initial commit

.gitignore

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+.idea/
+node_modules/
+build/

contracts/AutismRegistrar.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract AutismRegistrar {
+    mapping(address => uint) public nonces;
+
+    event RecordUpdatedFor(address indexed account, bytes value, bytes proof, address relayer);
+
+    function updateFor(address account, bytes calldata value, bytes calldata proof) public {
+        uint nonce = nonces[account];
+        bytes32 msgHash = keccak256(abi.encodePacked(account, value, nonce));
+        bytes32 signedMsgHash = getEthSignedMessageHash(msgHash);
+
+        require(recoverSigner(signedMsgHash, proof) == account);
+
+        nonces[account] = nonce + 1;
+
+        emit RecordUpdatedFor(account, value, proof, msg.sender);
+    }
+
+    function recoverSigner(bytes32 msgHash, bytes memory proof) public pure returns (address) {
+        (bytes32 r, bytes32 s, uint8 v) = splitSignature(proof);
+        return ecrecover(msgHash, v, r, s);
+    }
+
+    function splitSignature(bytes memory sig) public pure returns (
+        bytes32 r,
+        bytes32 s,
+        uint8 v
+    ) {
+        require(sig.length == 65, "invalid signature length");
+
+        assembly {
+        /*
+        First 32 bytes stores the length of the signature
+
+        add(sig, 32) = pointer of sig + 32
+        effectively, skips first 32 bytes of signature
+
+        mload(p) loads next 32 bytes starting at the memory address p into memory
+        */
+
+        // first 32 bytes, after the length prefix
+            r := mload(add(sig, 32))
+        // second 32 bytes
+            s := mload(add(sig, 64))
+        // final byte (first byte of the next 32 bytes)
+            v := byte(0, mload(add(sig, 96)))
+        }
+
+        // implicitly return (r, s, v)
+    }
+
+    function getEthSignedMessageHash(bytes32 _messageHash) public pure returns (bytes32){
+        return
+        keccak256(
+            abi.encodePacked("\x19Ethereum Signed Message:\n32", _messageHash)
+        );
+    }
+}

migrations/1_initial_migration.js

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+const Migrations = artifacts.require("AutismRegistrar");
+
+module.exports = function (deployer) {
+    deployer.deploy(Migrations, {
+        // from: "0x5d432ce201d2c03234e314d4703559102Ebf365C",
+        from: "0x860C68abeEE0ecBd97729C7d1E09dA1e7EaD3C50",
+    });
+};

package.json

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+{
+  "name": "contracts",
+  "version": "1.0.0",
+  "description": "",
+  "main": "truffle-config.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "@truffle/hdwallet-provider": "^1.2.6",
+    "truffle-hdwallet-provider": "^1.0.17"
+  },
+  "author": "",
+  "license": "ISC"
+}

truffle-config.js

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+/**
+ * Use this file to configure your truffle project. It's seeded with some
+ * common settings for different networks and features like migrations,
+ * compilation and testing. Uncomment the ones you need or modify
+ * them to suit your project as necessary.
+ *
+ * More information about configuration can be found at:
+ *
+ * trufflesuite.com/docs/advanced/configuration
+ *
+ * To deploy via Infura you'll need a wallet provider (like @truffle/hdwallet-provider)
+ * to sign your transactions before they're sent to a remote public node. Infura accounts
+ * are available for free at: infura.io/register.
+ *
+ * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
+ * public/private key pairs. If you're publishing your code to GitHub make sure you load this
+ * phrase from a file you've .gitignored so it doesn't accidentally become public.
+ *
+ */
+
+const HDWalletProvider = require('@truffle/hdwallet-provider');
+//
+// const fs = require('fs');
+// const mnemonic = fs.readFileSync(".secret").toString().trim();
+console.log(process.env.PRIVATE_KEY);
+module.exports = {
+    /**
+     * Networks define how you connect to your ethereum client and let you set the
+     * defaults web3 uses to send transactions. If you don't specify one truffle
+     * will spin up a development blockchain for you on port 9545 when you
+     * run `develop` or `test`. You can ask a truffle command to use a specific
+     * network from the command line, e.g
+     *
+     * $ truffle test --network <network-name>
+     */
+
+    networks: {
+        // Useful for testing. The `development` name is special - truffle uses it by default
+        // if it's defined here and no other network is specified at the command line.
+        // You should run a client (like ganache-cli, geth or parity) in a separate terminal
+        // tab if you use this network and you must also set the `host`, `port` and `network_id`
+        // options below to some value.
+        //
+        development: {
+            host: "127.0.0.1",     // Localhost (default: none)
+            port: 8545,            // Standard Ethereum port (default: none)
+            network_id: "*",       // Any network (default: none)
+        },
+        // Another network with more advanced options...
+        // advanced: {
+        // port: 8777,             // Custom port
+        // network_id: 1342,       // Custom network
+        // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
+        // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
+        // from: <address>,        // Account to send txs from (default: accounts[0])
+        // websocket: true        // Enable EventEmitter interface for web3 (default: false)
+        // },
+
+        arbitrum: {
+            provider: function() {
+                return new HDWalletProvider(
+                    // throw-away seed for dev
+                    process.env.PRIVATE_KEY,
+                    `https://arbitrum-mainnet.infura.io/v3/28e5737b9034453d877f39dcf3f297b9`
+                );
+            },
+            network_id: 42161,
+            networkCheckTimeout: 1000000,
+            timeoutBlocks: 200
+        },
+
+        arbitrum_rinkeby: {
+            provider: function() {
+                return new HDWalletProvider(
+                    // throw-away seed for dev
+                    'maid side truck wood tuition engine onion extra frozen garbage car eager',
+                    `https://arbitrum-rinkeby.infura.io/v3/28e5737b9034453d877f39dcf3f297b9`
+                );
+            },
+            network_id: 421611,
+            networkCheckTimeout: 10000000,
+            timeoutBlocks: 200
+        },
+        // Useful for deploying to a public network.
+        // NB: It's important to wrap the provider as a function.
+        // ropsten: {
+        // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
+        // network_id: 3,       // Ropsten's id
+        // gas: 5500000,        // Ropsten has a lower block limit than mainnet
+        // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
+        // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+        // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+        // },
+        // Useful for private networks
+        // private: {
+        // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
+        // network_id: 2111,   // This network is yours, in the cloud.
+        // production: true    // Treats this network as if it was a public net. (default: false)
+        // }
+    },
+
+    // Set default mocha options here, use special reporters etc.
+    mocha: {
+        // timeout: 100000
+    },
+
+    // Configure your compilers
+    compilers: {
+        solc: {
+            version: "0.8.3",    // Fetch exact version from solc-bin (default: truffle's version)
+            docker: false,        // Use "0.5.1" you've installed locally with docker (default: false)
+            // settings: {          // See the solidity docs for advice about optimization and evmVersion
+            //  optimizer: {
+            //    enabled: false,
+            //    runs: 200
+            //  },
+            //  evmVersion: "byzantium"
+            // }
+        }
+    },
+
+    // Truffle DB is currently disabled by default; to enable it, change enabled: false to enabled: true
+    //
+    // Note: if you migrated your contracts prior to enabling this field in your Truffle project and want
+    // those previously migrated contracts available in the .db directory, you will need to run the following:
+    // $ truffle migrate --reset --compile-all
+
+    db: {
+        enabled: false
+    }
+};