Hello, I have some problem on using this library and i have a question.
In bitcoin mastering book, the associative rule is valid in pubkey operations but,
in ec_pubkey_tweak_add, it does not work. i.e. (A+B) + C == A+(B+C) is not working.
iex(7)> {ok, temp1} = :libsecp256k1.ec_pubkey_tweak_add(pub1_uncomp, pub2_uncomp) {:ok, «4, 109, 141, 100, 253, 107, 174, 35, 245, 166, 25, 186, 86, 155, 12, 144, 70, 106, 243, 169, 170, 114, 252, 176, 64, 146, 196, 235, 151, 71, 38, 236, 89, 202, 48, 110, 12, 105, 52, 67, 172, 206, 254, 158, 160, 121, 21, 235, …»} iex(8)> :libsecp256k1.ec_pubkey_tweak_add(temp1, pub3_uncomp) {:ok, «4, 95, 248, 51, 254, 221, 15, 68, 158, 218, 69, 248, 6, 55, 248, 212, 109, 182, 111, 157, 13, 147, 81, 103, 204, 128, 25, 64, 116, 221, 237, 165, 169, 140, 69, 89, 168, 148, 91, 40, 177, 5, 75, 39, 42, 43, 156, 221, …»} iex(9)> {ok, temp2} = :libsecp256k1.ec_pubkey_tweak_add(pub2_uncomp, pub3_uncomp) {:ok, «4, 32, 169, 149, 118, 49, 84, 197, 188, 184, 93, 47, 104, 172, 144, 152, 34, 208, 248, 213, 205, 28, 66, 197, 143, 151, 118, 145, 238, 27, 54, 145, 22, 160, 24, 76, 90, 68, 250, 244, 62, 47, 12, 222, 83, 6, 131, 101, …»} iex(10)> :libsecp256k1.ec_pubkey_tweak_add(pub1_uncomp, temp2) {:ok, «4, 47, 197, 182, 169, 48, 79, 165, 130, 115, 136, 120, 209, 222, 30, 114, 144, 203, 125, 120, 238, 77, 9, 140, 240, 207, 87, 20, 79, 19, 161, 129, 121, 166, 55, 192, 108, 235, 189, 132, 247, 177, 196, 236, 8, 196, 29, 31, …»}
the result of iex(8) and iex(10) is not the same.
what does the ec_pubkey_tweak_add do?
