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Blockchain-FinalProject-SupplyChainFinancialPlatform

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基于区块链的供应链金融平台

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# 基于区块链的供应链金融平台
> 使用[FISCO BCOS](https://github.com/FISCO-BCOS/FISCO-BCOS)

**For English Introduction, please see the last part: English Introduction**

- [基于区块链的供应链金融平台](#%e5%9f%ba%e4%ba%8e%e5%8c%ba%e5%9d%97%e9%93%be%e7%9a%84%e4%be%9b%e5%ba%94%e9%93%be%e9%87%91%e8%9e%8d%e5%b9%b3%e5%8f%b0)
  - [一、依赖环境](#%e4%b8%80%e4%be%9d%e8%b5%96%e7%8e%af%e5%a2%83)
    - [1. 链端与后端](#1-%e9%93%be%e7%ab%af%e4%b8%8e%e5%90%8e%e7%ab%af)
    - [2. 前端](#2-%e5%89%8d%e7%ab%af)
  - [二、文件说明](#%e4%ba%8c%e6%96%87%e4%bb%b6%e8%af%b4%e6%98%8e)
  - [三、运行](#%e4%b8%89%e8%bf%90%e8%a1%8c)
  - [四、补充](#%e5%9b%9b%e8%a1%a5%e5%85%85)
  - [English Introduction](#english-introduction)

## 一、依赖环境

### 1. 链端与后端
- Ubuntu 18.04
- [FISCO BCOS v2.1.0](https://fisco-bcos-documentation.readthedocs.io/zh_CN/latest/docs/installation.html)
- Python 3.6.3+
- [FISCO BCOS Python SDK](https://fisco-bcos-documentation.readthedocs.io/zh_CN/latest/docs/sdk/python_sdk/install.html)
- [Flask 1.1](http://flask.palletsprojects.com/en/1.1.x/)

### 2. 前端
- MacOS
- Xcode

## 二、文件说明
- 链端：[Loan.sol](./Loan.sol) 合约中实现完整供应链金融平台逻辑
- 后端：[python-sdk/Loan_contract_invoke.py](./python-sdk/Loan_contract_invoke.py)实现对Loan合约调用的封装；[python-sdk/Loan_contract_flask_backend.py](./python-sdk/Loan_contract_flask_backend.py)运行服务端，接受外部请求并返回JSON数据
- 前端：[Loan_UI](./Loan_UI)中是一个完整的iOSApp工程

## 三、运行
Ubuntu配置好依赖环境后，将 `Loan.sol` 部署到节点上，若成功部署，会得到 __合约地址__。你可以先在控制台中调用合约，产生一些实例以及发送交易。

用得到的合约地址替换 `python-sdk/Loan_contract_flask_backend.py`，`Line 9` 中的地址，将语句改为：
``` python
loan_contract = Loan_Contract(address=your_new_address)
```
注意保留双引号

假设在你的Ubuntu中，FISCO BCOS Python SDK路径为 `$FB-Python-SDK`。
 
将 `Loan.sol` 复制到你的 `$FB-Python-SDK/contracts` 中；
 
将 `python-sdk/Loan_contract_invoke.py` 和 `python-sdk/Loan_contract_flask_backend.py` 复制到你的 `$FB-Python-SDK` 中

此时运行 Loan_contract_flask_backend.py，服务端会在8383端口监听请求。
 
请求示例：
 
- 获取名称为A的公司的信息
```
GET: {IP}:8383/get_company_inf/?cpName=A
```
- 获取所有公司A参与交易的单据
```
GET: {IP}:8383/get_receipt/?cpName=A
```
- 获取银行bank_1向公司A提供的信用资产的数额
```
GET: {IP}:8383/get_AmountOfCreditAsset_bank_GiveTo_TrustedCompany/?bName=bank_1&cpName=A
```

在MacOS中打开 `Loan_UI/Loan_UI.xcworkspace`，在Xcode点击运行按钮即可使用前端界面。
 
注意修改 `Loan_UI/Loan_UI/SearchCompanyPage/SearchCompanyViewController.m`，`Loan_UI/Loan_UI/SearchReceiptPage/SearchReceiptViewController.m` 和 `Loan_UI/Loan_UI/SearchCreditAssetPage` 里的URL

## 四、补充
背景介绍、方案设计和功能测试等详见 `17343107_王明业.pdf`。
 
Demo见本目录下的.mp4视频。

## English Introduction

### Project Overview:

Develop a comprehensive platform encompassing the front end, back end, and blockchain layer using the consortium blockchain platform FISCO-BCOS, maintained by Tencent.

### Scenario:

We have three companies: A, B, and C.

- **Company A**: A large enterprise with excellent credit, substantial risk-bearing capacity, and the ability to secure significant financing from banks and other financial institutions.
- **Company B**: A smaller company unable to directly secure large financing from financial institutions.
- **Company C**: Another small company in a similar financial position as Company B.

### Process:

1. **Initial Order**: Company A places an order with Company B for a batch of goods.
2. **Supplementary Order**: To fulfill this order, Company B needs to procure raw materials from Company C.
3. **Funding Shortfall**: Company A currently lacks sufficient funds but issues a promissory note to Company B, guaranteeing payment for the goods.
3. **Bank Loan**: Company B, leveraging Company A's strong credit, uses this promissory note to secure a loan from a bank.
4. **Cascading Credit**: Similarly, Company B issues a promissory note to Company C, enabling Company C to obtain a loan from the bank.

### Challenges with Traditional Methods:

This traditional process is cumbersome, involving extensive authorization and verification steps.

### Solution:

Our project leverages blockchain technology to streamline this credit transfer process. By implementing a blockchain-based supply chain financial platform, we aim to:

- **Increase Efficiency**: Automate and expedite the authorization and verification process.
- **Enhance Transparency**: Provide a tamper-proof ledger of all transactions, ensuring trust among all parties.
- **Improve Accessibility**: Enable smaller companies to access financing using the creditworthiness of larger companies.

By utilizing the FISCO-BCOS platform, we will create a secure, transparent, and efficient supply chain financing solution.

Blockchain-FinalProject-SupplyChainFinancialPlatform

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