… oracle approaches, techniques, and platforms. Moreover, we discuss open research
challenges that should be addressed to ensure secure and trustworthy blockchain oracles. …

… further investigated related issues [2]. The subject of … data, blockchain applications rely on
centralized and trusted third … Existing oracle types are also compared (in terms of efficiency), …

… the various aspects for open research challenges and future … blockchain Oracles to build
safe and resilient blockchain-based … In this paper, a detailed comparison between Oracles and …

… Oracles are centralized and trusted third parties that constitute … A recent study from
Pennsylvania University compared the … create problems when implementing oracles on the …

… reliance on a trusted third party in the Blockchain ecosystem. … and their underlying mechanisms
and compare them. In the end… the open research challenges in the field of Oracles. These …

… feed off-chain data to blockchain applications. In this paper, … of the trustworthiness issues
of DeFi oracles in this paper. … ,” MDPI Open Access Journals, Applied Science, vol. 11, 2021…

… aspects that resolve common challenges and may lead to a … the blockchain by trusted third
parties known as oracles. Unlike … One main difference between Bitcoin and Hyperledger …

… challenge of bringing data to the blockchain in a trustworthy way… comparison of existing
Oracle approaches with regards to requirements that we derived from challenges for Trustworthy …

… Blockchain is known to be highly reliable, but oracles are off-… to compare and characterize
existing blockchain oracles … mechanisms from industry, reviewed them, and compared …

… Blockchain oracles can directly interact with smart contracts. Therefore, it is important that
oracles provide reliable … Our review shows that the data which is sent by oracles, come from …