Block mechanism

This one is not written up yet

The definition above is the short version. A full explanation — how it works, a worked example and the exam traps — is still being written. In the meantime the chapter below covers it in context.

Written up from the same chapter

• Delivery Instruction SlipThe signed form on which a beneficial owner instructs the DP to debit the demat account — no beneficiary account can be debited without one, whether the transfer is on-market or off-market.
• InteroperabilityA clearing member choosing one clearing corporation to clear and settle everything it trades, across all exchanges, instead of being tied to a separate clearing corporation per exchange.
• NovationThe clearing corporation stepping into the middle of every trade — becoming the buyer to every seller and the seller to every buyer — so that neither side carries the other's default risk.
• Standing instructionA one-time authority, usually given at account opening, for the DP to credit securities into the account without a fresh instruction each time — the alternative is a Receipt Instruction for every single receipt.