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parity-ethereum
Discontinued The fast, light, and robust client for Ethereum-like networks. (by openethereum)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Case in point. Here's the line of code that introduced a bug in a contract that was ultimately worth $32M:
https://github.com/openethereum/parity-ethereum/blame/4c3217...
https://blog.openzeppelin.com/on-the-parity-wallet-multisig-...
If you look at the associated pull request, it added over 2K lines of code, and removed almost 1K, spread across 20 different files. 5 files have changed so much, GitHub doesn't even show their diff by default.
It was reviewed by one person in a single day.