There are 4 main types of distributed ledger technologies: proof of work, leader-based, economy-based, and hashgraph. Proof of work uses miners to validate transactions and reaches consensus but is energy intensive. Leader-based uses designated leaders but is vulnerable to DDoS attacks and scaling issues. Economy-based is self-regulated but not provably secure. Hashgraph achieves very high speeds, deterministic finality, and is resistant to DDoS attacks.

1. 4 Types of Distributed Ledger Technologies (DLT)
DLT allows a group of computers to come to an agreement amid a minority of malicious or faulty computers
Proof of
Work
Benefits:
• Proven implementations
• Market incentives
Drawbacks:
• Regulated by miners
• Energy intensive
Leader
Based
Benefits:
• Proven implementations
Drawbacks :
• Regulated by leaders
• Vulnerable to DDoS attacks
• Slows as network scales
Economy
Based
Benefits:
• Self regulated
• Resistant to DDoS attacks
Drawbacks :
• Not provably secure
Hash-
graph
Benefits:
• Resistant to DDoS attacks
• Self regulated
• Fast at determining finality
Drawbacks :
• Emerging implementations
Speed: Low
Finality: Probabilistic
Speed: Medium
Finality: Probabilistic
Speed: High
Finality: Deterministic
Speed: Very High
Finality: Deterministic