Medical Smart Contract Crypto Value Chain

Writing a smart contract with on- and off-ramps for fiat transactions, while integrating detailed processes for managing donations for a child in Sub-Saharan Africa, involves careful design, coding, and structuring. Here’s a detailed breakdown of how you could approach this:

1. Define the Goals and Flow of the Smart Contract

Goals:

Facilitate the secure receipt of donations in fiat or cryptocurrency.
Enable transparent disbursement of funds to intermediaries (e.g., outreach programs, surgeons, healthcare providers).
Ensure verification of key milestones (e.g., the child receiving treatment).

Workflow Overview:

Donor Interaction:
- Donors can contribute using fiat or cryptocurrency.
- Use fiat-to-crypto gateways (like MoonPay or Ramp) for fiat donations.
- Donations are tracked on the blockchain for transparency.
Verification Intermediary:
- A trusted intermediary (e.g., an outreach program) verifies the child’s identity, need, and eligibility.
Allocation:
- Funds are locked in escrow within the smart contract.
- Disbursement occurs upon verification of milestones (e.g., treatment scheduled, surgery completed).
Completion:
- Milestone completion triggers payments to service providers and other involved parties.

2. Write the Smart Contract

Technology Stack:

Blockchain: Ethereum (or similar platforms like Polygon for lower fees).
Language: Solidity (Ethereum’s primary language for smart contracts).
Oracles: Chainlink to integrate real-world data for verification (e.g., completion of surgery).

Core Features of the Smart Contract:

Donation Functionality: Accepts contributions in both fiat and crypto, using on-ramps to convert fiat to crypto.
Escrow System: Holds funds until milestones are verified by oracles or intermediaries.
Verification Logic: Implements conditions for releasing funds, based on data provided by the intermediary.
Reporting Mechanism: Ensures all transactions are publicly accessible for transparency.

Here’s an example snippet of a smart contract written in Solidity:

solidity

pragma solidity ^0.8.0;

import “@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol”;

contract ChildDonation {
address public admin;
address public intermediary;
mapping(address => uint256) public donations;
bool public milestoneVerified = false;

event DonationReceived(address indexed donor, uint256 amount);
event MilestoneVerified(bool verified);
event FundsReleased(address indexed recipient, uint256 amount);

constructor(address _intermediary) {
admin = msg.sender;
intermediary = _intermediary;
}

modifier onlyAdmin() {
require(msg.sender == admin, “Only admin can perform this action”);
_;
}

function donate() external payable {
require(msg.value > 0, “Donation must be greater than zero”);
donations[msg.sender] += msg.value;
emit DonationReceived(msg.sender, msg.value);
}

function verifyMilestone(bool _verified) external {
require(msg.sender == intermediary, “Only intermediary can verify”);
milestoneVerified = _verified;
emit MilestoneVerified(_verified);
}

function releaseFunds(address payable _recipient) external onlyAdmin {
require(milestoneVerified, “Milestone not verified”);
uint256 balance = address(this).balance;
_recipient.transfer(balance);
emit FundsReleased(_recipient, balance);
}
}

3. Videos for Donors and Stakeholders

Video 1: Introduction to the Problem

Content: Show the child’s background and the challenges faced in accessing healthcare. Include visuals of the child, the living conditions, and the community.
Goal: Evoke empathy and highlight the importance of the donor’s contribution.

Video 2: How the Smart Contract Ensures Transparency

Content: Demonstrate how the blockchain ensures accountability. Include a walkthrough of how donations are tracked and milestones verified.
Goal: Build trust in the system by emphasizing transparency.

Video 3: The Journey of Hope

Content: Show the process from donation to surgery completion. Include steps like intermediary verification, treatment progress, and the child’s improved quality of life.
Goal: Showcase the impact of donations and encourage further support.

4. Addressing Verification Needs

Verification Components:

Identity Verification:
- Use decentralized identifiers (DIDs) for securely managing the child’s identity.
Milestone Tracking:
- Partner with trusted entities to report on treatment milestones (e.g., hospital admission, surgery completion).
Oracles:
- Integrate Chainlink to pull real-world data (e.g., hospital records) into the smart contract.

5. Integration with Fiat On/Off Ramps

On-Ramps:
- Use services like Ramp Network or MoonPay to allow fiat contributions.
- Convert fiat into stablecoins or other cryptocurrencies supported by the smart contract.
Off-Ramps:
- Partner with local financial institutions to disburse funds in fiat to service providers.

