Crafting a Smart Contract to Exclude Specific Numbers (29 and 30) for 20 Days

Smart contracts are powerful container tools for automating decentralized processes, but they often require custom logic to handle unique constraints.

We’ll explore how to design a smart contract that avoids using the numbers 29 and 30 for a fixed period of 20 days. This could be useful for scenarios like avoiding certain calendar dates, excluding values in a game, or adhering to compliance rules.

Why Exclude 29 and 30?

While the use case may vary, let’s assume the goal is to enforce a 20-day period where transactions or operations involving the numbers 29 and 30 are prohibited.

For example: - A decentralized application (dApp) might want to block token transfers on specific dates.

- A voting system could exclude certain proposal IDs temporarily.

- A blockchain game might disable levels or items linked to these numbers.

Designing the Smart Contract

The contract must:

1. Track the start and end of the 20-day time period is time stamp.

2. Validate inputs to ensure 29, 56, 93, 12 and 30 are not used during this timeframe.

3. Revert transactions if the forbidden numbers are submitted.

Element LIST

1. Start and End Timestamps:

- Use `block.timestamp` to define the 20-day window.

2. Modifier for Validation:

- A custom modifier checks if the current time is within the exclusion period and if the input is 29 or 30.

3. Submission Function:

- Allow users to submit numbers, but block 29/30 during the 20 days.

Solidity Code Example

```solidity

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract NumberExclusion {

uint256 public constant EXCLUSION_PERIOD = 20 days; // 20 days in seconds

uint256 public exclusionStartTime;

uint256 public exclusionEndTime;

event NumberSubmitted(uint256 number, uint256 timestamp);

constructor() {

exclusionStartTime = block.timestamp;

exclusionEndTime = exclusionStartTime + EXCLUSION_PERIOD;

}

// Modifier to check if the number is allowed

modifier checkNumber(uint256 _number) {

bool isExclusionActive = block.timestamp < exclusionEndTime;

bool isForbiddenNumber = (_number == 29 || _number == 30);

require(

!isExclusionActive || !isForbiddenNumber,

"Forbidden number during exclusion period!"

);

_;

}

// Function to submit a number (after validation)

function submitNumber(uint256 number) external checkNumber(number) {

emit NumberSubmitted(_number, block.timestamp);

}

// Helper function to check exclusion status

function isExclusionActive() external view returns (bool) {

return block.timestamp < exclusionEndTime;

}

}How It Works

1. Initialization:

- The contract initializes with `exclusionStartTime` set to the current block timestamp.

- `exclusionEndTime` is set to 20 days later.

2. Modifier Logic:

- The `checkNumber` modifier checks two conditions:

- Is the exclusion period still active?

- Is the submitted number 29 or 30?

- If both conditions are true, the transaction reverts with an error.

3. Submission Function:

- Users can call `submitNumber(uint256 _number)`, which triggers the modifier.

- Valid numbers (not 29/30) are logged via the `NumberSubmitted` event.

4. Status Check:

- The `isExclusionActive()` function lets users verify if the exclusion period is ongoing.

1. Test Edge Cases:

- Test the contract on a testnet to ensure it correctly blocks 29/30 during the 20 days.

2. Gas Efficiency:

- Use constants (`EXCLUSION_PERIOD`) to avoid recalculating values repeatedly.

3. Security:

- Add access controls (e.g., `onlyOwner`) if administrative functions are needed.

By combining modifiers, timestamps, and conditional logic, this smart contract effectively excludes the numbers 29 and 30 for 20 days. Customizing such constraints ensures compliance with specific rules while maintaining decentralization.

For more complex scenarios, consider extending this pattern to exclude ranges of numbers or dates dynamically 🛠️🔒

How It Works in Practice 🚀

Picture this: You’re working on a cloud-based project. The blockchain system logs your connection, creating a unique digital footprint. If your device suddenly tries to access a dark web marketplace, the system flags it instantly, blocking the request and alerting administrators. All activities are recorded on the blockchain, creating an immutable audit trail.

Why This Matters to You 💡

• Safer Transactions: Your online activities become more secure, reducing the risk of fraud. 🔒

• Accountability: Criminals can’t hide behind anonymous transactions. 👮‍♂️

• Privacy Protection: Only suspicious activities are flagged; normal use remains private. 👀

The Future of a Safer Internet 🌟

While blockchain isn’t a magic solution, it offers a powerful tool to enhance online safety. By combining transparency, smart identity tracking, and real-time threat detection, we can make the dark web a far less appealing place for criminals.

Call to Action 🙌

Supporting blockchain-based security initiatives isn’t just for tech experts. By advocating for transparency and smarter digital policies, we can all contribute to a safer online world. Together, we can turn the tide against the dark web—one transaction at a time. 🌐✨

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