Just for learning, Do not use in production environment.
Without performance optimization, verifying two signatures in one call will cause the instruction limit to be exceeded.
# Starts the replica, running in the background
dfx start --background
# Deploys your canisters to the replica and generates your candid interface
dfx deploy
dfx canister call ecdsa_motoko_backend test_secp256r11
(true)
dfx canister call ecdsa_motoko_backend test_secp256r12
(true)