6. Ethical Considerations

Privacy: Ensure all personal data about the child is protected.
Transparency: Use blockchain to provide an immutable record of transactions.
Local Empowerment: Collaborate with local intermediaries and service providers.

This system combines blockchain technology, ethical practices, and powerful storytelling to create a transparent, impactful way to support children in need.

if one step of releasing a crypto coin was the uploading of a video how would I do that onto a blockchain

ChatGPT

Uploading a video onto a blockchain is a complex process because blockchains are not optimized for storing large files like videos due to scalability and cost constraints. However, there are ways to integrate video storage with blockchain in a decentralized manner. Here’s how you can do it:

Steps to Upload a Video Onto or Via a Blockchain

1. Understand the Role of the Blockchain

Blockchains are typically used to store references (hashes or metadata) to large files stored off-chain.
You store the video itself in a decentralized storage network like IPFS (InterPlanetary File System) or Arweave, and the blockchain stores the hash or pointer.

2. Choose a Blockchain Platform

Select a blockchain compatible with storing or referencing off-chain data.
- Ethereum: Use smart contracts to link to video content stored in IPFS or Arweave.
- Binance Smart Chain, Solana, Polygon: These offer lower fees and faster transaction times compared to Ethereum.
- Filecoin or Arweave: Designed for decentralized file storage and can store videos directly.

3. Upload the Video to Decentralized Storage

Decentralized storage networks are designed for this purpose:

IPFS:
- Install an IPFS node or use a service like Pinata for file uploads.
- Upload the video, which generates a unique content identifier (CID).
- Example:
  bash
  ipfs add your-video-file.mp4
  The command returns a CID, e.g., QmTzQ1c..., which serves as the address of your video.
Arweave:
- Arweave provides permanent storage for files at a fixed cost.
- Upload via the Arweave gateway or SDK.

4. Record the Video Hash on the Blockchain

Store the CID or Arweave address on a blockchain to create an immutable reference to the video.

Write a smart contract to store metadata and the CID. Here’s an example in Solidity for Ethereum:

solidity

pragma solidity ^0.8.0;

contract VideoRegistry {
struct Video {
string cid; // IPFS content identifier
string title;
address uploader;
uint256 timestamp;
}

mapping(uint256 => Video) public videos;
uint256 public videoCount;

event VideoUploaded(uint256 videoId, string cid, string title, address uploader, uint256 timestamp);

function uploadVideo(string memory _cid, string memory _title) public {
videos[videoCount] = Video(_cid, _title, msg.sender, block.timestamp);
emit VideoUploaded(videoCount, _cid, _title, msg.sender, block.timestamp);
videoCount++;
}
}

5. Integrate Video Viewing

Once the CID is stored on the blockchain, you can retrieve and display the video using the CID. For instance:

A web application can fetch the CID from the blockchain.
Use the IPFS or Arweave gateway (e.g., https://ipfs.io/ipfs/<CID>) to stream or download the video.

6. Additional Features

You can enhance the system with:

Ownership Tokens: Create NFTs representing ownership of the video.
Access Control: Use smart contracts to control who can view the video (e.g., paid access).
Verification: Hash the video file and compare it to the on-chain hash to ensure integrity.

Considerations

Storage Costs: Decentralized storage can incur costs. Estimate the size and duration of storage required.
Scalability: Avoid directly uploading the video to the blockchain due to high gas fees and storage limitations.
Legal Compliance: Ensure the video content complies with regulations and avoids sensitive or copyrighted material.

By using a combination of blockchain and decentralized storage, you create a transparent, verifiable system for uploading and managing videos.

Uploading a YouTube link (or any other video link) to a blockchain involves storing the link as metadata in a transaction or smart contract. Here’s how to achieve it:

Steps to Upload a YouTube Link to a Blockchain

1. Choose the Blockchain

Select a blockchain suitable for storing metadata:
- Ethereum: Popular for smart contracts and metadata storage.
- Polygon or Binance Smart Chain: Cheaper alternatives with similar functionality.
- Solana: Known for high speed and low costs.

