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Merge pull request #4036

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9acf42d3 Multisig M/N functionality core tests added (naughtyfox)
9f3963e8 Arbitrary M/N multisig schemes: * support in wallet2 * support in monero-wallet-cli * support in monero-wallet-rpc * support in wallet api * support in monero-gen-trusted-multisig * unit tests for multisig wallets creation (naughtyfox)
This commit is contained in:
Riccardo Spagni
2018-10-07 19:57:26 +02:00
parent 24e519b9b6
commit 84cc3b916e
18 changed files with 853 additions and 266 deletions
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src/wallet/wallet2.cpp
+308 -102
View File
@@ -122,6 +122,7 @@ using namespace cryptonote;
#define FIRST_REFRESH_GRANULARITY 1024
static const std::string MULTISIG_SIGNATURE_MAGIC = "SigMultisigPkV1";
static const std::string MULTISIG_EXTRA_INFO_MAGIC = "MultisigxV1";
namespace
{
@@ -133,6 +134,42 @@ namespace
dir /= ".shared-ringdb";
return dir.string();
}
std::string pack_multisignature_keys(const std::string& prefix, const std::vector<crypto::public_key>& keys, const crypto::secret_key& signer_secret_key)
{
std::string data;
crypto::public_key signer;
CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(signer_secret_key, signer), "Failed to derive public spend key");
data += std::string((const char *)&signer, sizeof(crypto::public_key));
for (const auto &key: keys)
{
data += std::string((const char *)&key, sizeof(crypto::public_key));
}
data.resize(data.size() + sizeof(crypto::signature));
crypto::hash hash;
crypto::cn_fast_hash(data.data(), data.size() - sizeof(crypto::signature), hash);
crypto::signature &signature = *(crypto::signature*)&data[data.size() - sizeof(crypto::signature)];
crypto::generate_signature(hash, signer, signer_secret_key, signature);
return MULTISIG_EXTRA_INFO_MAGIC + tools::base58::encode(data);
}
std::vector<crypto::public_key> secret_keys_to_public_keys(const std::vector<crypto::secret_key>& keys)
{
std::vector<crypto::public_key> public_keys;
public_keys.reserve(keys.size());
std::transform(keys.begin(), keys.end(), std::back_inserter(public_keys), [] (const crypto::secret_key& k) -> crypto::public_key {
crypto::public_key p;
CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(k, p), "Failed to derive public spend key");
return p;
});
return public_keys;
}
}
namespace
@@ -776,6 +813,7 @@ wallet2::wallet2(network_type nettype, uint64_t kdf_rounds, bool unattended):
m_callback(0),
m_trusted_daemon(false),
m_nettype(nettype),
m_multisig_rounds_passed(0),
m_always_confirm_transfers(true),
m_print_ring_members(false),
m_store_tx_info(true),
@@ -2918,6 +2956,7 @@ bool wallet2::clear()
m_address_book.clear();
m_subaddresses.clear();
m_subaddress_labels.clear();
m_multisig_rounds_passed = 0;
return true;
}
@@ -2932,6 +2971,7 @@ bool wallet2::store_keys(const std::string& keys_file_name, const epee::wipeable
{
std::string account_data;
std::string multisig_signers;
std::string multisig_derivations;
cryptonote::account_base account = m_account;
crypto::chacha_key key;
@@ -2984,6 +3024,14 @@ bool wallet2::store_keys(const std::string& keys_file_name, const epee::wipeable
CHECK_AND_ASSERT_MES(r, false, "failed to serialize wallet multisig signers");
value.SetString(multisig_signers.c_str(), multisig_signers.length());
json.AddMember("multisig_signers", value, json.GetAllocator());
r = ::serialization::dump_binary(m_multisig_derivations, multisig_derivations);
CHECK_AND_ASSERT_MES(r, false, "failed to serialize wallet multisig derivations");
value.SetString(multisig_derivations.c_str(), multisig_derivations.length());
json.AddMember("multisig_derivations", value, json.GetAllocator());
value2.SetUint(m_multisig_rounds_passed);
json.AddMember("multisig_rounds_passed", value2, json.GetAllocator());
}
value2.SetInt(m_always_confirm_transfers ? 1 :0);
@@ -3156,6 +3204,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
m_multisig = false;
m_multisig_threshold = 0;
m_multisig_signers.clear();
m_multisig_rounds_passed = 0;
m_multisig_derivations.clear();
m_always_confirm_transfers = false;
m_print_ring_members = false;
m_default_mixin = 0;
@@ -3214,6 +3264,8 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
m_multisig = field_multisig;
GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, multisig_threshold, unsigned int, Uint, m_multisig, 0);
m_multisig_threshold = field_multisig_threshold;
GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, multisig_rounds_passed, unsigned int, Uint, false, 0);
