技术教程:Gate io基于zk-SANRK技术的储备金证明

进阶Dec 11, 2023
作为最早实施储备金证明的交易所,Gate.io再次利用zk-SANRK技术对储备金证明技术进行升级,本文将带你利用Gate.io开源的技术,在自己的设备验证交易所资产和自身资产的安全性。
技术教程:Gate io基于zk-SANRK技术的储备金证明

引言

拥有1,300万用户的Gate.io深知资金安全的重要性,并在行业中率先采取了有效措施。Gate.io是最早实施储备金证明的交易所之一,在2020年5月就进行了储备金证明的披露。而2022年交易所FTX挪用用户资产导致流动性危机破产后,储备金证明才作为保障用户资金安全、提高平台信任度的解决方案被大众熟知。就在最近,Gate.io宣布再次升级储备金证明方案:引入zk-SNARK技术与Merkle Tree(默克尔树)技术结合,为用户带来更加卓越的资产安全保护和隐私保护。

本文将带你走进Gate.io储备金证明的开发过程,逐步在自己的设备上重现交易所的储备金证明搭建过程。

背景知识

Merkle Tree 是哈希值的二叉树,其中每个叶节点代表一条数据或一条数据的哈希。它用于有效地验证大量数据的完整性。通过将用户数据加密后生成默克尔树是过去常用的储备金证明方案,但这种方案的劣势是其不能检验出负值账户(正常账户价值应该大于或等于0)且无法完整地保护用户隐私。

zk-SNARK 是密码学中的一项强大技术,我们将把所有用户的存款放入一颗 Merkle 树中,并用 zk-SNARK 来证明树中所有的余额都是非负的,且总和为某个声称的值。如果交易所链上公开的资产大于该值,则可以证明该交易所有 100% 偿还能力。

将 zk-SNARK 与 Merkle Tree 结合使用,可以实现同时验证数据的完整性和一致性,还可以保护交易的隐私。证明者可以使用 zk-SNARK 证明他们知道一个满足特定条件的 Merkle 证明,而无需透露证明的具体内容。这对于数字货币交易所来说,既可以证明他们有足够的资金来满足所有的债务,又可以保护平台用户隐私。

程序结构

Plaintext
- circuit    #电路设计
- client    #command 命令
- config    #配置文件
- global    #全局变量
- service
        - keygen_service    #生成zk密钥的服务
        - prover_service    #生成proof数据
        - tool_service    #常用的工具
        - userproff_service    #生成user_proof数据
        - verify_service    #验证服务
        - witness_service    #生成witness相关数据
- utils    #常用的function集合

准备工作

安装数据库

  1. Mysql : 存储proof, user_proof以及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
    
  2. Redis : 分布式锁
    Plaintext
    docker run -d --name zk-redis -p 6379:6379 redis
    
  3. Kvrocks : 存储user account tree
    Plaintext
    docker run -d --name zk-kvrocks -p 6666:6666 apache/kvrocks
    
  4. 如果 kvrocks 安装后连接失败:
    方案1:可以尝试修改 docker 内 /var/lib/kvrocks/kvrocks.conf 文件,修改为 bind 0.0.0.0 并重新启动实例。
    方案2:使用源码安装服务。

安装Go环境

编译程序需要使用 Go语言环境,可以根据系统版本自行安装 Download Go

导出交易所用户资产数据

导出的交易所用户资产.csv数据结构如下:

Plaintext
- rn    #序列
- id    #交易所的用户唯一标识
- e_xtoken   #用户xtoken equity,如 e_BTC
- d_xtoken   #用户xtoken debt,如 d_BTC
- x_token     #用户资产净值,x_token  =  e_xtoken - d_xtoken
- xtoken_usdt_price   #xtoken的价格
- total_net_balance_usdt    #用户所有的token usdt价值

具体可参考 ./example_data/example_users.csv

推荐系统配置

正式环境建议不低于以下配置:

  • 128GB 内存
  • 32 核虚拟机
  • 50 GB 磁盘空间

配置文件

在正式环境生成zk密钥时,Batch 变量推荐设置为 864 ,表示一批可以创建多少个用户。数值越大,生成与 zk 密钥和证明所需的时间就越长。当设置为 864时,在 128GB 内存、32 核虚拟机中,生成 zk 相关密钥大约需要 6 小时,生成一批 zk 证明需要 105 秒。

