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## Distributed Ledger Technology (DLT)

### Definition and Purpose
Distributed Ledger Technology (DLT) is a decentralized method of recording, sharing, and synchronizing data across multiple locations without needing a central authority. Unlike traditional databases, which are centralized and managed by a single entity, DLT distributes data across various participants, or nodes, in a peer-to-peer network. This structure enhances data integrity, transparency, and security, as all participants share identical copies of the data and can independently verify its accuracy. DLT underpins blockchain and offers a foundation for developing trustless systems, where users interact without intermediaries.

### Types of Distributed Ledgers
– **Permissionless Ledgers**: Open networks like Bitcoin and Ethereum allow anyone to join as a node, validate transactions, and participate in the ledger’s upkeep, fostering decentralization and inclusivity. However, these networks can be slower and less energy-efficient.
– **Permissioned Ledgers**: Private networks, like Hyperledger, restrict access to approved participants, making them faster and more efficient but sacrificing some decentralization.
– **Hybrid Ledgers**: Systems like Ripple use a hybrid approach, allowing specific nodes to validate transactions while making data accessible to the public, balancing decentralization and efficiency.

### Core Characteristics of DLT
– **Immutability**: Transactions are permanent and tamper-resistant once recorded, providing a transparent and trustworthy ledger.
– **Decentralization**: Data is replicated across numerous nodes, preventing control by any single entity.
– **Consensus Mechanisms**: Agreement protocols (like Proof of Work and Proof of Stake) validate and verify data across the network.

### DLT Use Cases and Real-World Applications
– **Finance**: Enables faster, cheaper cross-border payments without intermediaries, like SWIFT.
– **Supply Chain**: Allows stakeholders to track goods in real-time, enhancing transparency and reducing fraud.
– **Healthcare**: Improves data sharing and security across institutions without risking patient privacy.

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### Links to Related Notes
[[1.1.1 Blockchain Basics and as a DLT Subtype]]