A blockchain is used to store data, but instead of putting it in a single place, it is stored all over the world. This makes it more secure but slower and more expensive. There are many blockchains (bitcoin, ethereum and others), but most of them have little storage capacity, which makes it unfeasible to use them to store photographs due to the high cost. Arweave is the blockchain where uniiku stores the info of the certificates. Unlike other blockchains, Arweave is specialized in storing large amounts of data. When you upload something to the uniiku, we pay the miners to write it in the blockchain. In exchange, the network will preserve the information forever. The network of Arweave miners is distributed around the world, as no permission is required to provide storage to the network. Anyone with the equipment and knowledge can do it. Thanks to Arweave, the history of your piece achieves the following: • It is impossible to tamper with, change or delete • By having a time stamp, no one can create a record of your work prior to the original • It can be used in a trial as legal evidence • You will never have to worry about that data again. They are simply there • The story of your piece will last forever