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OKX Proof-of-Reserves

Background

OKX launches Proof of Reserves (PoR) to improve the security and transparency of user's assets. These tools will allow you to independently audit OKX's Proof of Reserves and verify OKX's reserves exceed the exchange's known liabilities to users, in order to confirm the solvency of OKX.

Introduction

Building the source

Reserves part

Download the latest build for your operating system and architecture. Also, you can build the source by yourself.

Building this open source tool requires Go (version >= 1.17).

Install dependencies

 go mod tidy

Compile

make all

Liabilities part

Building this open source tool requires Python(version >=3.9)

Install dependencies

  pip install pycryptodome
  pip install pyinstaller

Compile

  pyinstaller -F zk_STARK_Validator.py

Executable

Proof-of-Reserves executable are in the cmd directory

Command Description
VerifyAddress We have signed a specific message with a private key to each address published by OKX. This tool can be used to verify OKX's signature and verify OKX's ownership of the address.
CheckBalance Configure blockchain node RPC or OKLink API to use this tool, you can check the balance on the chain corresponding to the snapshot height of OKX, then compare it with the balance published by OKX, and query the total assets of OKX's wallet address on the chain.
zkSTARKValidator Current OKX's PoR uses zk-STARK(Zero-Knowledge Scalable Transparent Argument of Knowledge), a cryptographic proof technology, to verify data and prove the authenticity of our audits.
MerkleValidator OKX's PoR uses a Merkle tree, and you can use this tool to check whether your account assets are included in the Merkle tree published by OKX.

Reserves

Download OKX's Proof of Reserves File, verify the ownership of the OKX's public address, and check whether the OKX snapshot height balance is consistent with the published balance. Details here

VerifyAddress

OKX's public file contains address, message "I am an OKX address" and signature. You can use VerifyAddress to verify OKX's ownership of published address.

  ./build/VerifyAddress  --por_csv_filename ./example/okx_por_example.csv

At the same time, you can use third-party tools to verify the ownership of BTC single addresses, EVM , and TRX addresses.

CheckBalance

You can use CheckBalance to verify the OKX wallet address balance with the corresponding block height snapshot. Details here

Sum of all address balances

  ./build/CheckBalance --rpc_json_filename="./example/rpc.json" --por_csv_filename ./example/okx_por_example.csv

Query the snapshot height balance on the chain

./build/CheckBalance --mode="single_coin" --coin_name="ETH" --rpc_json_filename="./example/rpc.json" --por_csv_filename="./example/okx_por_example.csv"

Liabilities

OKX's PoR uses Merkle tree technology to allow each user to independently review OKX's digital asset reserve on the basis of protecting user privacy.

zk-STARK Validator V2 (From 09/27/2024)

Currently, zk-STARK PoR V2 has been released. It is added as a repo's submodule The following is the operation flow of the zk-STARK version V2, almost identical to V1. Verify the inclusion, total balance and non-negative constraints together

  1. Navigate to "Audits" and click Details to access your audit data.
  2. Get the data you need for verification by clicking Copy data and pasting the JSON string as a file in a new folder. The file name must end with "inclusion_proof.json" in a new folder.
  3. Under "Audit files", download the zk-STARK file from the "Liability report" tab.
  4. Unzip the file to reveal a "sum_proof_data.json" file.
  5. Download zk-STARKValidator, the OKX open-source verification tool, and save it to the same folder containing the JSON file.
  6. Open zk-STARKValidator to auto-run the JSON file you saved to check whether the constraints are satisfied.

zk-STARK Validator (From 04/27/2023 to 08/08/2024)

The following is the operation flow of the zk-STARK version. Details here

Verify the inclusion constraint

  1. To verify if your asset balance has been included as a Merkle leaf, navigate to "Audits" and click Details to access your audit data.
  2. Get the data you need for verification by clicking Copy data and pasting the JSON string as a file in a new folder.
  3. Download zk-STARKValidator, the OKX open-source verification tool, and save it to the same folder containing the JSON file.
  4. Open zk-STARKValidator to auto-run the JSON file you saved to check whether the inclusion constraint is satisfied.

Verify the total balance and non-negative constraints

  1. Under "Audit files", download the zk-STARK file from the "Liability report" tab.
  2. Unzip the file to reveal a "sum proof data" folder with branch and trunk folders containing "sum_proof.json," "sum_value.json" files.
  3. Download zk-STARKValidator, the OKX open-source verification tool, and place it in the same root folder as the "sum proof data" folder.
  4. Open zk-STARKValidator to auto-run the unzipped zk-STARK file to check whether the total balance and non-negative constraints are satisfied.

MerkleValidator(From 11/22/2022 to 03/16/2023)

On 03/21, version v2 was released, which is compatible with v1. The following is the operation flow of the two versions

Verification process for v1 version Detail here

  1. Log in to OKX, go to the Audits page to view audit details, download the Merkle tree path data, copy and save it as a file merkle_proof_file.json, and run the following command to check whether your assets are included in the total user assets of OKX.
./build/MerkleValidator --merkle_proof_file ./example/merkle_proof_file.json

Verification process for v2 version Detail here

  1. Visit Full merkle tree file download page to download the full merkle tree file
  2. Login to OKX and visit Audit page to copy and save the data as user_info_file.json
  3. Run the following command to check whether your assets are included in the total user assets of OKX.
./build/MerkleValidator --merkle_file ./example/full-liabilities-merkle-tree.txt --user_info_file ./example/user_info_file.json