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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.
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proof-of-history-explained
code example for article: "proof of history explained" published on medium
Internally, the (at-block) function runs the given code body with access to the system state as it was as of the end of block 0xabc. The system state is represented internally as a set of key/value pairs indexed by a forest of authenticated hash tries which make it efficient to query a key as of a particular block (see https://github.com/stacksgov/sips/blob/main/sips/sip-004/sip... for details).
Suppose bob.btc was registered in block 1002 (hash 0xdef). The above (at-block) call will not resole bob.btc in the old contract, because its state was written after the sunset block 0xabc.
If you want something similar to Filecoin that is live and in use, check out http://siasky.net/
Siacoin has been around for a while and approaches things differently. Plus its already being used by people.
I have found these two to be useful:
https://github.com/lsmod/proof-of-history-explained