Based on the Bitcoin protocol, the blockchain database is shared by all nodes participating in a system. Upon joining the network, each connected computer receives a copy of the blockchain, which has records, and stands as proof of, every transaction ever executed.
Tyrion Lannister's shield during the battle on the Green Fork is a massive slab of heavy ironwood banded with steel. In Game of Thrones - A Telltale Games Series, House Forrester controls most of the wolfswood's ironwoods. Their seat, Ironrath, is located at the edge of the largest ironwood forest in Westeros.
Arkngthand is a large Dwemer Ruin found in The Elder Scrolls III: Morrowind. It is located in the Molag Amur region, on the island of Vvardenfell. The towers of the ruins can be seen above ground, but most of the maze-like structure is underground.