Technical Tutorial: Gate.io's zkSNARK-Based Proof of Reserve

Introduction

With 13 million users, Gate.io understands the importance of fund security and has taken effective measures in the industry. Gate.io is one of the earliest exchanges to implement Proof of Reserve (PoR), which was disclosed in May 2020. It was not until the liquidity crisis and bankruptcy caused by FTX misappropriating user assets in 2022 that PoR became known as a solution to safeguard user funds and increase platform trust. Recently, Gate.io announced an upgrade to its PoR solution, introducing zk-SNARK technology and Merkle Tree for enhanced asset security and privacy protection.

This article will take you through the development process of Gate.io‘s Proof of Reserve, step-by-step, to replicate the construction process of the exchange’s Proof of Reserve on your own device.

Background

Merkle Tree is a binary tree of hash values, where each leaf node represents a piece of data or a hash of data. It is used to efficiently verify the integrity of a large amount of data. In the past, a common proof-of-reserve solution involved encrypting user data and generating a Merkle Tree. However, this approach had limitations, as it couldn’t detect negative-value accounts (account values should be greater than or equal to 0) and couldn’t fully protect user privacy.

zk-SNARK is a powerful cryptographic technology. In this solution, we place all user deposits into a Merkle Tree and use zk-SNARK to prove that all balances in the tree are non-negative and sum up to a claimed value. If the publicly disclosed assets on the exchange exceed this value, it can be proven that the exchange has 100% repayment capability.

By combining zk-SNARK with Merkle Tree, we can simultaneously verify the integrity and consistency of the data while protecting the privacy of transactions. Provers can use zk-SNARK to prove that they know a Merkle proof satisfying specific conditions without revealing the specific contents of the proof. This benefits cryptocurrency exchanges as it can demonstrate sufficient funds to meet all debts and protect user privacy.

Program Structure

Plaintext
- circuit    #circuit design
- client    #command
- config    #configuration file
- global    #global variable
- service
        - keygen_service    #service for generating zk keys
        - prover_service    #service for generating proof data
        - tool_service    #common tools
        - userproff_service    #generating user_proof data
        - verify_service    #verification service 
        - witness_service    #service for generating witness data
- utils    #collection of common functions

Preparation

Install Database

1. Mysql: Store proof, user_proof and witness

Plaintext
 docker run -d --name zk-mysql -p 3306:3306 -e MYSQL_USER=zkroot -e MYSQL_PASSWORD=zkpasswd -e MYSQL_DATABASE=zkpos  -e MYSQL_ROOT_PASSWORD=zkpasswd mysql

1. Redis: Distributed Lock

   Plaintext
   docker run -d --name zk-redis -p 6379:6379 redis
   

2. Kvrocks: Store user account tree

   Plaintext
   docker run -d --name zk-kvrocks -p 6666:6666 apache/kvrocks
   

3. If the connection to kvrocks fails after installation: \
   Plan 1: You can try modifying the /var/lib/kvrocks/kvrocks.conf file inside the Docker container. Change it tobind 0.0.0.0 and restart the instance. \
   Plan 2: Install the service using source code.

Install Go environment

To compile the program, you must install the Go programming language environment. You can install it according to your system version. Download Go.

Export Exchange User Asset Data

The structure of the exported exchange user assets.csv data is as follows:

Plaintext
- rn    #sequence
- id    #unique identifier of the user on the exchange
- e_xtoken   #user's xtoken equity, such as e_BTC
- d_xtoken   #user's xtoken debt, such as d_BTC
- x_token     #user's net asset value, x_token = e_xtoken - d_xtoken
- xtoken_usdt_price   #price of xtoken
- total_net_balance_usdt    #total value of all tokens in USDT

You can refer to ./example_data/example_users.csv for specific details.

Recommended System Configuration

The recommended minimum configuration for a production environment is as follows:

• 128GB of memory

• 32-core virtual machine

• 50 GB of disk space

Configuration File

When generating zk keys in a production environment, setting the Batch variable to 864 is recommended, which indicates how many users can be created in one batch. The larger the value, the longer it takes to generate zk keys and proofs. When set to 864, it takes approximately 6 hours to generate zk keys on a 128GB memory, 32-core virtual machine, and 105 seconds to generate a batch of zk proofs.

