Proof of Interaction .

# 🧾 Interaction Logger Smart Contract

This project implements a minimal Solidity smart contract that logs user interactions along with timestamps — without constructors, imports, or input parameters.

It demonstrates a simple and gas-efficient way to record and retrieve interaction history on-chain.

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## 🚀 Overview

- Purpose: Record when users interact with the contract.

- Functionality:

- Log each interaction with msg.sender and block.timestamp

- Emit an event for each interaction

- Retrieve total count, latest interaction, or all interactions

- Design Constraints:

- No constructors

- No import statements

- No input fields or function parameters

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## 🧱 Technology Stack

- Language: Solidity ^0.8.20

- Blockchain: [Flow Testnet](https://testnet.flowscan.io/)

- Contract Type: Logging / Event-based Storage

> 💡 Although written in Solidity, this implementation is deployed on the Flow-compatible EVM environment.

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## 📜 Contract Details

| Item | Description |

|------|--------------|

| Contract Name | InteractionLogger |

| Deployed Network | Flow Testnet |

| Testnet Address | 0x17B605e8BCc60eC02055d3695a0D7f5553B50714 |

| Deployed/Used Contracts | InteractionLogger |

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## 🧩 Key Functions

| Function | Description | Inputs | Returns |

|-----------|--------------|---------|----------|

| logInteraction() | Records a new interaction with timestamp | None | id (uint256) |

| totalInteractions() | Returns total number of interactions logged | None | count (uint256) |

| latestInteraction() | Returns details of the most recent interaction | None | (address, uint256, uint256) |

| getAllInteractions() | Returns arrays of all users, timestamps, and IDs | None | Multiple arrays |

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## 🪶 Events

```solidity

event InteractionLogged(address indexed user, uint256 timestamp, uint256 indexed id);