36.0 (2019-07-04) release so we don't have to require the attribute.

opened by ashWhiteHat 1

Dependency problem

I'm getting a dependency problem when I run

cargo install --force --path zface

494 |           let mini_key: MiniSecretKey = mini_secret_from_entropy(entropy, password.unwrap_or(""))
    |  _______________________________________^
495 | |             .expect("32 bytes can always build a key; qed");
    | |___________________________________________________________^ expected struct `schnorrkel::keys::MiniSecretKey`, found a different struct `schnorrkel::keys::MiniSecretKey`
    |
    = note: expected type `schnorrkel::keys::MiniSecretKey` (struct `schnorrkel::keys::MiniSecretKey`)
               found type `schnorrkel::keys::MiniSecretKey` (struct `schnorrkel::keys::MiniSecretKey`)
note: Perhaps two different versions of crate `schnorrkel` are being used?
   --> /home/ericfindlay/.cargo/git/checkouts/substrate-69260aa4cd850e18/f42927b/core/primitives/src/sr25519.rs:494:33

The schnorrkel dependency in substrate/core/primitives was changed to 0.1.1 6 days ago. Its just a guess but maybe you need to update your patch-zerochain branch dependency on schnorrkel too?

opened by ghost 1

Vulnerable crate found in memoffset

By cargo audit,

error: Vulnerable crates found!

ID:	 RUSTSEC-2019-0011
Crate:	 memoffset
Version: 0.2.1
Date:	 2019-07-16
URL:	 https://github.com/Gilnaa/memoffset/issues/9#issuecomment-505461490
Title:	 Flaw in offset_of and span_of causes SIGILL, drops uninitialized memory of arbitrary type on panic in client code
Solution: upgrade to: >= 0.5.0

error: 1 vulnerability found!

bug

opened by osuketh 1

Fix something wrong with the pairing test for a swap of the endian

https://github.com/LayerXcom/zero-chain/blob/49eb9d1e8d51932829fba2d23f7fff7b937e65f9/pairing/src/tests/repr.rs#L38-L54

got the following error.

thread 'bls12_381::fq::fq_repr_tests' panicked at 'assertion failed: `(left == right)`
  left: `FqRepr([5457830654796382876, 14052294085650741142, 9037930377914938456, 17127803672399921366, 8651480755814397574, 10649476550251866400])`,
 right: `FqRepr([10649476550251866400, 8651480755814397574, 17127803672399921366, 9037930377914938456, 14052294085650741142, 5457830654796382876])`', pairing/src/tests/repr.rs:53:13
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
test bls12_381::fq::fq_repr_tests ... FAILED

opened by osuketh 1

define type

I defined the type to fix the following error.

error[E0282]: type annotations needed
   --> modules/indices/src/lib.rs:128:7
    |
128 |         let i = (try_index % enum_set_size).as_();
    |             ^ consider giving `i` a type

error[E0282]: type annotations needed
   --> modules/indices/src/lib.rs:156:8
    |
156 |             let item_index = (try_index % enum_set_size).as_();
    |                 ^^^^^^^^^^ consider giving `item_index` a type

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0282`.
error: could not compile `srml-indices`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

I defined set_index.as_() as usize to avoid following error.

error[E0282]: type annotations needed
   --> modules/indices/src/lib.rs:179:45
    |
179 |         let index = T::AccountIndex::sa(set_index.as_() as usize * ENUM_SET_SIZE + set.len());
    |                                         ----------^^^--
    |                                         |         |
    |                                         |         cannot infer type for type parameter `T` declared on the trait `As`
    |                                         this method call resolves to `T`
    |
    = note: type must be known at this point

error: aborting due to previous error

For more information about this error, try `rustc --explain E0282`.
error: could not compile `srml-indices`

opened by ashWhiteHat 0

Bump smallvec from 0.6.10 to 0.6.14
Bumps smallvec from 0.6.10 to 0.6.14.

Release notes

Sourced from smallvec's releases.

v0.6.14

Fix a possible buffer overflow in insert_many (#252, #254).

v0.6.13

Use the maybe-unit crate in place of soon-to-be-deprecated std::mem::uninitialized (#180). When built with Rust 1.36 or later, this fixes a source of undefined behavior. It also fixes deprecation warnings in Rust 1.39 and later, and test failures when run in MIRI. In Rust 1.35 and earlier it provides some safety improvements but does not completely eliminate undefined behavior. (However, we are not aware of any cases where the undefined behavior causes bugs in practice in those toolchains.)

v0.6.12

Move code using default fn into its own module (#161).

v0.6.11

The unstable alloc feature is no longer needed. This crate can now build with the std feature disabled on stable Rust 1.36 or later (#159).

Commits

5757ac5 Fix potential buffer overflow in insert_many

7852204 Merge pull request #180 from mbrubeck/maybe_uninit

58d5416 Add a test for #139.

26ea2ca Run miri in CI

e64afc8 Use MaybeUninit for storage of inline items.

