Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain
As blockchain-based applications and research such as cryptocurrency increase, an oracle problem to bring external data in the blockchain is emerging. Among the methods to solve the oracle problem, a method of configuring oracle based on TLS, an existing internet infrastructure, has been proposed. H...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-12-01
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| Series: | Computers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-431X/10/1/7 |
| _version_ | 1797543359847333888 |
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| author | Junhoo Park Hyekjin Kim Geunyoung Kim Jaecheol Ryou |
| author_facet | Junhoo Park Hyekjin Kim Geunyoung Kim Jaecheol Ryou |
| author_sort | Junhoo Park |
| collection | DOAJ |
| description | As blockchain-based applications and research such as cryptocurrency increase, an oracle problem to bring external data in the blockchain is emerging. Among the methods to solve the oracle problem, a method of configuring oracle based on TLS, an existing internet infrastructure, has been proposed. However, these methods currently have the disadvantage of not supporting privacy protection for external data, and there are limitations in configuring the process of a smart contract based on external data verification for automation. To solve this problem, we propose a framework consisting of middleware of external source server, data prover, and verification contract. The framework converts the data signed in the web server into a proof that the owner can prove with zk-SNARKs and provides a smart contract that can verify this. Through these procedures, data owners not only protect their privacy by proving themselves, but they can also automate on-chain processing through smart contract verification. For the proposed framework, we create a proof using libsnark for server data and show the performance and cost to verify with Solidity the smart contract language of the Ethereum platform. |
| first_indexed | 2024-03-10T13:44:28Z |
| format | Article |
| id | doaj.art-533396fba40c4ac09100e564fc39d234 |
| institution | Directory Open Access Journal |
| issn | 2073-431X |
| language | English |
| last_indexed | 2024-03-10T13:44:28Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Computers |
| spelling | doaj.art-533396fba40c4ac09100e564fc39d2342023-11-21T02:45:58ZengMDPI AGComputers2073-431X2020-12-01101710.3390/computers10010007Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on BlockchainJunhoo Park0Hyekjin Kim1Geunyoung Kim2Jaecheol Ryou3Department of Computer Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Computer Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Computer Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Computer Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaAs blockchain-based applications and research such as cryptocurrency increase, an oracle problem to bring external data in the blockchain is emerging. Among the methods to solve the oracle problem, a method of configuring oracle based on TLS, an existing internet infrastructure, has been proposed. However, these methods currently have the disadvantage of not supporting privacy protection for external data, and there are limitations in configuring the process of a smart contract based on external data verification for automation. To solve this problem, we propose a framework consisting of middleware of external source server, data prover, and verification contract. The framework converts the data signed in the web server into a proof that the owner can prove with zk-SNARKs and provides a smart contract that can verify this. Through these procedures, data owners not only protect their privacy by proving themselves, but they can also automate on-chain processing through smart contract verification. For the proposed framework, we create a proof using libsnark for server data and show the performance and cost to verify with Solidity the smart contract language of the Ethereum platform.https://www.mdpi.com/2073-431X/10/1/7blockchainsmart contractOraclezk-SNARKs |
| spellingShingle | Junhoo Park Hyekjin Kim Geunyoung Kim Jaecheol Ryou Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain Computers blockchain smart contract Oracle zk-SNARKs |
| title | Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain |
| title_full | Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain |
| title_fullStr | Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain |
| title_full_unstemmed | Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain |
| title_short | Smart Contract Data Feed Framework for Privacy-Preserving Oracle System on Blockchain |
| title_sort | smart contract data feed framework for privacy preserving oracle system on blockchain |
| topic | blockchain smart contract Oracle zk-SNARKs |
| url | https://www.mdpi.com/2073-431X/10/1/7 |
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