2. Write a Smart Contract to Store Links

Use a smart contract to store and retrieve the YouTube link. Here’s an example in Solidity for Ethereum or compatible blockchains:

solidity

pragma solidity ^0.8.0;

contract VideoLinkRegistry {
struct Video {
string youtubeLink;
string title;
address uploader;
uint256 timestamp;
}

mapping(uint256 => Video) public videos;
uint256 public videoCount;

event VideoUploaded(uint256 videoId, string youtubeLink, string title, address uploader, uint256 timestamp);

function uploadVideo(string memory _youtubeLink, string memory _title) public {
videos[videoCount] = Video(_youtubeLink, _title, msg.sender, block.timestamp);
emit VideoUploaded(videoCount, _youtubeLink, _title, msg.sender, block.timestamp);
videoCount++;
}

function getVideo(uint256 _videoId) public view returns (string memory, string memory, address, uint256) {
Video memory video = videos[_videoId];
return (video.youtubeLink, video.title, video.uploader, video.timestamp);
}
}

3. Deploy the Smart Contract

Use a tool like Remix (Ethereum IDE) or a framework like Truffle or Hardhat to deploy the contract.
Pay the gas fees for deploying the smart contract to the blockchain.

4. Upload a YouTube Link

Once deployed:

Call the uploadVideo function with:
- The YouTube link (e.g., https://youtu.be/dQw4w9WgXcQ).
- A title or description for the video.
The link will be stored on the blockchain, and the transaction ID will serve as proof.

5. Retrieve the Link

Use the getVideo function or a blockchain explorer to retrieve the video link and its associated metadata.
Alternatively, create a frontend application that interacts with the smart contract.

Frontend Integration

To make the process user-friendly:

Build a web interface using React.js or similar frameworks.
Use web3.js or ethers.js to interact with the smart contract.
Provide an input field for users to submit their YouTube links.

Example code snippet for a frontend:

Cost Considerations

Storing a YouTube link is much cheaper than storing an actual video since only the link and metadata are stored on-chain.
For low-cost solutions, use blockchains like Polygon or Solana.

Security and Verification

Hashing: Store a hash of the link or metadata to ensure data integrity.
Ownership Verification: The uploader’s address serves as proof of who submitted the video.

By storing YouTube links on a blockchain, you create an immutable, transparent record of video references, useful for applications like content verification, decentralized repositories, or fundraising platforms.

Step	Description
1	Registration of Outreach Worker (OW) to be able to log onto blockchain
2	Log on of Outreach Worker to Blockchain
3	OW uploads YouTube Link of Child Before
4	OW uploads details of Hospital (indicates area)
5	OW selects Diagnosis from 40
6	Auto Add Date
7	Auto Assign next number – temporary coin
8	Smart contract executed to sit in “investor wait”
9	Sits there for maximum of 32 days before returning to proof of care admin (POC)
10	Registration of Sponsor (Money)
11	Log on of Sponsor to Blockchain
12	Sponsor pays into on ramp fiat to Ethereum or
13	Sponsor pays in acceptable Ethereum
14	Calculation to assess if $1000USD in Sponsor for this coin
15	Date Added
16	Smart contract executed to sit in “diagnosis wait”
17	Sits there for maximum of 32 days before returning to proof of care admin (POC)
18	Registration of Surgeon
19	Log on of Surgeon to Blockchain
20	Surgeon selects Diagnosis from 40
21	Date Added
22	Smart contract executed to sit in “sponsor wait”
23	Sits there for maximum of 32 days before returning to proof of care admin (POC)
24	ETHEREUM Drop = $50USD to Outreach worker Wallet
25	Smart contract executed to sit in “hospital wait”
26	Registration of Hospital
27	Log on of Hospital to Blockchain
28	Date Added
29	Smart contract executed to sit in “surgery wait”
30	Sits there for maximum of 32 days before returning to proof of care admin (POC)
31	Surgeon selects Diagnosis from 40
32	Hospital uploads YouTube Link of Child During
33	Hospital uploads Cloud Link of Child W.H.O. Checklist
34	Smart contract executed to sit in “aftercare wait”
35	Hospital uploads details of Aftercare (indicates area)
36	Hospital uploads details of Aftercare Plus
37	Hospital uploads details of “Home date” (indicates area)
38	Sits there for maximum of 32 days after “Home Date” before returning to proof of care admin (POC)
39	Aftercare uploads YouTube Link of Child After
40	Registration of Hospital
41	Log on of Hospital to Blockchain
42	Date Added
43	Aftercare Plus uploads YouTube Link of Child After
44	ETHEREUM Drop = $50USD to Outreach worker Wallet
45	Outreach uploads Youtube Link of Child home
46	Smart contract executed to sit in “verify wait”
47	Sits there for maximum of 32 days after “Home Date” before returning to proof of care admin (POC)
48	Registration of Verifier
49	Log On
50	AI Video Comparison Approval of Video Outreach, Surgery, Aftercare, Aftercare Plus, Home
51	Date Added
52	If no returns to proof of care admin (POC)
53	Approval
54	Crypto drops to Verify
55	Crypto drops to Surgeon
56	Crypto drops to Hospital
57	Crypto drops to Outreach
58	Crypto drops to Aftercare
59	Crypto drops to Aftercare Plus
60	Crypto drops to Home (Optional)
61	Smart contract executed to for balance of money and number to sit in “adventure investment pool”
62	Smart contract executed for coin to fully mint
63	Smart contract executed for coin to sit on Sponsor Wallet and begin earning

