release state of library vs bitcoin-core

[nessence]

Is there particular commit of this repos which can be used for production, or is github.com/bitcoin the best code for applications to use?

[sipa]

There is no formal release of libsecp256k1 yet, and using it for production purposes is discouraged. Bitcoin Core includes a pre-release version of this library, but only for signing, as that already provides benefits (in terms of side channel attack protection and deterministic signing) over the old OpenSSL code. However, that's only reasonable because signing has much lower risks, while verification is still done by the old code.

[sipa]

In particular, the API is not stable yet.

[sipa]

Closing this issue in favor of #286.