This is the chapter that makes everything else in Foundations earn its keep. The other nine chapters explain how tokenisation works as a legal, operational, and regulatory construct. This one explains why a CFO, a treasurer, a head of post-trade, or a markets supervisor would spend the political capital to get a programme approved in the first place. The headline answer comes in four moves: settlement compression, 24/7 operability, programmability, and composability. Each is a property the existing rails do not give institutions, and each shows up in a real production system today.
Settlement compression
The standard settlement window for a US equity trade dropped from T+2 to T+1 in May 2024 (SEC press release). For a tokenized instrument settling on a chain operated by a designated system, the window collapses further, in many cases to seconds. Partior routes interbank tokenised-deposit transfers in under 120 seconds versus a roughly two-day correspondent-banking baseline. Kinexys Digital Payments has settled cumulative notional above USD 3 trillion through late 2025 with average daily volume above USD 5 billion, and the round-trip from instruction to credited balance is measured in seconds, not business days.
The cost of T+1 or T+2 is not abstract. It is the working capital trapped in unsettled positions, the funding cost of bridging the float, and the credit exposure to the clearing chain while the trade is in flight. The DTCC put the post-T+1 reduction in margin requirements alone at roughly 41% in its post-implementation review, which is the kind of capital release that makes institutional treasurers pay attention (DTCC report). Pulling the same lever again from T+1 to T+0 atomic, on the same instrument, is what tokenisation programmes are selling. Chapter IV on settlement finality explains why the legal layer is what does the work, not the chain itself.
24/7 operability
Settlement systems built around national real-time gross settlement (RTGS) windows close. Fedwire opens at 21:00 ET the prior evening and closes at 19:00 ET; the Bank of England's CHAPS runs from 06:00 to 18:00 UK time. CLS, the FX settlement utility, operates a five-hour window. None of this matters until a counterparty in Singapore needs USD on a Sunday, or an Asian bank wants to fund a position before its London desk opens.
Tokenised deposit and stablecoin rails do not close. BUIDL holders can in principle redeem against BlackRock's Securitize-operated Circle smart contract for USDC at any hour, subject only to KYC gating. Project Ensemble initially clears interbank legs through HKD RTGS, but its target end state is round-the-clock settlement on tokenised central-bank money. The HKMA Annual Report 2024 frames Ensemble as an FMI development project specifically aimed at supporting tokenised activity outside RTGS hours (HKMA Annual Report 2024). For a treasurer running cash across Asian, European, and US hours, "operates outside RTGS windows" is the line item that justifies most of the build cost.
Programmability
A bank wire is a flat instruction to move money. A token is an instruction to move money attached to a contract that can read its own context. Conditional payments (release the cash leg only if the security leg has settled), automated waterfalls (route coupon payments to the right tranche at the right time), intraday repo (open and close a financing position inside a single business day with no overnight float), and permissioned distributions (block a payment to a sanctioned wallet at the contract level) are all instances of the same property. The chain holds the programme; the programme is what the bank's treasury team would otherwise be running on paper, in spreadsheets, or in an EMS at the cost of human hours.
Broadridge's Distributed Ledger Repo platform settled USD 339 billion in average daily repo volume in September 2025 on Canton, with the contract logic enforcing the substitution and recall mechanics that were previously a manual operations workflow. Chapter VI on atomic DvP takes the most-overused word in the marketing deck, "atomic settlement", and shows what it actually buys an institution. The short version is that programmability is the primitive; atomic DvP is a particular use of it.
Composability
Composability is the property that the same on-chain instrument can stand as collateral, as cash, or as the underlying of a derivative across multiple venues without leaving the chain. A tokenised MMF (money-market fund) interest pledged at Counterparty A in the morning can be unpledged and pledged at Counterparty B in the afternoon, with the chain enforcing exclusivity. The same BUIDL share that backs a margin obligation at one prime broker can, in principle, back a different obligation at another, without moving custodians or waiting for a redemption cycle.
This is the property that public-chain DeFi (decentralised finance) gets credit for inventing, and it is the property that the institutional stack borrows most carefully. The constraint is the composability paradox: regulated venues want exclusive control over their margin collateral, which fights composability by design. Most production programmes today resolve the tension by composing only inside a specific venue or consortium (tokenised collateral networks like Kinexys's Tokenized Collateral Network), with cross-venue composability still mostly aspirational.
The rest of this chapter walks through why TradFi cares now (Part 2), how the architectural choices break down (Part 3), what tokenisation actually unlocks at the capability layer (Part 4), and what it does not fix (Part 5). Read all five before deciding which deeper chapter to pick up first.