What are the key differences between centralized and decentralized oracles?

Centralized Oracles:

• Single entity controls data provision
• Faster and cheaper to implement
• Creates single point of failure
• Higher risk of manipulation or censorship
• Limited transparency in data sourcing

Decentralized Oracles (like Chainlink):

• Multiple independent nodes provide data
• Higher security through redundancy
• Resistance to manipulation and censorship
• Cryptographic proofs of data integrity
• Transparent data aggregation mechanisms
• Higher cost but better security guarantees

The trade-off is between speed/cost versus security/reliability. For high-value financial applications, decentralized oracles are typically preferred despite the additional complexity.