所以在调试阶段,可以修改 utils/constants.go 中的 BatchCreateUserOpsCounts 修改为 4,然后再进行重新编译。但是在实际生产中还是建议这个参数为 864

如果修改要修改 Batch,则需要变动的配置文件:

  • 修改 ./config/config.json
    "ZkKeyName": "./zkpor864" => "ZkKeyName": "./zkpor4"
  • 修改 ./config/cex_config.json
    "ZkKeyVKDirectoryAndPrefix": "./zkpor864" => "ZkKeyVKDirectoryAndPrefix": "./zkpor4"
  • 修改 ./utils/constants.go
    BatchCreateUserOpsCounts = 864 => BatchCreateUserOpsCounts = 4

币种设置

  • 修改 ./utils/constants.go

币种数量

AssetCounts = 350 => AssetCounts = 所需大小

AssetCounts 表示交易所包含的 token 种类,实际数量不可低于设置的值。比如实际有420个,可修改为500。考虑到内存占用,建议根据情况设置合理的值。

价格精度

AssetTypeForTwoDigits 字段含义为 10^2 价格精度,如 BTTC、SHIB、LUNC、XEC、WIN、BIDR、SPELL、HOT、 DOGE。其余的默认价格精度为 10^8。

设置 witness 相关配置

witness 用于为 prover 和 userproof 生成见证,config.json 配置如下 :

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数据库链接
  • DbSuffix : Mysql生成的表后缀, 比如填写时间202307,就会生成witness202307,每次生成时必须修改
  • UserDataFile : 交易所导出的用户资产文件目录,程序将读取这个目录下所有的csv文件
  • TreeDB : kvrocks相关的配置
  • Redis : redis相关配置
  • ZkKeyName : zk密钥所在目录以及前缀,如 zkpor864 则匹配所有文件名前缀为 zkpor864.* 相关的文件
    DbSuffix字段是表的后缀,每次都必须更改,如果是每个月生成一次,也可以按照时间202306,202307设置。

运行程序

将项目下载至本地,并开始编译程序。

编译程序

Plaintext
make build

如果你是在 Mac 电脑下需要编译其他平台二进制程序可以执行下面命令:

  • 在 mac 编译 linux: make build-linux.
  • 在 mac 编译 windows: make build-windows

生成密钥

Plaintext
./main keygen

keygen服务运行完成后,会在当前目录下生成几个密钥文件,如下:

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

如果 Batch 设置为 4 时,为 zkpor4.*.save

该步骤运行时间较长,在设置为 4 时,大致运行数分钟;设置为 864 时,可达数个小时。

注意:

  • ./main keygen 命令生成的密钥,可长久使用。如下个月需再生成资产验证数据时,该zk密钥依然可用。
  • 后续用户验证环节需要使用 zkpor864.vk.save文件,因此建议这批zk密钥做备份妥善保存。

清空历史 kvrocks 数据

如果之前运行过程序,在执行之前,需要先清理一下之前存在 kvrocks 里面的 account merkle key 数据,因为每次都需要生成不同的 account tree。

Plaintext
./main tool clean_kvrocks

注意:这个命令是清楚kvrocks里面所有数据,所以不要和其他程序共用一个kvrocks,待之前的数据清理完成之后再开始生成 proof。

启动 witness 服务

Plaintext
./main witness

_运行完成后,会在 Mysql 数据库生成 witness+后缀的表(根据config.json中的DbSuffix),表里面是按照批次 witness proof 数据,表中数据将在后续的生成 zk proof 和 user proof 中发挥作用

生成 zk proof

Prover 服务用于生成zk证明,支持并行运行。它从 mysql 内的 witness table 中读取 witness。

运行以下命令生成 zk proof 数据:

Plaintext
./main prover

_该命令支持并线运行,需要将 main 文件与 zkpor864 等相关文件拷贝到其他机器,并确保config.json 文件配置相同,这样可以通过 redis 作为分布式锁同时运行。

可以运行以下命令查询查询执行状态:

Plaintext
./main tool check_prover_status

结束执行则返回。

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

确保所有的 witness item 都是 finished 状态,就说明 prover 执行完毕。

_在执行完prover服务之后,Mysql数据库里面会多一张 proof+后缀的表(根据config.json中的DbSuffix),表中的数据是需要公开给用户,方便用户后面去验证交易所资产,下面在 verify 环节会具体说明

生成user proof

userproof 服务用于生成和持久化用户merkle证明。

运行以下命令生成 user proof 数据:

Plaintext
./main userproof

性能:在 128GB 内存和 32 核虚拟机中每秒生成约 10k 个用户的证明

_在运行完 userproof 命令后,会在 mysql 数据库生成一张 userproof+后缀(根据config.json中的DbSuffix)的表,这个表里面的数据包含了用户的资产信息,可以按需做权限配置。该表需要开放给指定的用户下载,用于做自身账号资产证明,具体在下面的 verify 环节会具体说明

提供验证数据

这里我们需要给用户提供两种验证:

  • 验证交易所的资产
  • 验证用户自己的资产
    我们需要提前编译好不同环节的二进制执行文件(mac ubuntu windows)提供给用户下载,可参考 Release 附件。

验证交易所资产所需数据与格式

验证交易所资产除了提供给用户二进制文件之外,还需要提供以下三个配置数据:

  1. 下载proof.csv
    我们提前把之前生成的proof表导出成csv文件(需要包含表头),如 proof202307.csv 提供给用户下载。

  2. zkpor864.vk.save
    我们需要提供给用户之前生成的zk864的verify key文件。

  3. 交易所的资产
    上述 Proof 文件生成后,可以用下面的命令查询出根据交易所提供的用户资产表的汇总:

Plaintext
 ./main tool query_cex_assets
  1. 会得到如下返回:
Plaintext
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  1. 每次执行完生成 proof 数据之后,都需要查询一次 cex assets,然后把这个数据保存下来,该数据将用于下面的 cex_config.jsonCexAssetsInfo 字段中。
    注意:这里的 proof.csv 文件与上述保存的资产证明数据应同一批次,否则会出现验证失败的问题

配置文件

cex_config.json 为验证交易所资产的配置文件:

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

ProofCsv : 指定proof.csv表的路径

ZkKeyVKDirectoryAndPrefix: 指定zkpor verify key的路径以及前缀

CexAssetsInfo: 交易所资产,由上面命令查询得出

验证用户资产所需数据与格式

  • 提供user_config.json文件
    我们需要用到上面 user proof 环节生成的userproof表,然后根据之前提供的交易所用户资产example_users.csv中用户唯一标识,对应userproof表中的account_id字段找到该用户,将config字段查询出来,保存为user_config.json中,提供给用户下载即可。

user_config.json文件结构如下:

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="]
}

最终提供用户内容

所以用户最终获得的文件结构大致如下:

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

二进制文件 main 提供时,可能根据设备不同命名也有所不同

  • Mac OS(Intel):zkproof_darwin_amd64
  • Mac OS(M1):zkproof_darwin_arm64
  • Linux:zkproof_linux_amd64
  • Windows:zkproof_windows_amd64.exe

用户验证交易所资产

运行以下命令开始验证:

Plaintext
./main verify cex

验证成功会输出:

Plaintext
All proofs verify passed!!!

用户验证自身资产

Plaintext
./main verify user

验证成功会输出:

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

结语

启用zk-SNARK是Gate.io储备金证明的重要升级,也是Gate.io在用户资产安全保护上的重要行动之一。卓越的安全和隐私双重保障,将为用户带来了更多的信心,也为整个加密货币行业树立新的典范。

您可以点击链接跳转Gate.io储备金金前端页面,查看由Gate.io团队利用此项目生成的证明。目前代码已经公开在了Github。所有对于去信任化交易所、对zk-SNARK 和 MerkleTree 技术感兴趣的朋友,无论是提出建议、报告bug,还是提交代码,我们都欢迎参与到本项目中。

作者: Gate learn
译者: Sonia
文章审校: Wayne、KOWEI、Elisa、Ashley、Joyce
* 投资有风险,入市须谨慎。本文不作为Gate.io提供的投资理财建议或其他任何类型的建议。
* 在未提及Gate.io的情况下,复制、传播或抄袭本文将违反《版权法》,Gate.io有权追究其法律责任。