So, during the debugging phase, you can modify utils/constants.go in BatchCreateUserOpsCounts to 4and then recompile. However, it is recommended to set this parameter to864 in actual production.

If you need to modify Batch, the configuration files that need to be changed are:

• Modify ./config/config.json
  "ZkKeyName": "./zkpor864" => "ZkKeyName": "./zkpor4"

• Modify ./config/cex_config.json
  "ZkKeyVKDirectoryAndPrefix": "./zkpor864" => "ZkKeyVKDirectoryAndPrefix": "./zkpor4"

• Modify ./utils/constants.go
  BatchCreateUserOpsCounts = 864 => BatchCreateUserOpsCounts = 4

Cryptocurrency Settings

• Modify ./utils/constants.go

Cryptocurrency Counts

AssetCounts = 350 => AssetCounts = Required Counts

AssetCounts represents the number of token types included in the exchange, and the actual count should not be lower than the configured value. For example, if there are actually 420 tokens, it can be modified to 500. Considering memory usage, it is recommended to set a reasonable value based on the situation.

Price Precision

AssetTypeForTwoDigits This field is the price precision of 10^2 for assets such as BTTC, SHIB, LUNC, XEC, WIN, BIDR, SPELL, HOT, and DOGE. The default price precision for the rest is 10^8.

Setting up witness configuration

Witness generates witnesses for prover and userproof. The configuration for config.json is as follows:

Plaintext
{
  "MysqlDataSource" : "zkroot:zkpasswd@tcp(127.0.0.1:3306)/zkpos?parseTime=true",  
  "DbSuffix": "202307",
  "UserDataFile": "./example_data/",
  "TreeDB": {
    "Driver": "redis",
    "Option": {
      "Addr": "127.0.0.1:6666"
    }
  },
  "Redis": {
    "Host": "127.0.0.1:6379",
    "Type": "node"
  },
  "ZkKeyName": "./zkpor864"
}

• MysqlDataSource : MySQL database connection

• DbSuffix : Mysql table suffix generated. For example, if you enter the time 202307, it will generate witness202307, you must modify it every time it is generated.

• UserDataFile : Directory of user asset files exported from the exchange, the program will read all the CSV files in this directory.

• TreeDB : configuration related to kvrocks

• Redis : configuration related to redis

• ZkKeyName : The directory where the zk key is located and the prefix, such as zkpor864, will match all files with the prefix zkpor864.* that are related.
  The DbSuffix field is the suffix of the table and must be changed every time. If it is generated once every month, it can also be set according to the time, such as 202306, 202307.

Running the Program

Download the project to your local machine and start compiling the program.

Compiling the Program

Plaintext
make build

If you are using aMac and need to compile binaries for other platforms, you can execute the following commands:

• To compile for Linux on Mac: make build-linux

• To compile for Windows on Mac: make build-windows

Generating Keys

Plaintext
./main keygen

keygen service will generate several key files in the current directory upon completion, as follows:

zkpor864.ccs.ct.save \
zkpor864.ccs.save \
zkpor864.pk.A.save \
zkpor864.pk.B1.save \
zkpor864.pk.B2.save \
zkpor864.pk.E.save \
zkpor864.pk.K.save \
zkpor864.vk.save \
zkpor864.pk.Z.save

If Batch is set to 4, it will be zkpor4.*.save.

This step takes a long time to run. When set to 4, it takes approximately several minutes to complete; when set to 864, it can take several hours.

Note：

• The key generated by the./main keygen command can be used for a long time. If you need to generate asset verification data next month, the zk key will still be valid.

• The zkpor864.vk.savefile will be required for future user verification, so it is recommended to backup and save this batch of zk keys properly.

Clearing historical kvrocks data

If the program has been executed before, before running it again, you need to clean up the account merkle key data that exists in kvrocks, because a different account tree needs to be generated each time.

Plaintext
./main tool clean_kvrocks

Note: This command is used to clear all data in kvrocks, so do not share the same kvrocks with other programs. Wait until the previous data cleaning is complete before starting to generate proof.

Initiating witness service

Plaintext
./main witness

_After the execution is complete, a table with the suffix “witness” will be generated in the Mysql database (based on the DbSuffix in config.json). The table will contain batched witness proof data, which will be used in the subsequent generation of zk proof and user proof.

