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Paintings on walls and ceilings were often a feature of caves inhabited by monks. Although there are none at Ritigala, or, if there were, they have long since disappeared,

1. New Track of Filecoin Mining With the advent of the era of 5G, the Internet of things and big data, human data is growing rapidly at the rate of doubling every 18 months. The need to store these data, remove duplicate data and search has become increasingly important. A large market of several trillion dollars has been formed, which requires a safe, reliable and huge infrastructure. At present, the most advanced and leading technology in this track is IPFS or Filecoin, which overcomes most of the weaknesses of data storage technologies such as a centralized database in the past. In particular, it provides data security to blockchain distributed nodes and achieves the self-control of data producers. Therefore, IPFS is known as the "file system that will never disappear". The main network of Filecoin has been launched for three months, and the data stored on the whole network has exceeded 2EB, equivalent to 200 Google data. Filecoin is a star project in the coin circle in 2020. According to the data from BlockVC, there are at least 200 to 300 Filecoin miner sellers in China, and the sales volume of several leading manufacturers even exceeds 1 billion yuan. The cost of the mining machine was blown to about 100000 yuan.