技术教程:Gate io基于zk-SANRK技术的储备金证明

进阶Dec 11, 2023
作为最早实施储备金证明的交易所,Gate.io再次利用zk-SANRK技术对储备金证明技术进行升级,本文将带你利用Gate.io开源的技术,在自己的设备验证交易所资产和自身资产的安全性。
技术教程:Gate io基于zk-SANRK技术的储备金证明

引言

拥有1,300万用户的Gate.io深知资金安全的重要性,并在行业中率先采取了有效措施。Gate.io是最早实施储备金证明的交易所之一,在2020年5月就进行了储备金证明的披露。而2022年交易所FTX挪用用户资产导致流动性危机破产后,储备金证明才作为保障用户资金安全、提高平台信任度的解决方案被大众熟知。就在最近,Gate.io宣布再次升级储备金证明方案:引入zk-SNARK技术与Merkle Tree(默克尔树)技术结合,为用户带来更加卓越的资产安全保护和隐私保护。

本文将带你走进Gate.io储备金证明的开发过程,逐步在自己的设备上重现交易所的储备金证明搭建过程。

背景知识

Merkle Tree 是哈希值的二叉树,其中每个叶节点代表一条数据或一条数据的哈希。它用于有效地验证大量数据的完整性。通过将用户数据加密后生成默克尔树是过去常用的储备金证明方案,但这种方案的劣势是其不能检验出负值账户(正常账户价值应该大于或等于0)且无法完整地保护用户隐私。

zk-SNARK 是密码学中的一项强大技术,我们将把所有用户的存款放入一颗 Merkle 树中,并用 zk-SNARK 来证明树中所有的余额都是非负的,且总和为某个声称的值。如果交易所链上公开的资产大于该值,则可以证明该交易所有 100% 偿还能力。

将 zk-SNARK 与 Merkle Tree 结合使用,可以实现同时验证数据的完整性和一致性,还可以保护交易的隐私。证明者可以使用 zk-SNARK 证明他们知道一个满足特定条件的 Merkle 证明,而无需透露证明的具体内容。这对于数字货币交易所来说,既可以证明他们有足够的资金来满足所有的债务,又可以保护平台用户隐私。

程序结构

Plaintext
- circuit    #电路设计
- client    #command 命令
- config    #配置文件
- global    #全局变量
- service
        - keygen_service    #生成zk密钥的服务
        - prover_service    #生成proof数据
        - tool_service    #常用的工具
        - userproff_service    #生成user_proof数据
        - verify_service    #验证服务
        - witness_service    #生成witness相关数据
- utils    #常用的function集合

准备工作

安装数据库

  1. Mysql : 存储proof, user_proof以及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
    
  2. Redis : 分布式锁
    Plaintext
    docker run -d --name zk-redis -p 6379:6379 redis
    
  3. Kvrocks : 存储user account tree
    Plaintext
    docker run -d --name zk-kvrocks -p 6666:6666 apache/kvrocks
    
  4. 如果 kvrocks 安装后连接失败:
    方案1:可以尝试修改 docker 内 /var/lib/kvrocks/kvrocks.conf 文件,修改为 bind 0.0.0.0 并重新启动实例。
    方案2:使用源码安装服务。

安装Go环境

编译程序需要使用 Go语言环境,可以根据系统版本自行安装 Download Go

导出交易所用户资产数据

导出的交易所用户资产.csv数据结构如下:

Plaintext
- rn    #序列
- id    #交易所的用户唯一标识
- e_xtoken   #用户xtoken equity,如 e_BTC
- d_xtoken   #用户xtoken debt,如 d_BTC
- x_token     #用户资产净值,x_token  =  e_xtoken - d_xtoken
- xtoken_usdt_price   #xtoken的价格
- total_net_balance_usdt    #用户所有的token usdt价值

具体可参考 ./example_data/example_users.csv

推荐系统配置

正式环境建议不低于以下配置:

  • 128GB 内存
  • 32 核虚拟机
  • 50 GB 磁盘空间

配置文件

在正式环境生成zk密钥时,Batch 变量推荐设置为 864 ,表示一批可以创建多少个用户。数值越大,生成与 zk 密钥和证明所需的时间就越长。当设置为 864时,在 128GB 内存、32 核虚拟机中,生成 zk 相关密钥大约需要 6 小时,生成一批 zk 证明需要 105 秒。