Generating zk proof

The Prover service is used to generate zk proofs and supports parallel execution. It reads the witness from the witness table in the MySQL.

Run the following command to generate zk proof data:

Plaintext
./main prover

_This command supports parallel execution. You need to copy the main file and related files like zkpor864 to other machines, and make sure to have theconfig.json .

You can run the following command to check the execution status:

Plaintext
./main tool check_prover_status

The execution will end and return:

Plaintext
Total witness item 50, Published item 0, Pending item 0, Finished item 50

Make sure all witness items are in the finished state, which indicates that the prover has finished execution.

_After executing the prover service, an additional table with the suffix “proof” (based on the DbSuffix in config.json) will be created in the Mysql database. The data in this table is intended to be made public to users, allowing them to verify the assets of the exchange in the subsequent verification process. The details will be explained further in the verification section below.

Generating userproof

The userproof service is used to generate and persist user Merkle proofs.

To generate userproof data, run the following command:

Plaintext
./main userproof

Performance: Generates approximately 10k user proofs per second in a 128GB memory and 32-core virtual machine.

_After running the userproof command, a table with the name userproof+suffix (based on the DbSuffix in config.json) will be created in the MySQL database. This table contains user asset information and can be used for permission configuration as needed. This table needs to be made available for specified users to download, in order to verify their own account assets. Further details will be provided in the following verification section.

Providing verification data

Here, we need to provide users with two types of verification:

• Verification of exchange assets

• Verification of user’s own assets
  We need to compile binary executable files for different environments (Mac, Ubuntu, Windows) in advance and provide them for users to download. You can refer to the attached Release for more information.

Verification of Exchange Assets Data and Format

To verify exchange assets, apart from providing users with a binary file, the following three configuration data need to be provided:

1. Downloadproof.csv \
   We export the previously generated proof table as a CSV file (including the header) in advance, such as proof202307.csv, and provide it to the user for downloading.

1. zkpor864.vk.save \
   We need to provide the user with the previously generated zk864 verify key file.

1. Exchange Assets \
   Once the above Proof file is generated, the following command can be used to query the summary based on the user asset table provided by the exchange:

Plaintext
 ./main tool query_cex_assets

1. Receive the following response:

Plaintext
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1. Every time after generating proof data, you need to query the cex assets once and save this data. This data will be used in theCexAssetsInfofield of the cex_config.json file below.
   Note: The proof.csv file here should be from the same batch as the saved asset proof data, otherwise verification failure may occur.

Configuration File

cex_config.json is a configuration file for verifying exchange assets.

Plaintext
{
  "ProofCsv": "./config/proof.csv",
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}

ProofCsv: Specifies the path of the proof.csv table

ZkKeyVKDirectoryAndPrefix: Specifies the path and prefix of the zkpor verify key

CexAssetsInfo: Exchange assets obtained from the above command query

Validate the Required Data and Format for User Assets

• Provide the user_config.jsonfile
  We need to use theuserprooftable generated in the previous user proof section, and then, based on the unique identifier of the user in the provided example_users.csvfile, find the corresponding user in theuserprooftable using theaccount_idfield. Retrieve theconfigfield and save it asuser_config.jsonfor users to download.

The structure of the user_config.json file is as follows:

