Gucci parent company Kering's Swiss watchmaking brand Ulysee Nardin is using blockchain to prove the authenticity of its watches. Ulysee Nardin has started this project since the end of 2019. Specifically, after purchasing a watch from Ulysee Nardin, the customer will receive a PDF file containing all information about the watch, such as serial number, model number, and warranty information. Customers can then track watches on the ledger of the Bitcoin blockchain. Not only is this convenient, but the relevant product information can be used to prove the authenticity of the watch and its maintenance history.