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| name: "Install dependencies" | |
| description: "Prepare repository and all dependencies" | |
| inputs: | |
| node-version: | |
| description: "The node version to use" | |
| required: false | |
| default: "20" | |
| package-manager: | |
| description: "You may specify your preferred package manager (one of `npm | yarn | pnpm | bun` and an optional `@<version>` tag). Otherwise, the package manager will be automatically detected." | |
| required: false |
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| Year | Number of Crypto Users | |
|---|---|---|
| 2009 | 1000 | |
| 2010 | 5000 | |
| 2011 | 20000 | |
| 2012 | 100000 | |
| 2013 | 1000000 | |
| 2014 | 2000000 | |
| 2015 | 5000000 | |
| 2016 | 10000000 | |
| 2017 | 35000000 |
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.0; | |
| import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; | |
| import "@openzeppelin/contracts/interfaces/IERC20.sol"; | |
| contract SubscriptionNFT is ERC721 { | |
| IERC20 public usdcToken; | |
| address public owner; |
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