The central register of book-entry securities is kept according to the following rules:
- Immutability and verifiability of records of finalized entries (finality of entries)
- Chaining entries (daily control of balances in terms of consistence with the entire chain of prior entries)
- Completion of transaction via a direct transfer between holder accounts (absence of interim entries on the accounts of agents)
Each account in the central register is replicated to precisely one technical settlement account on the T2S (TARGET2-Securities) pan-European settlement platform, which independently of one another verify the fulfilment of the transfer terms.