DLT stands for distributed ledger technology, a way of storing and sharing data across multiple locations on a network instead of keeping it in one central database. Every participant holds a copy of the same records, and changes are verified through agreed-upon rules before being added. Once data is written, it can’t be altered or deleted, only appended. This design removes the need for a single authority to maintain trust between parties.
How a Distributed Ledger Works
A traditional database sits on one server controlled by one organization. If that organization makes an error, gets hacked, or acts dishonestly, the records can be quietly changed. A distributed ledger flips this model. Copies of the ledger live on many computers (called nodes) at once, and all copies must agree before new information is accepted.
Three core components make this possible. First, the network itself: a group of nodes that each store and update their own copy of the ledger. Second, a consensus mechanism, which is the set of rules nodes follow to agree that a new entry is valid. Third, digital signatures, cryptographic tools that verify who submitted a transaction and ensure the data hasn’t been tampered with in transit. The overwhelming majority of distributed ledgers rely on digital signatures for both authentication and data integrity.
Because the ledger is append-only, every transaction becomes a permanent, auditable record. If someone tried to alter a past entry on one node, it would immediately conflict with the copies stored everywhere else on the network.
DLT vs. Blockchain
People often use “DLT” and “blockchain” interchangeably, but blockchain is actually one type of distributed ledger. It organizes data into blocks linked in strict chronological order, with each block cryptographically connected to the one before it. Any change to an earlier block would break this chain and alert every other user on the network.
Not all distributed ledgers use this block-and-chain structure. Some use a format called a directed acyclic graph (DAG), where transactions can be verified in parallel rather than one block at a time. Platforms like IOTA use a pure DAG structure. Research comparing the two approaches has found that DAG-based ledgers offer significantly higher transaction throughput because their internal structure allows full parallelization, something blockchain’s linear design can’t easily achieve. Think of blockchain as a single-lane road where every car must follow the one ahead, while a DAG is more like a multi-lane highway where traffic flows simultaneously.
Public vs. Permissioned Ledgers
Distributed ledgers fall into two broad categories based on who can participate.
Permissionless (public) ledgers are open to anyone. Participants don’t need to reveal their identity beyond a pseudonymous identifier, and no central authority approves who joins. Bitcoin and Ethereum are the most well-known examples. Because participants are anonymous and can’t be held accountable through traditional legal systems, these networks assume zero trust and rely entirely on their protocol to keep everyone honest. The tradeoff is that the consensus mechanisms needed to maintain security in this trustless environment tend to be energy-intensive.
Permissioned (private) ledgers require nodes to be approved before they can validate transactions, and the approval process typically demands full transparency about each participant’s identity. Because validators are known and can face real-world consequences like fines or reputational damage for misbehavior, these systems need less computational overhead to reach consensus. Businesses and governments generally prefer permissioned ledgers because they offer more control over who accesses the network while still distributing trust across multiple parties.
Real-World Uses in Supply Chains
Supply chain management has become one of DLT’s most concrete proving grounds. A global study of more than 150 implementations across 25 countries found that organizations using the technology cut overall supply chain costs by 20 to 30 percent, improved product traceability by 75 percent, and reduced documentation processing time by 85 percent. Most organizations achieved a return on their investment within 18 to 24 months.
The results vary by industry. In the automotive sector, companies using DLT for parts tracking saw cost reductions of 42 percent and time savings of 80 percent. Electronics manufacturers tracking components reported 38 percent cost reductions and 85 percent time savings. Food companies using the technology for source verification cut costs by 28 percent and processing time by 65 percent. Across all implementations studied, the average cost reduction was 35 percent.
These gains come largely from eliminating the back-and-forth reconciliation that happens when multiple companies maintain separate records. When a manufacturer, shipper, customs authority, and retailer all share one ledger, disputes over what was shipped, when, and in what condition shrink dramatically.
Central Bank Digital Currencies
Central banks around the world are experimenting with DLT as the backbone for digital versions of national currencies, known as CBDCs. These projects generally fall into two categories.
Wholesale CBDCs handle large transactions between banks. Canada’s Project Jasper tested clearing and settling high-value interbank payments on a distributed ledger. Singapore’s Project Ubin explored whether the technology could make payment and securities settlement systems more efficient. The European Central Bank and the Bank of Japan jointly ran Project Stella to analyze large-value payment processing and securities delivery. South Africa’s Project Khokha built an enterprise solution on Ethereum to increase transaction volume while maintaining confidentiality. And the mCBDC Bridge project, involving the Bank for International Settlements along with central banks in Thailand, Hong Kong, China, and the UAE, is developing a prototype for instant cross-border payments in multiple currencies.
Retail CBDCs are designed for everyday use by consumers. The Bahamas launched the Sand Dollar, Nigeria introduced the eNaira, and Sweden’s Riksbank built its e-krona pilot explicitly on DLT. China’s digital yuan (e-CNY) is the largest-scale retail CBDC effort, with pilot programs running across major cities. Cambodia, Uruguay, and Ukraine have also launched or tested their own versions.
Limitations Worth Knowing
DLT solves real problems, but it introduces others. The consensus mechanisms that keep permissionless ledgers secure consume significant energy, a point the UK’s National Cyber Security Centre has flagged as a meaningful environmental concern. Blockchain-based systems in particular face scalability limits because their linear data structure can’t be easily parallelized, meaning transaction speeds hit a ceiling as networks grow.
Permissioned ledgers avoid many of these issues but reintroduce a degree of centralization, since someone has to decide who gets access. That partly undermines the “no trusted authority needed” appeal that makes DLT distinctive in the first place. The choice between permissioned and permissionless always involves a tradeoff between performance and decentralization, and the right answer depends entirely on what you’re trying to build.