所以在调试阶段,可以修改 utils/constants.go 中的 BatchCreateUserOpsCounts 修改为 4,然后再进行重新编译。但是在实际生产中还是建议这个参数为 864

如果修改要修改 Batch,则需要变动的配置文件:

  • 修改 ./config/config.json
    "ZkKeyName": "./zkpor864" => "ZkKeyName": "./zkpor4"
  • 修改 ./config/cex_config.json
    "ZkKeyVKDirectoryAndPrefix": "./zkpor864" => "ZkKeyVKDirectoryAndPrefix": "./zkpor4"
  • 修改 ./utils/constants.go
    BatchCreateUserOpsCounts = 864 => BatchCreateUserOpsCounts = 4

币种设置

  • 修改 ./utils/constants.go

币种数量

AssetCounts = 350 => AssetCounts = 所需大小

AssetCounts 表示交易所包含的 token 种类,实际数量不可低于设置的值。比如实际有420个,可修改为500。考虑到内存占用,建议根据情况设置合理的值。

价格精度

AssetTypeForTwoDigits 字段含义为 10^2 价格精度,如 BTTC、SHIB、LUNC、XEC、WIN、BIDR、SPELL、HOT、 DOGE。其余的默认价格精度为 10^8。

设置 witness 相关配置

witness 用于为 prover 和 userproof 生成见证,config.json 配置如下 :

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数据库链接
  • DbSuffix : Mysql生成的表后缀, 比如填写时间202307,就会生成witness202307,每次生成时必须修改
  • UserDataFile : 交易所导出的用户资产文件目录,程序将读取这个目录下所有的csv文件
  • TreeDB : kvrocks相关的配置
  • Redis : redis相关配置
  • ZkKeyName : zk密钥所在目录以及前缀,如 zkpor864 则匹配所有文件名前缀为 zkpor864.* 相关的文件
    DbSuffix字段是表的后缀,每次都必须更改,如果是每个月生成一次,也可以按照时间202306,202307设置。

运行程序

将项目下载至本地,并开始编译程序。

编译程序

Plaintext
make build

如果你是在 Mac 电脑下需要编译其他平台二进制程序可以执行下面命令:

  • 在 mac 编译 linux: make build-linux.
  • 在 mac 编译 windows: make build-windows

生成密钥

Plaintext
./main keygen

keygen服务运行完成后,会在当前目录下生成几个密钥文件,如下:

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

如果 Batch 设置为 4 时,为 zkpor4.*.save

该步骤运行时间较长,在设置为 4 时,大致运行数分钟;设置为 864 时,可达数个小时。

注意:

  • ./main keygen 命令生成的密钥,可长久使用。如下个月需再生成资产验证数据时,该zk密钥依然可用。
  • 后续用户验证环节需要使用 zkpor864.vk.save文件,因此建议这批zk密钥做备份妥善保存。

清空历史 kvrocks 数据

如果之前运行过程序,在执行之前,需要先清理一下之前存在 kvrocks 里面的 account merkle key 数据,因为每次都需要生成不同的 account tree。

Plaintext
./main tool clean_kvrocks

注意:这个命令是清楚kvrocks里面所有数据,所以不要和其他程序共用一个kvrocks,待之前的数据清理完成之后再开始生成 proof。

启动 witness 服务

Plaintext
./main witness

_运行完成后,会在 Mysql 数据库生成 witness+后缀的表(根据config.json中的DbSuffix),表里面是按照批次 witness proof 数据,表中数据将在后续的生成 zk proof 和 user proof 中发挥作用

生成 zk proof

Prover 服务用于生成zk证明,支持并行运行。它从 mysql 内的 witness table 中读取 witness。

运行以下命令生成 zk proof 数据:

Plaintext
./main prover

_该命令支持并线运行,需要将 main 文件与 zkpor864 等相关文件拷贝到其他机器,并确保config.json 文件配置相同,这样可以通过 redis 作为分布式锁同时运行。

可以运行以下命令查询查询执行状态:

Plaintext
./main tool check_prover_status

结束执行则返回。

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

确保所有的 witness item 都是 finished 状态,就说明 prover 执行完毕。

_在执行完prover服务之后,Mysql数据库里面会多一张 proof+后缀的表(根据config.json中的DbSuffix),表中的数据是需要公开给用户,方便用户后面去验证交易所资产,下面在 verify 环节会具体说明

生成user proof

userproof 服务用于生成和持久化用户merkle证明。

运行以下命令生成 user proof 数据:

Plaintext
./main userproof

性能:在 128GB 内存和 32 核虚拟机中每秒生成约 10k 个用户的证明

_在运行完 userproof 命令后,会在 mysql 数据库生成一张 userproof+后缀(根据config.json中的DbSuffix)的表,这个表里面的数据包含了用户的资产信息,可以按需做权限配置。该表需要开放给指定的用户下载,用于做自身账号资产证明,具体在下面的 verify 环节会具体说明

提供验证数据

这里我们需要给用户提供两种验证:

  • 验证交易所的资产
  • 验证用户自己的资产
    我们需要提前编译好不同环节的二进制执行文件(mac ubuntu windows)提供给用户下载,可参考 Release 附件。

验证交易所资产所需数据与格式

验证交易所资产除了提供给用户二进制文件之外,还需要提供以下三个配置数据:

  1. 下载proof.csv
    我们提前把之前生成的proof表导出成csv文件(需要包含表头),如 proof202307.csv 提供给用户下载。

  2. zkpor864.vk.save
    我们需要提供给用户之前生成的zk864的verify key文件。

  3. 交易所的资产
    上述 Proof 文件生成后,可以用下面的命令查询出根据交易所提供的用户资产表的汇总:

Plaintext
 ./main tool query_cex_assets
  1. 会得到如下返回:
Plaintext
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  1. 每次执行完生成 proof 数据之后,都需要查询一次 cex assets,然后把这个数据保存下来,该数据将用于下面的 cex_config.jsonCexAssetsInfo 字段中。
    注意:这里的 proof.csv 文件与上述保存的资产证明数据应同一批次,否则会出现验证失败的问题

配置文件

cex_config.json 为验证交易所资产的配置文件:

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

ProofCsv : 指定proof.csv表的路径

ZkKeyVKDirectoryAndPrefix: 指定zkpor verify key的路径以及前缀

CexAssetsInfo: 交易所资产,由上面命令查询得出

验证用户资产所需数据与格式

  • 提供user_config.json文件
    我们需要用到上面 user proof 环节生成的userproof表,然后根据之前提供的交易所用户资产example_users.csv中用户唯一标识,对应userproof表中的account_id字段找到该用户,将config字段查询出来,保存为user_config.json中,提供给用户下载即可。

user_config.json文件结构如下:

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="]
}

最终提供用户内容

所以用户最终获得的文件结构大致如下:

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

二进制文件 main 提供时,可能根据设备不同命名也有所不同

  • Mac OS(Intel):zkproof_darwin_amd64
  • Mac OS(M1):zkproof_darwin_arm64
  • Linux:zkproof_linux_amd64
  • Windows:zkproof_windows_amd64.exe

用户验证交易所资产

运行以下命令开始验证:

Plaintext
./main verify cex

验证成功会输出:

Plaintext
All proofs verify passed!!!

用户验证自身资产

Plaintext
./main verify user

验证成功会输出:

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

结语

启用zk-SNARK是Gate.io储备金证明的重要升级,也是Gate.io在用户资产安全保护上的重要行动之一。卓越的安全和隐私双重保障,将为用户带来了更多的信心,也为整个加密货币行业树立新的典范。

您可以点击链接跳转Gate.io储备金金前端页面,查看由Gate.io团队利用此项目生成的证明。目前代码已经公开在了Github。所有对于去信任化交易所、对zk-SNARK 和 MerkleTree 技术感兴趣的朋友,无论是提出建议、报告bug,还是提交代码,我们都欢迎参与到本项目中。

作者: Gate learn
译者: Sonia
文章审校: Wayne、KOWEI、Elisa、Ashley、Joyce
* 投资有风险,入市须谨慎。本文不作为Gate.io提供的投资理财建议或其他任何类型的建议。
* 在未提及Gate.io的情况下,复制、传播或抄袭本文将违反《版权法》,Gate.io有权追究其法律责任。
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