Plaintext
{
  "Arrangement":7,
  "UniqueIdentification":"00010b7c0a8b51bfa5eca14f0068670bd7fda4063f9bcac4f02c44a00144a80c",
  "TotalAssetEquity":445548224227483774000,
  "TotalAssetDebt":0,
  "AssetDetails":[{"Index":48,"Equity":280,"Debt":0},{"Index":53,"Equity":1020,"Debt":0},{"Index":54,"Equity":3261550200000000,"Debt":0},{"Index":72,"Equity":108600,"Debt":0},{"Index":91,"Equity":9068922000,"Debt":0},{"Index":190,"Equity":13752000,"Debt":0},{"Index":285,"Equity":70860,"Debt":0}],
  "TreeRootHash":"2da42ab6586ef6ad51b4bc8063ce92dcefb951572a26597346b7f78c1329ef0b",
  "MerkleProofEncode":["EmvQ5Sh50gHD96PfN2/o49gT7xVuuX3P22KLVmpWyVo=","JLEw2CGGAPi2TWn7GMbdlwT0wJbpVfJ4A+XLXNYz9X4=","BRCCQWeZy3fmPgiciBNdDMmugJtcQnxfI/b0EU4MlR8=","K8P8ZvYSY9iEreGnatTO8h1/I3Q+ZSkBA3TYYI1vN1g=","GwxhwdTBri22QcY4Pj9B3TkkLpOTGlCpqnsmxVquaeQ=","JIB+i/tDXSbEyK5ASwx2Tgbtm2ckJrJ30qnLm3FGhvs=","I0AzcupyH3clJooxcjaZlOIWOTY531UBJIMpfu2ds9o=","GYU5H/xfC18jR4LXz3axjKgJOaAbSAz3vO/taxTTMDE=","GML/iwCEjgYlSAmd4cQQhKsjH+xscIG6hbM5HP+OP/I=","BBXHrrH1oIGsjK1PsZt1d+ovsDW5IvHxFUlt8CJ3j/M=","F6GyEMWOjvKBgKDCCkQiOfc5SvGEt2MWyQTzszXzd6Y=","JDZjD4o0q6cGYJzj0BBaBEBEN4y4UjYgMSNIXf2P6Ps=","C+Mh1228yGv2Or6yQs3U0sjBzxxWJPTyH5GNG3FzMbk=","Jpo3tkE2KgMxWoEdMM1sOyJsM9YjsI9aONsEEqmMPnA=","FaWOvl42fYbklbc9WgWFqeW3Q/54KXT5zYdIGyCh9iE=","EvcLzRuRio6YT9QjSPp0GGGFYSIW8fKOqQlcOXFBBwo=","LJos88T9kz5kG0o+yeNX0ij+WwrOEIqRVpJtOrUrnns=","CFv3HhUsTXNa3iT/cc+GhD9lV+weuSWoJJRVgZmn7fQ=","EyfPjcon6R+nXBDT/9++ddQqlxiBaSaTMBiC0R6NPoM=","HOtPMAkz3JJG3n0bxNIqkR1p/Q758Em1Jjn1KE6A2mg=","Lq3n7B3Bs7ILnDLG17szIf9O0OdotsWpSLwejnJVcLY=","HthvmzZ/MHbOWVSuFyc9sUvuSz0ddveEwoyQExrim5k=","BOxHEGxRtmNch1R57kgKMxiBVnR/tCo9y3XcJco7Saw=","Dilkpy2L945iR+BsbaffA7MBZSNofd2PdZSkzN48DOE=","Fotw+U5orv9231KkpBYOXM+odtZGgCaNw5zOY+xZ5Oc=","J7pOZTvxtC7B8RzevUvrd90GfrH2oxtRqkEF+mFdCuc=","EUZQwQDUH48osqrtgcPuAQsQvdVKTC+hYmKvIhzImZQ=","HKC2vx3pnDTdfyrzYjCbJMcxojJfvuyzj2/rMMiMplQ="]
}

Providing Final User Content

The file structure that the user finally gets is roughly as follows:

Plaintext
- config 
    cex_config.json
    user_config.json
    proof.csv
zkpor864.vk.save
main

When the binary file “main” is provided, it may be named differently depending on the device.

• Mac OS (Intel)：zkproof_darwin_amd64

• Mac OS (M1)：zkproof_darwin_arm64

• Linux：zkproof_linux_amd64

• Windows：zkproof_windows_amd64.exe

Verifying Exchange Assets

Run the following command to start the verification:

Plaintext
./main verify cex

Verification successful. The output will be:

Plaintext
All proofs verify passed!!!

Verifying User Assets

Plaintext
./main verify user

Verification successful. The output will be:

Plaintext
merkle leave hash: 164bc38a71b7a757455d93017242b4960cd1fea6842d8387b60c5780205858ce
verify pass!!!

Conclusion

Enabling zk-SNARK is an important upgrade for Gate.io‘s proof of reserves and a crucial step in protecting user assets. With excellent security and privacy measures, it brings more confidence to users and sets a new standard for the entire cryptocurrency industry.

You can click here to visit Gate.io‘s Proof of Reserves frontend page and view the proofs generated by the Gate.io team using this project. The code is now openly available on GitHub. We invite anyone interested in decentralized exchanges, zk-SNARK, and MerkleTree technology to join this project. Whether you want to provide suggestions, report bugs, or submit code, your participation is always welcome.