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I would like to get some clarification on which version of the JSON-RPC protocol does Bitcoin use? 1.0 or 2.0?

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up vote 4 down vote accepted

A little of both:

// JSON-RPC protocol.  Bitcoin speaks version 1.0 for maximum compatibility,
// but uses JSON-RPC 1.1/2.0 standards for parts of the 1.0 standard that were
// unspecified (HTTP errors and contents of 'error').
// 1.0 spec:
// 1.2 spec:
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