Multiblockchain appear, when every app using its own blockchain...
This is called the third generation blockchain. In this case, it is possible to exchange data between different blockchains. For example, Cardano.
The project began in 2015.
...The speed of transactions became very big...
There are projects with increasing transaction speed with increasing load. For example, IOTA (tangle).
The project began in 2015.
...Different kind of PoS mining - DPoS (with delegated masternodes) LPoS with leasing of tokens and so on...
Different types of mining (D)POS, HDD/SSD, mobile and others were invented before the end of 2017.
...There are a lot of changes and developments in blockchain. May be blockchain develops not so quickly like we want but it develops.
So what's new in blockchain technology in 2019?
Optherium is now paying close attention to working with corporate clients and creating products for them. All about our developments you can find on our site