# The Blockchain Oracle Problem in Decentralized Finance--A Multivocal Approach
## Appendix A
### Bluzzle DeFi Oracle
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* Douceur (2002) Douceur, J.R. The Sybil Attack. In _Peer-To-Pear Systems_; MIT Faculty Club: Cambridge, MA, USA, 2002; pp. 251-260. [CrossRef]
* Gudgeon et al. (2020) Gudgeon, L.; Perez, D.; Harz, D.; Livshits, B.; Gervais, A. The Decentralized Financial Crisis. In _2020 Crypto Valley Conference on Blockchain Technology (CVCBT)_; IEEE: Piscataway, NJ, USA, 2020; pp. 1-15. [CrossRef]
* Zoltu (2020) Zoltu, M. How to Turn $20M into $340M in 15 s. Available online: [[https://medium.com/coinmonks/how-to-turn-20m-into-34](https://medium.com/coinmonks/how-to-turn-20m-into-34)]([https://medium.com/coinmonks/how-to-turn-20m-into-34](https://medium.com/coinmonks/how-to-turn-20m-into-34)) 0m-in-15-s-48d161a42311 (accessed on 1 July 2020).
* Kelso (2020) Kelso, E. $340,000,000 Worth of ETH Locked in Maker DAO Can Be Stolen in Seconds, Right Now, Analyst Claims. Available online: [[https://coinspice.io/news/34000000-worth-of-eth-locked-in-maker-dao-can-be-stolen-in-seconds-right-now-analystclaims/](https://coinspice.io/news/34000000-worth-of-eth-locked-in-maker-dao-can-be-stolen-in-seconds-right-now-analystclaims/)]([https://coinspice.io/news/34000000-worth-of-eth-locked-in-maker-dao-can-be-stolen-in-seconds-right-now-analystclaims/](https://coinspice.io/news/34000000-worth-of-eth-locked-in-maker-dao-can-be-stolen-in-seconds-right-now-analystclaims/)) (accessed on 9 November 2020). * LongForWisdom Flash Loans and Securing the Maker Protocol. Available online: [[https://forum.makerdao.com/t/updates-flash-loans-and-securing-the-maker-protocol/4923](https://forum.makerdao.com/t/updates-flash-loans-and-securing-the-maker-protocol/4923)]([https://forum.makerdao.com/t/updates-flash-loans-and-securing-the-maker-protocol/4923](https://forum.makerdao.com/t/updates-flash-loans-and-securing-the-maker-protocol/4923)) (accessed on 12 June 2021). * Lu (2020) Lu, K. Why DeFi Needs Real Oracles. Available online: [[https://medium.com/bandwidth-defi-needs-real-oracles-beyond-dex-?q&0](https://medium.com/bandwidth-defi-needs-real-oracles-beyond-dex-?q&0) cf192883]([https://medium.com/bandwidth-defi-needs-real-oracles-beyond-dex-?q&0](https://medium.com/bandwidth-defi-needs-real-oracles-beyond-dex-?q&0) cf192883) (accessed on 19 December 2020). * Stevens (2021) Stevens, R. After DeFi Lost $100 Million to Flash Loan Attacks, Curve Pushes Chainlink. Available online: [[https://decrypt.co/49](https://decrypt.co/49)]([https://decrypt.co/49](https://decrypt.co/49)) 758/after-100-million-lost-to-flash-loan-attacks-curve-pushes-chainlink (accessed on 12 February 2021).
* Milnaric (2020) Milnaric, N. DeFi Hacks-Million Lost in 2020. Available online: [[https://nodefactory.io/blog/defi-hacks-millions-lost-in-2020/](https://nodefactory.io/blog/defi-hacks-millions-lost-in-2020/)]([https://nodefactory.io/blog/defi-hacks-millions-lost-in-2020/](https://nodefactory.io/blog/defi-hacks-millions-lost-in-2020/)) (accessed on 9 April 2021).
* Williams (2021) Williams, C. Compound User Liquidated for $49 Million, Price Oracle Blamed. Available online: [[https://cryptobriefing.com/compound-user-liquidated-49-million-price-oracle-blamed/](https://cryptobriefing.com/compound-user-liquidated-49-million-price-oracle-blamed/)]([https://cryptobriefing.com/compound-user-liquidated-49-million-price-oracle-blamed/](https://cryptobriefing.com/compound-user-liquidated-49-million-price-oracle-blamed/)) (accessed on 11 March 2021).