Introduction In episode 13, Bill discussed the idea of adding salt to a hash and how modern crypto-currency blockchains use it to better interpret requests sent to nodes. He continued by defining a function called stamp that embeds a salt within a hash. While writing the function, Bill stated that he would use keccak256 as it’s the same algorithm used by Ethereum to generate hash values. Bill will use the APIs provided with Go Ethereum to generate a keccak256 hash.

Introduction In episode 12, Bill laid out his strategy to handle data hashing on his blockchain. The first step he took was to create a package to handle the cryptographical aspects of his blockchain. After that, he wrote a hash function that met the requirements outlined in his strategy. This function took transaction data as a parameter and returned a hexadecimal representation of the hash. To implement this function, Bill imported packages from the Go standard library and Ethereum API.

Introduction In episode 11, Bill highlighted the issue of identity verification and provided a solution to this problem. The solution proposed was to cryptographically sign a transaction to verify its authenticity. Bill chose to implement a solution making use of the Elliptic Curve Digital Signature Algorithm (ECDSA) as the public key can be extracted from a signature. Although a small distinction, the ability to re-compute a public key is essential in a decentralized and distributed environment.

Introduction In episode 10, Bill dove into the technical implementation of his genesis record and defined a custom Go type representing the record. While doing so, he provided an in-depth look at the reasoning behind the fields he included.. After declaring this type, Bill wrote a function that loads the genesis record from disk and onto memory. His function will use the standard library encoding/json package to load JSON data from a hard-coded file path.

Introduction In episode 9, Bill introduced the idea of the genesis record and its role in his blockchain. As a recap, the genesis record will be used to customize the settings of his blockchain. The approach Bill takes here is similar to how Ethereum operates because he is storing the record in JSON format. In this video, Bill starts by defining the Go types his blockchain will use. The first type he defines will represent the genesis record.

Introduction I made it my mission in 2022 to learn everything I could about blockchain and as the year ends, I feel like I accomplished my goal. Love it, hate it, or don’t want to know nothing about it, I think it’s important to push your opinions aside and understand how this technology works. Even with the current collapse of several large crypto companies in 2022, blockchain isn’t going to disappear.

Introduction In episode 8, Bill wanted to build a blockchain in Go and began to lay the groundwork for the project. Go is a good choice because its standard library has the necessary network and cryptographical functionality required to build a blockchain. Unlike the previous segment, Bill plans to use this blockchain to manage accounts and balances with hypothetical assets. Bill will reuse concepts from ethereum, bitcoin and the previous segment of the series to implement this blockchain.

Introduction In the first part of the series, Bill designed a dependency management system. The dependency manager needed to be distributed, transparent, cryptographically auditable and scalable. To meet these requirements, Bill borrowed concepts from blockchain. He did this to illustrate how the blockchain can be repurposed and used to accomplish the mundane task of dependency management. While doing so, Bill indirectly highlighted the problems a blockchain solves. In the next segment of the series, Bill will build a semantically correct blockchain.

Introduction In episode 6, Bill gives an overview of what consensus algorithms are and how these algorithms ensure distributed databases are in sync. Moving forward Bill will adopt the proof of authority (PoA) algorithm as a means to determine which node has the ability to write the next record. To jog your memory, PoA is a consensus mechanism where identity is used as a stake. By implementing this algorithm, Bill will add transparency to his dependency manager as he is no longer the only user with the ability to add new records.

Introduction Most apps that work with time values eventually need to display time to a user. Go has a unique way of allowing you to specify how to display time values that is different from the C library function strftime. The strftime function tends to be the standard for languages and tooling to format time. Go developed its own format specification instead of using any existing format with the idea of being able to maintain a mental model for formatting time.