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Merge bitcoin-core/secp256k1#748: Add usage examples
7c9502c Add a copy of the CC0 license to the examples (Elichai Turkel) 42e0343 Add usage examples to the readme (Elichai Turkel) 517644e Optionally compile the examples in autotools, compile+run in travis (Elichai Turkel) 422a7cc Add a ecdh shared secret example (Elichai Turkel) b0cfbcc Add a Schnorr signing and verifying example (Elichai Turkel) fee7d4b Add an ECDSA signing and verifying example (Elichai Turkel) Pull request description: ACKs for top commit: real-or-random: ACK 7c9502c jonasnick: ACK 7c9502c Tree-SHA512: c475cfd5b324b1e2d7126aa5bb1e7da25183b50adb7357d464c140de83d9097cb1bdc027d09aeadf167dbf9c8afd123235b0a1a742c5795089862418fafa1964
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