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Sirius, also known as Martti Malmi, was an early contributor to Bitcoin and is known for being the first to bring a cat into the crypto space through his profile picture (PFP). Malmi played a crucial role in Bitcoin's development and was the founder of the Bitcoin Forum (bitcointalk.org). His use of a cat as his PFP made it the first cat to symbolically enter the world of crypto, adding a playful touch to the early Bitcoin community, which has since grown into a global movement.