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xeros
Discontinued Xero is a digital currency that allows instant payments to anyone, anywhere. Xero has been written completely in PHP and follows the same technical design as Bitcoin. Xero uses P2P technology to operate with no central server.
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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.
If you would like to check the source code out, please check out my github repo: https://github.com/kladskull/xeros - perhaps you'd like to do some contribution as well?
Can't share my bitcoin code as I keep that commercial, but there's some excellent PHP libraries around to learn from. I can highly recommend BitWasp at: https://github.com/Bit-Wasp/BitWasp