The Scrypt mining algorithm appeared back in 2011 along with the Litecoin cryptocurrency, which was the main alternative to Bitcoin at that time. Litecoin was initially mined, like Bitcoin at that time, on video cards until 2014, when the first ASIC Miner for the Scrypt algorithm from Zeus Miner appeared. Several models were presented at once from 1.2MH/s to 72Mh/s, but all had the same chips with an energy efficiency of 13 J/Mh. The next stage in the development of mining using the Scrypt algorithm came in 2015, when, against the background of a protracted crypto crisis and a sharp loss of interest in cryptocurrencies. The creators of Dogecoin and Litecoin combine their networks using AUXPOW (Auxiliary Proof-of-Work) technology, when the Litecoin network was used as a proof of work (POW) for the DOGE cryptocurrency. In other words, the manners of Scrypt asics began to receive two cryptocurrencies LTC and DOGE at once.

Which actually saved Dogecoin from a 51% attack in 2015-2016 and the complete closure of the project, since even the DOGE developers themselves did not believe in the success of Dogecoin and actually abandoned its further development after this transition.

In 2015, no one could have imagined that in fact Doge coin would not just stay afloat, but would even surpass its ancestor Litecoin in popularity and value. And the share of income in DOGE from LTC+DOGE dual mining will be more than 90%. That is, in fact, at the time of 2024, Litecoin and Doge switched roles, when Doge already saves Litecoin from an attack of 51%.

In 2024, another trend in cryptocurrency mining appeared, when the developers of new cryptocurrencies remembered about AUXPOW technology. So this year, the Bells cryptocurrency appeared, using AUXPOW and the Litecoin network for its own POW mining.  That is, in 2024, instead of the LTC+DOGE mining barrel, triple mining LTC+ DOGE + Bells began to be used, which also increases the income from mining and the payback of Scrypt asics. 

Just recently, at the end of 2024, two more cryptocurrencies Luckycoin (LKY) and Pepecoin (PEP) switched to AUXPOW.

Luckycoin is an old cryptocurrency originally from 2013, which was decided to be revived in this way in 2024. The site even claims that the creators of Dogecoin used their code, not Litecoin, as the basis for creating their first cryptocurrency meme. 

Thus, the owners of Scrypt asics can mine 5 cryptocurrencies at once: LTC+ DOGE+ Bells+LKY+PEP.

It is already possible to mine 5 cryptocurrencies using the Scrypt mining algorithm at the same time on the ViaBTC pool.

But that's not all, because soon the Junkcoin cryptocurrency will be launched on the same principle, and another project with AUXPOW - Rabbit is planned for March 2025.

And it is quite possible that this is not a complete list of cryptocurrencies available for simultaneous mining on the Scrypt algorithm and soon we will hear about new projects with AUXPOW for the Scrypt algorithm.

Conclusion: Considering the payback of ASIC on the Scrypt algorithm for only one Litecoin cryptocurrency in 2024 is the wrong decision, since 90% of the profit is given in dual mining by the DOGE cryptocurrency. By adding 3 more cryptocurrencies already available for simultaneous mining, you will receive an additional profit of 5-10% than from LTC+DOGE dual mining. Moreover, this will not require any additional costs.