Libbitcoin Consensus

The libbitcoin-consensus library is an optional dependency of libbitcoin-blockchain. It is conceptually redundant with native functionality within libbitcoin.

Example

#include <cstdint>
#include <string>
#include <vector>
#include <bitcoin/consensus.hpp>

// For bc::decode_base16 utility.
#include <bitcoin/bitcoin.hpp>

#define VERIFY_TX \
    "01000000017d01943c40b7f3d8a00a2d62fa1d560bf739a2368c180615b0a793" \
    "7c0e883e7c000000006b4830450221008f66d188c664a8088893ea4ddd968902" \
    "4ea5593877753ecc1e9051ed58c15168022037109f0d06e6068b7447966f751d" \
    "e8474641ad2b15ec37f4a9d159b02af68174012103e208f5403383c77d5832a2" \
    "68c9f71480f6e7bfbdfa44904becacfad66163ea31ffffffff01c8af00000000" \
    "00001976a91458b7a60f11a904feef35a639b6048de8dd4d9f1c88ac00000000"

#define PREVOUT_SCRIPT \
    "76a914c564c740c6900b93afc9f1bdaef0a9d466adf6ee88ac"

// Validate a transaction against a single previous output script.
int main()
{
    using namespace libbitcoin::consensus;

    constexpr uint32_t tx_input_index = 0;
    constexpr uint32_t flags = verify_flags_standard | verify_flags_mandatory;

    const std::string tx(VERIFY_TX);
    const std::string ps(PREVOUT_SCRIPT);

    std::vector<uint8_t> tx_data, ps_data;
    /* bool */ bc::decode_base16(tx_data, tx);
    /* bool */ bc::decode_base16(ps_data, ps);

    const auto result = verify_script(&tx_data[0], tx_data.size(),
        &ps_data[0], ps_data.size(), tx_input_index, flags);

    return result == verify_result_eval_true ? 0 : 1;
}

Bindings

The library exposes a C++ interface and includes SWIG generated bindings for other languages.

• C++ (native)
• Java
• Python

Dependencies

• openssl (optional, default)
• libsecp256k1 (optional, experimental)
• boost test (tests only)

See Also

• Libbitcoin