Joshy Orndorff JoshOrndorff

This document contains corrections to mistakes in the UTXO wallet assignmetn for PBA's Hong Kong cohort.

Incorrect comment about input and output value

The doc comments on the transaction type incorrectly state that the output value should exceed the input value. This is exactly backwards. Luckily this is only a comment mistake, the tests are correct and this should not affect your programmin experience at all.

/// A Bonecoin Transaction

Joshy's reflections on the Blockchain and Smart Contracts hybrid module as delivered during week 2 of PBA3 in Berkeley 2023.

Content Sequencing and Hybrid Module Approach

For the UCB cohort we largely re-wrote the smart contracts module, moving away from a narrow focus on ink! to a much broader perspective across the blockchain space and historically. We also integrated this content tightly with the existing blockchain module to create a week-long hybrid module. The motivation is that the idea of a smart contract predates blockchain and was a goal well before it was realized on blockchains.

I think this ordering makes a lot of sense and should be kept. However, I think the idea of one massive module can be improved upon. Thank you Nuke and Pauline for the opportunity to teach it as a monolith until the proper delineations became clear.

UCB Content Order - Reminder

Grandpa - The Board Game

Players: 5+ (4 actual players, 1 author)
Play time: 15 - 60 min
Materials: A large whiteboard and many colored markers

Overview

Grandpa is a Byzantine fault tolerant blockchain finality gadget (formal spec). This collaborative board game allows players to learn and practice the Grandpa protocol while also having fun together.

	// SPDX-License-Identifier: GPL-3.0-only
	pragma solidity >=0.8.0;

	contract Incrementor {
	uint private value;
	address private last_caller;

	function inc() public {
	value += 1;
	last_caller = msg.sender;

	$ curl <endpoint> -H "Content-Type:application/json;charset=utf-8" -d '{
	"jsonrpc":"2.0",
	"id":1,
	"method":"author_removeExtrinsic",
	"params": ["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

	$ ./target/release/polkadot --chain rococo-local-cfde-real-overseer.json --alice --tmp --discover-local
	2020-11-18 10:09:03 Parity Polkadot
	2020-11-18 10:09:03 ✌️ version 0.8.26-cfde0767-x86_64-linux-gnu
	2020-11-18 10:09:03 ❤️ by Parity Technologies <[email protected]>, 2017-2020
	2020-11-18 10:09:03 📋 Chain specification: Rococo Local Testnet
	2020-11-18 10:09:03 🏷 Node name: Alice
	2020-11-18 10:09:03 👤 Role: AUTHORITY
	2020-11-18 10:09:03 💾 Database: RocksDb at /tmp/substrateytfeEs/chains/rococo_local_testnet/db
	2020-11-18 10:09:03 ⛓ Native runtime: rococo-10 (parity-rococo-v1-0.tx0.au0)
	2020-11-18 10:09:05 🔨 Initializing Genesis block/state (state: 0x10aa…7cc8, header-hash: 0x7488…9bca)

	joshy@pop-os:~/ProgrammingProjects/substrate-node-template$ ./target/release/node-template --chain local --alice --base-path /tmp/alice --force-authoring -ltxpool=trace
	2020-09-09 11:27:10.617 main INFO sc_cli::runner Substrate Node
	2020-09-09 11:27:10.617 main INFO sc_cli::runner ✌️ version 2.0.0-rc6-fcd577e-x86_64-linux-gnu
	2020-09-09 11:27:10.617 main INFO sc_cli::runner ❤️ by Substrate DevHub <https://github.com/substrate-developer-hub>, 2017-2020
	2020-09-09 11:27:10.617 main INFO sc_cli::runner 📋 Chain specification: Local Testnet
	2020-09-09 11:27:10.617 main INFO sc_cli::runner 🏷 Node name: Alice
	2020-09-09 11:27:10.617 main INFO sc_cli::runner 👤 Role: AUTHORITY
	2020-09-09 11:27:10.617 main INFO sc_cli::runner 💾 Database: RocksDb at /tmp/alice/chains/local_testnet/db
	2020-09-09 11:27:10.617 main INFO sc_cli::runner ⛓ Native runtime: node-template-1 (node-template-1.tx1.au1)
	2020-09-09 11:27:10.718 main INFO sc_service::client::client 🔨 Initializing Genesis block/state (state: 0x6325…a0b3, h

	$ cargo build --release -p rococo-collator
	Downloaded crypto-mac v0.8.0
	Downloaded block-buffer v0.9.0
	Downloaded opaque-debug v0.3.0
	Downloaded aes v0.4.0
	Downloaded generic-array v0.14.3
	Downloaded ghash v0.3.0
	Downloaded digest v0.9.0
	Downloaded cpuid-bool v0.1.2
	Downloaded stream-cipher v0.4.1

	$ cargo check
	Compiling utxo-workshop v2.0.0-alpha.5 (/home/joshy/ProgrammingProjects/utxo-workshop/node)
	Checking utxo-runtime v2.0.0-alpha.6 (/home/joshy/ProgrammingProjects/utxo-workshop/runtime)
	Checking sha3pow v2.0.0-alpha.6 (/home/joshy/ProgrammingProjects/utxo-workshop/node/sha3pow)

	error[E0599]: no method named `build` found for struct `sc_service::builder::ServiceBuilder<sp_runtime::generic::block::Block<sp_runtime::generic::header::Header<u32, sp_runtime::traits::BlakeTwo256>, sp_runtime::OpaqueExtrinsic>, utxo_runtime::RuntimeApi, sc_client::client::Client<sc_client_db::Backend<sp_runtime::generic::block::Block<sp_runtime::generic::header::Header<u32, sp_runtime::traits::BlakeTwo256>, sp_runtime::OpaqueExtrinsic>>, sc_client::call_executor::LocalCallExecutor<sc_client_db::Backend<sp_runtime::generic::block::Block<sp_runtime::generic::header::Header<u32, sp_runtime::traits::BlakeTwo256>, sp_runtime::OpaqueExtrinsic>>, sc_executor::native_executor::NativeExecutor<service::Executor>>, sp_