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How to extract data, blocks from blockcain stored on local disk drive, and acquire it through some usual data transfer chanel (eg. JSON) in other application?

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Run a local daemon, and then use the daemon RPC API to query it for blocks:

https://getmonero.org/knowledge-base/developer-guides/daemon-rpc

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    Expanding on this answer, the jq utility is really handy to filter out the JSON output. To illustrate, have a look at this example, which dealt with the date of the genesis block, and number of days on the blockchain.
    – dpzz
    Commented May 20, 2017 at 22:13

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