UPI block collateral enables direct client-level settlement and CC debits to secure trading obligations without member custody. SEBI introduces a supplementary UPI block facility allowing investors to block funds in favour of the clearing corporation for use as cash collateral and settlement without transferring funds to members. The CC will debit these blocks for client-level obligations, settlement follows two pay-in rounds and one pay-out with direct client pay-outs for compliant UPI-block clients, shortages are managed by debiting blocks or devolving residuals to clearing members, and securities collateral remains via pledge/re-pledge of approved instruments.