# Ultimate Go Episode 16: Adding Transaction Validation and Security to a Blockchain

DevFeed: [Ultimate Go Episode 16: Adding Transaction Validation and Security to a Blockchain](<https://devfeed.tech/articles/ultimate-go-advanced-engineering-episode-16-22205.md>)

Original publisher: [Read original article](<https://www.ardanlabs.com/blog/2023/01/ultimate-go-advanced-engineering-episode-16.html>)

Published: 2023-01-17T00:00:00Z

Content type: tutorial

Language: en

Sources: [William Kennedy](<https://devfeed.tech/sources/william-kennedy.md>)

Topics: [Blockchain](<https://devfeed.tech/topics/blockchain.md>), [Security](<https://devfeed.tech/topics/security.md>), [Go Language](<https://devfeed.tech/topics/go-language.md>)

Tags: [bitcoin](<https://devfeed.tech/tags/bitcoin.md>), [blockchain](<https://devfeed.tech/tags/blockchain.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [go](<https://devfeed.tech/tags/go.md>), [go-blockchain](<https://devfeed.tech/tags/go-blockchain.md>), [iam](<https://devfeed.tech/tags/iam.md>), [identity](<https://devfeed.tech/tags/identity.md>), [identity-management](<https://devfeed.tech/tags/identity-management.md>), [learn](<https://devfeed.tech/tags/learn.md>), [private-key](<https://devfeed.tech/tags/private-key.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [public-address](<https://devfeed.tech/tags/public-address.md>), [secure-blockchain](<https://devfeed.tech/tags/secure-blockchain.md>), [security](<https://devfeed.tech/tags/security.md>), [validation](<https://devfeed.tech/tags/validation.md>), [verification](<https://devfeed.tech/tags/verification.md>)

## AI overview

This video explains how to add validation mechanisms to blockchain nodes. It covers checking a transaction's destination, verifying signature rules defined by the protocol, and calculating a user's address from a transaction signature.

## Source excerpt

Introduction In episode 15, Bill architected a solution to ensure all the users on his blockchain were given a unique identifier. His approach consisted of essentially leveraging the randomness of a user's private key to ensure each identifier is unique. A disadvantage Bill pointed out with this is that a user may forget their private key and ultimately lose access to their account. To circumvent this issue, Bill proposed the usage of a mnemonic, that is composed of 12 to 24 words, to act as the private key since it's simpler to keep track of and hard to guess.