Trust Propagation in Blockchain-Powered Multi-Tier Networks: A Credit Transfer Token Framework for Supply Chain Finance

Money moves through the world in complex webs, connecting factories, farms, and shops in a chain of trust. In the business world, this is known as a supply chain. For decades, the system has worked well for the biggest players at the start of the line, but it often leaves smaller companies further down the line struggling to get the cash they need to keep working. These smaller firms, known as small and medium-sized enterprises, face a persistent problem: banks and lenders cannot easily see their reliability because they are too far removed from the main buyer. This lack of visibility creates a barrier, making it expensive or impossible for them to borrow money, even when they are doing good work for a trusted partner.

Researchers have long looked for ways to fix this, often turning to new digital tools that can record transactions securely. One such tool is blockchain, a type of digital ledger that keeps a permanent, unchangeable record of who did what and when. While previous attempts have used this technology to make records clearer, a new study suggests that simply recording information is not enough. The real breakthrough lies in treating a company's reputation and creditworthiness not just as a fact to be recorded, but as a digital object that can be passed along the chain, just like a physical invoice or a shipment of goods. This approach aims to extend the reach of trust, allowing the strong reputation of a large buyer to flow all the way down to the smallest supplier.

A team of researchers from the University of Hertfordshire in the UK has developed a new system to test this idea. They call their invention the Credit Transfer Token. In their framework, a large, creditworthy company works with a bank to get a specific amount of credit approved. Instead of just keeping this approval as a paper agreement, the system turns that approved credit into a digital token. These tokens are created using a specific standard that allows them to be moved easily between different digital wallets. The key innovation is that these tokens represent a promise to pay. When the large company owes money to a supplier, it can send these tokens instead of waiting for a traditional bank transfer.

The researchers built a working model of this system on a public test network called Polygon, which is designed to handle digital transactions quickly and cheaply. They set up a simulated environment with four participants: a large core company, a first-tier supplier who sells directly to the core company, a second-tier supplier who sells to the first one, and a bank. In a traditional setup, the bank would only trust the first supplier because that is the only direct relationship it knows. The second supplier would be invisible to the bank, making it hard for them to get financing. In the researchers' simulation, however, the system allowed the credit tokens to move from the core company to the first supplier, and then from the first supplier directly to the second supplier. This meant the second supplier could now hold a token that was backed by the credit of the large core company, effectively extending the reach of trust through the network.

The results of this simulation were measured against standard industry practices. The researchers found that by using these tokens, the system could reach suppliers that were previously excluded. In their test, the credit signal successfully traveled two steps down the chain, whereas traditional methods typically stop after the first step. This change in reachability had a direct impact on cost. When the researchers calculated the cost of financing a standard invoice of one hundred thousand dollars, the traditional method, which relies on slower, manual verification and higher interest rates, cost about five hundred eight dollars. The new system, which used the digital tokens and automated verification, reduced that cost to about three hundred twenty-three dollars. This represents a reduction of roughly thirty-six percent.

Furthermore, the system offered a way to settle debts without needing to convert the digital tokens back into regular cash immediately. If a supplier received a token and needed to pay their own supplier, they could simply pass the token along. This direct transfer settled the debt instantly without any financing cost at all, a feature that does not exist in the current banking system. The speed of the process was also dramatically faster. While traditional paper-based trade finance can take weeks to process, the digital system completed the key steps of issuing, transferring, and redeeming the tokens in less than a minute. The entire cycle of operations took only about sixty-three seconds in their test environment.

The study does not claim that this system is ready to replace the global banking system overnight. The researchers were careful to note that their findings come from a controlled simulation on a test network, not a live, real-world deployment with millions of dollars at stake. They acknowledge that real supply chains are far more complex than the simple four-node model they tested, and that integrating this technology with existing bank systems and legal regulations will be a significant challenge. However, the simulation provides strong evidence that the concept works. It shows that by turning credit into a transferable digital asset, it is possible to overcome the information barriers that currently lock smaller companies out of affordable financing.

This work suggests a shift in how we think about trust in business. Instead of viewing trust as a static relationship between two specific companies, the researchers propose viewing it as a signal that can travel through a network. By making credit portable and programmable, the system allows the financial strength of a large corporation to support its entire ecosystem, not just its immediate partners. The study concludes that this network-oriented approach could fundamentally change how money flows through the global economy, offering a path to financial inclusion for the many small businesses that keep the supply chain moving but have long been left behind by traditional finance.