87f156b Version 0.6.12

e60df76 Version 0.6.11

3ee6d1e Auto merge of #161 - Centril:master, r=emilio

92122e2 Move use of 'default fn' to its own module.

c83bb71 Auto merge of #159 - CryZe:no-std, r=emilio

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dependencies
opened by dependabot[bot] 0
Bump net2 from 0.2.33 to 0.2.37 in /runtime/wasm
Bumps net2 from 0.2.33 to 0.2.37.

Commits

a183475 Release v0.2.37

6081dff haiku: Fix sockaddr_in/sockaddr_in6; Solves #108

71708b7 Release v0.2.36

49b43f2 Do not assume memory layout of std::net::SocketAddr

77a6eb4 Release v0.2.35

eeeab13 Add support for Haiku

1e91530 Release v0.2.34

89945eb Make cargo packaging explicit

fe62962 Clean up trailing whitespace

67ec2c1 Update URLs in Cargo.toml

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dependencies
opened by dependabot[bot] 0
Bump net2 from 0.2.33 to 0.2.37
Bumps net2 from 0.2.33 to 0.2.37.

Commits

a183475 Release v0.2.37

6081dff haiku: Fix sockaddr_in/sockaddr_in6; Solves #108

71708b7 Release v0.2.36

49b43f2 Do not assume memory layout of std::net::SocketAddr

77a6eb4 Release v0.2.35

eeeab13 Add support for Haiku

1e91530 Release v0.2.34

89945eb Make cargo packaging explicit

fe62962 Clean up trailing whitespace

67ec2c1 Update URLs in Cargo.toml

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dependencies
opened by dependabot[bot] 0
Bump miow from 0.2.1 to 0.2.2
Bumps miow from 0.2.1 to 0.2.2.

Commits

6fd7b9c Bump version to 0.2.2

550efc2 Merge branch 'fix-sockaddr-convertion-v0.2.x' into 0.2.x

ca8db53 Stop using from_ne_bytes to be compatible with Rust < 1.32.0

3e217e3 Bump net2 dep to 0.2.36 without invalid SocketAddr convertion

27b77cc Adapt to winapi 0.2

2783715 Safely convert SocketAddr into raw SOCKADDR

f6662ef Clarify wording of license information in README.

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dependencies
opened by dependabot[bot] 0
Bump miow from 0.2.1 to 0.2.2 in /runtime/wasm
Bumps miow from 0.2.1 to 0.2.2.

Commits

6fd7b9c Bump version to 0.2.2

550efc2 Merge branch 'fix-sockaddr-convertion-v0.2.x' into 0.2.x

ca8db53 Stop using from_ne_bytes to be compatible with Rust < 1.32.0

3e217e3 Bump net2 dep to 0.2.36 without invalid SocketAddr convertion

27b77cc Adapt to winapi 0.2

2783715 Safely convert SocketAddr into raw SOCKADDR

f6662ef Clarify wording of license information in README.

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dependencies
opened by dependabot[bot] 0
Bump smallvec from 0.6.10 to 0.6.14 in /runtime/wasm
Bumps smallvec from 0.6.10 to 0.6.14.

Release notes

Sourced from smallvec's releases.

v0.6.14

Fix a possible buffer overflow in insert_many (#252, #254).

v0.6.13

Use the maybe-unit crate in place of soon-to-be-deprecated std::mem::uninitialized (#180). When built with Rust 1.36 or later, this fixes a source of undefined behavior. It also fixes deprecation warnings in Rust 1.39 and later, and test failures when run in MIRI. In Rust 1.35 and earlier it provides some safety improvements but does not completely eliminate undefined behavior. (However, we are not aware of any cases where the undefined behavior causes bugs in practice in those toolchains.)

v0.6.12

Move code using default fn into its own module (#161).

v0.6.11

The unstable alloc feature is no longer needed. This crate can now build with the std feature disabled on stable Rust 1.36 or later (#159).

Commits

5757ac5 Fix potential buffer overflow in insert_many

7852204 Merge pull request #180 from mbrubeck/maybe_uninit

58d5416 Add a test for #139.

26ea2ca Run miri in CI

e64afc8 Use MaybeUninit for storage of inline items.

87f156b Version 0.6.12

e60df76 Version 0.6.11

3ee6d1e Auto merge of #161 - Centril:master, r=emilio

92122e2 Move use of 'default fn' to its own module.

c83bb71 Auto merge of #159 - CryZe:no-std, r=emilio

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Releases(v0.2)

v0.2(Jun 29, 2019)

Add protection from front-running attacks to confidential payment.
Source code(tar.gz)
Source code(zip)
v0.1(Jun 9, 2019)
No fee feature

Generate tx components, then send tx from a browser

Source code(tar.gz)
Source code(zip)

Owner

LayerX

GitHub https://layerxcom.github.io/zerochain-book/

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Related tags

Overview

Zerochain

Status

Initial Setup

Building

Usage and Tutorial

Related Repositories

Documentations

References

Contributing

Maintainers

Comments

v0.6.13

v0.6.12

v0.6.11

v0.6.14

v0.6.13

v0.6.12

v0.6.11

v0.6.14

v0.6.13

v0.6.12

v0.6.11

Releases(v0.2)

v0.2(Jun 29, 2019)

v0.1(Jun 9, 2019)

Owner

LayerX

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