Task 50442491072

key: use static context for libsecp256k1 calls where applicable

2025-09-15 23:48:45 aborted 202509-secp256k1_context_sign-only-if-necessary 455ff6c42e8be10690e1b34c0508a784f71e5432

ccache_hitrate:

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test each commit

202509-secp256k1_context_sign-only-if-necessary