This Practice Note outlines key elements regarding the authorisation of a crypto-asset service provider (CASP) in Ireland. In particular, this Practice Note outlines the services which require authorisation as a CASP, the CASP authorisation process, the scope of permitted CASP activities, and the relevant exemptions and transitional provisions.It covers the regulatory framework for CASP authorisations in Ireland, including the application of the Markets in Crypto-Assets Regulation (Regulation (EU) 2023/1114) (MiCAR) and the role of the Central Bank of Ireland (CBI) as the national competent authority for the supervision of CASPs in Ireland. It details the types of crypto-asset services that require authorisation, the step-by-step authorisation process, and the conditions applicants must meet. The Practice Note also addresses the notification procedure for existing regulated financial service providers wishing to provide crypto-asset services under MiCAR, transitional provisions for existing virtual asset service providers (VASPs), and practical considerations for preparing a successful