What is Ein & Cik for Coinbase Inc?

Could you please elaborate on the significance and purpose of "Ein & Cik" for Coinbase Inc.? I'm curious to understand how these acronyms relate to the company's operations and compliance within the cryptocurrency and finance industry. Are they regulatory identifiers? If so, what specific regulations do they pertain to? Additionally, how do these identifiers ensure Coinbase's compliance and transparency in its business practices? Any insights you could provide would be greatly appreciated.