r1_1 = 02de97092bfb7c02148a827b4f8b62db1e189a739c77815799df5e6fb35ae88a1f
r2_1 = 02838db77b981db321faf527a830461cfda01aed50d85c345a7b0a8f4e5e4fd3fc
delta  = 031e283a9ebc4c50b0a93f27d411e69d0a97aad2a6d4ae26f5725f8b55fb5176f5
delta _k = 0xfffffffffffffffffffffffffffffffebaaedce6af487e246f4eac90b714b3bd