Bump werkzeug from 0.12.2 to 0.15.3 in /lang/python/json-rpc

blockchain/bitcoin/brainwallet.py

@@ -1,4 +1,5 @@
 #coding:utf-8
+#!/usr/bin/env python
 import sys
 from getpass import getpass
 from bitcoin import *

blockchain/crypto/readme.md

@@ -4,6 +4,12 @@
 
 ## ecdsa
 
+install
+```
+$ pip3 install ecdsa
+```
+
+
 ## Steganography
 
 install 7z on macosx.

blockchain/ethereum/hardhat_sample/.gitignore

@@ -0,0 +1,12 @@
+node_modules
+
+#Hardhat files
+cache
+artifacts
+
+#secret keys
+.secrets.json
+
+#temp files
+.*~
+

blockchain/ethereum/hardhat_sample/contracts/CryptoScientists.sol

@@ -0,0 +1,54 @@
+//SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+
+contract CryptoScientists is ERC721 {
+    uint256 public token_count = 0; // total count of token
+
+    address _minter;
+    mapping(uint256 => string) _token_hash; // ipfs hash for token[id]
+    mapping(string => bool) _hash_exists;
+
+    modifier onlyMinter {
+        require(_minter == msg.sender, "not minter");
+        _;
+    }
+
+    constructor() ERC721("Crypto Scientists NFT", "CSNFT") {
+        _minter = msg.sender;
+    }
+
+    function changeMinter(address m) public onlyMinter {
+        _minter = m;
+    }
+
+    function mint(string memory hash) public onlyMinter returns (uint256) {
+        require(_hash_exists[hash] == false, "already minted");
+        _hash_exists[hash] = true;
+
+        uint256 id = token_count;
+        token_count += 1;
+
+        _token_hash[id] = hash;
+        _safeMint(msg.sender, id);
+
+        return id;
+    }
+
+    function _baseURI() internal pure override returns (string memory) {
+        return "ipfs://ipfs/";
+    }
+
+    function tokenURI(uint256 tokenId) public view override returns (string memory) {
+        require(_exists(tokenId), "nonexistent token");
+
+        string memory baseURI = _baseURI();
+        return bytes(baseURI).length > 0
+            ? string(abi.encodePacked(baseURI, _token_hash[tokenId]))
+            : '';
+    }
+
+
+
+}

blockchain/ethereum/hardhat_sample/hardhat.config.js

@@ -0,0 +1,48 @@
+require("@nomiclabs/hardhat-waffle");
+require("@nomiclabs/hardhat-web3");
+require("@nomiclabs/hardhat-etherscan");
+
+//.secrets format: { "privkey":"....", "alchemyapikey":"...." }
+const { privkey, alchemy_apikey, etherscan_apikey } = require("./.secrets.json");
+
+// This is a sample Hardhat task. To learn how to create your own go to
+// https://hardhat.org/guides/create-task.html
+task("accounts", "Prints the list of accounts", async () => {
+  const accounts = await ethers.getSigners();
+
+  for (const account of accounts) {
+    console.log(account.address);
+  }
+});
+
+// Added by Evan
+task("balance", "Prints an account's balance [Evan's]")
+	.addParam("account", "The account's address")
+	.setAction(async taskArgs => {
+		const account = web3.utils.toChecksumAddress(taskArgs.account);
+		const balance = await web3.eth.getBalance(account);
+
+		console.log(web3.utils.fromWei(balance, "ether"), "ETH");
+	});
+
+// You need to export an object to set up your config
+// Go to https://hardhat.org/config/ to learn more
+
+/**
+ * @type import('hardhat/config').HardhatUserConfig
+ */
+module.exports = {
+  //solidity: "0.7.3",
+  solidity: "0.8.0",
+	networks: {
+		rinkeby: {
+			url: `https://eth-rinkeby.alchemyapi.io/v2/${alchemy_apikey}`,
+			accounts: [`0x${privkey}`]
+		}
+	},
+	etherscan: {
+		apiKey: etherscan_apikey
+	}
+
+};
+