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Following
DOGE 
LTC A shared codebase with security issues
Dogcoin's codebase can be traced directly to Litecoin. Dogcoin was launched in December 2013 as a fork project for Litecoin, which means that both cryptocurrencies rely on the same hash function: Srypt.
This shared foundation brought early vulnerabilities. Before August 2014, Dogcoin and Litecoin competed for the same batch of Srypt miners. The miners would switch between the two networks based on short-term gains, causing the hash rate of Dogcoin to fluctuate sharply. At that time, due to its relatively low hash rate, Dogecoin faced concerns of being attacked by 51%.
In 2014, the Dogcoin development team and community decided to switch to the Auxiliary Proof of Work (AuxPoW) algorithm to maintain network security by relying on the mining power of Litecoin. The upgrade was activated in September 2014 at block height 371,337 and is a mandatory upgrade. Nodes that do not adopt this change will no longer be able to send or receive dogcoins.
The actual operation of merged mining
Protocol modifications allow Dogecoin to regard mining work originally performed for Litecoin as a valid proof of workload, allowing the two cryptocurrencies to share the same hash power. The Litecoin block header is embedded with an encryption promise for the dogcoin block header, which proves that the same hash work can meet the proof-of-work requirements of both networks.
The key is that the two chains maintain separate ledgers and implement their own rules, sharing only mining work. This arrangement has had an immediate effect on the security of dogcoin.
Within one month after the change, as the large mining pool expanded its operations, the hash rate and mining difficulty of Dogecoin increased by more than 1500%. Since then, the hash rate of dogcoin and the hash rate of litecoin have shown a strong positive correlation.
Direct benefits to miners
Litecoin miners can now obtain additional cryptocurrency while providing the same computing power. Today, more than 70% of Dogcoin's hash rate comes from merged mining with Litecoin, which has become the absolute mainstream way to ensure Dogcoin's network security.
Billy Marcus, one of the founders of Dogcoin, once said that the decision to merge mining with Litecoin not only saved Dogcoin, but was also the most important version update in the history of Dogcoin development team.
Ongoing controversy
This structure is not without controversy. The focus of recent debate in the development community is whether dogcoin's security relies exclusively on Litecoin or whether it comes from all Srypt-based one-layer chains that use merged mining. There is no consensus yet to be reached on changing the existing structure.