1	pragma solidity ^0.8.0;
2
3	contract ProofOfCareValueChain {
4	// Struct definitions for participants
5	struct OutreachWorker {
6	address wallet;
7	string youtubeLinkBefore;
8	string hospitalDetails;
9	uint8 diagnosis;
10	uint256 registrationDate;
11	}
12
13	struct Sponsor {
14	address wallet;
15	uint256 amountContributed;
16	uint256 registrationDate;
17	}
18
19	struct Surgeon {
20	address wallet;
21	uint8 diagnosis;
22	uint256 registrationDate;
23	}
24
25	struct Hospital {
26	address wallet;
27	string youtubeLinkDuring;
28	string whoChecklistLink;
29	string aftercareDetails;
30	string homeDateDetails;
31	uint256 registrationDate;
32	}
33
34	struct Aftercare {
35	string youtubeLinkAfter;
36	uint256 homeDate;
37	}
38
39	struct Coin {
40	uint256 id;
41	uint8 status; // Tracks the step in the process
42	uint256 createdDate;
43	bool isMinted;
44	}
45
46	// Mappings and state variables
47	mapping(address => OutreachWorker) public outreachWorkers;
48	mapping(address => Sponsor) public sponsors;
49	mapping(address => Surgeon) public surgeons;
50	mapping(address => Hospital) public hospitals;
51	mapping(uint256 => Coin) public coins;
52
53	uint256 public coinCounter;
54	address public proofOfCareAdmin;
55
56	event OutreachWorkerRegistered(address wallet);
57	event SponsorRegistered(address wallet);
58	event SurgeonRegistered(address wallet);
59	event HospitalRegistered(address wallet);
60	event CoinStatusUpdated(uint256 coinId, uint8 status);
61
62	modifier onlyAdmin() {
63	require(msg.sender == proofOfCareAdmin, “Only admin can perform this action”);
64	_;
65	}
66
67	constructor() {
68	proofOfCareAdmin = msg.sender;
69	}
70
71	// Outreach Worker registration
72	function registerOutreachWorker() external {
73	require(outreachWorkers[msg.sender].wallet == address(0), “Already registered”);
74	outreachWorkers[msg.sender] = OutreachWorker(msg.sender, “”, “”, 0, block.timestamp);
75	emit OutreachWorkerRegistered(msg.sender);
76	}
77
78	// Sponsor registration
79	function registerSponsor() external {
80	require(sponsors[msg.sender].wallet == address(0), “Already registered”);
81	sponsors[msg.sender] = Sponsor(msg.sender, 0, block.timestamp);
82	emit SponsorRegistered(msg.sender);
83	}
84
85	// Surgeon registration
86	function registerSurgeon() external {
87	require(surgeons[msg.sender].wallet == address(0), “Already registered”);
88	surgeons[msg.sender] = Surgeon(msg.sender, 0, block.timestamp);
89	emit SurgeonRegistered(msg.sender);
90	}
91
92	// Hospital registration
93	function registerHospital() external {
94	require(hospitals[msg.sender].wallet == address(0), “Already registered”);
95	hospitals[msg.sender] = Hospital(msg.sender, “”, “”, “”, “”, block.timestamp);
96	emit HospitalRegistered(msg.sender);
97	}
98
99	// Outreach Worker uploads YouTube link of child before
100	function uploadYoutubeLinkBefore(string memory _link) external {
101	require(outreachWorkers[msg.sender].wallet != address(0), “Not registered”);
102	outreachWorkers[msg.sender].youtubeLinkBefore = _link;
103	}
104
105	// Outreach Worker uploads hospital details
106	function uploadHospitalDetails(string memory _details) external {
107	require(outreachWorkers[msg.sender].wallet != address(0), “Not registered”);
108	outreachWorkers[msg.sender].hospitalDetails = _details;
109	}
110
111	// Outreach Worker selects diagnosis
112	function selectDiagnosis(uint8 _diagnosis) external {
