Function CreateBlindValueProof

src/blindpsbt.cpp:125–139

Create an explicit value rangeproof which proves that the commitment commits to an explicit value

// Create an explicit value rangeproof which proves that the commitment commits to an explicit value
static bool CreateBlindValueProof(std::vector<unsigned char>& rangeproof, const uint256& value_blinder, const CAmount amount, const secp256k1_pedersen_commitment& value_commit, const secp256k1_generator& gen)
{
    // Prep rangeproof
    size_t rangeproof_len = 5134;
    rangeproof.resize(rangeproof_len);

    // Generate a new random nonce
    uint256 nonce;
    GetStrongRandBytes(nonce.begin(), nonce.size());

    // Make the rangeproof
    int res = secp256k1_rangeproof_sign(secp256k1_blind_context, rangeproof.data(), &rangeproof_len, /* min_value */ amount, &value_commit, value_blinder.begin(), nonce.begin(), /* exp */ -1, /* min_bits */ 0, amount, /* message */ nullptr, /* message_len */ 0, /* extra_commit */ nullptr, /* extra_commit_len */ 0, &gen);
    rangeproof.resize(rangeproof_len);
    return res == 1;
}

bool CreateBlindValueProof(std::vector<unsigned char>& rangeproof, const uint256& value_blinder, const CAmount amount, const CConfidentialValue& conf_value, const CConfidentialAsset& conf_asset)
{