113	require(outreachWorkers[msg.sender].wallet != address(0), “Not registered”);
114	require(_diagnosis > 0 && _diagnosis <= 40, “Invalid diagnosis”);
115	outreachWorkers[msg.sender].diagnosis = _diagnosis;
116	}
117
118	// Admin creates a new coin and assigns it a temporary ID
119	function createTemporaryCoin() external onlyAdmin {
120	coins[coinCounter] = Coin(coinCounter, 0, block.timestamp, false);
121	coinCounter++;
122	emit CoinStatusUpdated(coinCounter – 1, 0);
123	}
124
125	// Update coin status
126	function updateCoinStatus(uint256 _coinId, uint8 _status) external onlyAdmin {
127	require(coins[_coinId].createdDate > 0, “Coin does not exist”);
128	coins[_coinId].status = _status;
129	emit CoinStatusUpdated(_coinId, _status);
130	}
131
132	// Sponsor contributes to a coin
133	function sponsorContribution(uint256 _amount, uint256 _coinId) external payable {
134	require(sponsors[msg.sender].wallet != address(0), “Not registered”);
135	require(msg.value == _amount, “Incorrect amount sent”);
136	require(coins[_coinId].status == 0, “Coin not in sponsor wait”);
137	sponsors[msg.sender].amountContributed += _amount;
138	if (sponsors[msg.sender].amountContributed >= 1000 ether) {
139	updateCoinStatus(_coinId, 1); // Move to next step
140	}
141	}
142
143	// Hospital uploads surgery details
144	function uploadSurgeryDetails(uint256 _coinId, string memory _youtubeLinkDuring, string memory _whoChecklistLink) external {
145	require(hospitals[msg.sender].wallet != address(0), “Not registered”);
146	require(coins[_coinId].status == 2, “Coin not in surgery wait”);
147	hospitals[msg.sender].youtubeLinkDuring = _youtubeLinkDuring;
148	hospitals[msg.sender].whoChecklistLink = _whoChecklistLink;
149	updateCoinStatus(_coinId, 3); // Move to aftercare wait
150	}
151
152	// Hospital uploads aftercare details
153	function uploadAftercareDetails(uint256 _coinId, string memory _aftercareDetails, string memory _homeDateDetails) external {
154	require(hospitals[msg.sender].wallet != address(0), “Not registered”);
155	require(coins[_coinId].status == 3, “Coin not in aftercare wait”);
156	hospitals[msg.sender].aftercareDetails = _aftercareDetails;
157	hospitals[msg.sender].homeDateDetails = _homeDateDetails;
158	updateCoinStatus(_coinId, 4); // Move to verification
159	}
160
161	// Verifier approves the process
162	function verifyProcess(uint256 _coinId) external onlyAdmin {
163	require(coins[_coinId].status == 4, “Coin not in verification wait”);
164	updateCoinStatus(_coinId, 5); // Approved
165	distributeRewards(_coinId);
166	}
167
168	// Distribute rewards to participants
169	function distributeRewards(uint256 _coinId) internal {
170	require(coins[_coinId].status == 5, “Coin not approved”);
171	// Logic to distribute rewards (e.g., ETH) to Outreach Worker, Hospital, etc.
172	// Placeholder for reward distribution
173	}
174
175	// Mint final coin to sponsor wallet
176	function mintCoinToSponsor(uint256 _coinId, address _sponsor) external onlyAdmin {
177	require(coins[_coinId].isMinted == false, “Coin already minted”);
178	require(coins[_coinId].status == 5, “Coin not ready for minting”);
179	coins[_coinId].isMinted = true;
180	// Logic to transfer ownership to sponsor’s wallet (if integrated with ERC-20/ERC-721)
181	}
182
183	// Fallback function to receive Ethereum
184	receive() external payable {}
185	}