m_multisig_rounds_passed = field_multisig_rounds_passed;
if (m_multisig)
{
if (!json.HasMember("multisig_signers"))
@@ -3234,6 +3286,24 @@ bool wallet2::load_keys(const std::string& keys_file_name, const epee::wipeable_
LOG_ERROR("Field multisig_signers found in JSON, but failed to parse");
return false;
}
//previous version of multisig does not have this field
if (json.HasMember("multisig_derivations"))
{
if (!json["multisig_derivations"].IsString())
{
LOG_ERROR("Field multisig_derivations found in JSON, but not String");
return false;
}
const char *field_multisig_derivations = json["multisig_derivations"].GetString();
std::string multisig_derivations = std::string(field_multisig_derivations, field_multisig_derivations + json["multisig_derivations"].GetStringLength());
r = ::serialization::parse_binary(multisig_derivations, m_multisig_derivations);
if (!r)
{
LOG_ERROR("Field multisig_derivations found in JSON, but failed to parse");
return false;
}
}
}
GET_FIELD_FROM_JSON_RETURN_ON_ERROR(json, always_confirm_transfers, int, Int, false, true);
m_always_confirm_transfers = field_always_confirm_transfers;
@@ -3869,12 +3939,12 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
CHECK_AND_ASSERT_THROW_MES(!view_keys.empty(), "empty view keys");
CHECK_AND_ASSERT_THROW_MES(view_keys.size() == spend_keys.size(), "Mismatched view/spend key sizes");
CHECK_AND_ASSERT_THROW_MES(threshold > 1 && threshold <= spend_keys.size() + 1, "Invalid threshold");
CHECK_AND_ASSERT_THROW_MES(threshold == spend_keys.size() || threshold == spend_keys.size() + 1, "Unsupported threshold case");
std::string extra_multisig_info;
crypto::hash hash;
clear();
std::vector<crypto::secret_key> multisig_keys;
rct::key spend_pkey = rct::identity();
rct::key spend_skey;
std::vector<crypto::public_key> multisig_signers;
// decrypt keys
epee::misc_utils::auto_scope_leave_caller keys_reencryptor;
@@ -3887,43 +3957,78 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
keys_reencryptor = epee::misc_utils::create_scope_leave_handler([&, this, chacha_key]() { m_account.encrypt_keys(chacha_key); m_account.decrypt_viewkey(chacha_key); });
}
MINFO("Creating spend key...");
std::vector<crypto::secret_key> multisig_keys;
rct::key spend_pkey, spend_skey;
// In common multisig scheme there are 4 types of key exchange rounds:
// 1. First round is exchange of view secret keys and public spend keys.
// 2. Middle round is exchange of derivations: Ki = b * Mj, where b - spend secret key,
// M - public multisig key (in first round it equals to public spend key), K - new public multisig key.
// 3. Secret spend establishment round sets your secret multisig keys as follows: kl = H(Ml), where M - is *your* public multisig key,
// k - secret multisig key used to sign transactions. k and M are sets of keys, of course.
// And secret spend key as the sum of all participant's secret multisig keys
// 4. Last round establishes multisig wallet's public spend key. Participants exchange their public multisig keys
// and calculate common spend public key as sum of all unique participants' public multisig keys.
// Note that N/N scheme has only first round. N-1/N has 2 rounds: first and last. Common M/N has all 4 rounds.
// IMPORTANT: wallet's public spend key is not equal to secret_spend_key * G!
// Wallet's public spend key is the sum of unique public multisig keys of all participants.
// secret_spend_key * G = public signer key
if (threshold == spend_keys.size() + 1)
{
// In N / N case we only need to do one round and calculate secret multisig keys and new secret spend key
MINFO("Creating spend key...");
// Calculates all multisig keys and spend key
cryptonote::generate_multisig_N_N(get_account().get_keys(), spend_keys, multisig_keys, spend_skey, spend_pkey);
}
else if (threshold == spend_keys.size())
{
cryptonote::generate_multisig_N1_N(get_account().get_keys(), spend_keys, multisig_keys, spend_skey, spend_pkey);
// We need an extra step, so we package all the composite public keys
// we know about, and make a signed string out of them
std::string data;
crypto::public_key signer;
CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(rct::rct2sk(spend_skey), signer), "Failed to derive public spend key");
data += std::string((const char *)&signer, sizeof(crypto::public_key));
for (const auto &msk: multisig_keys)
{
rct::key pmsk = rct::scalarmultBase(rct::sk2rct(msk));
data += std::string((const char *)&pmsk, sizeof(crypto::public_key));
}
data.resize(data.size() + sizeof(crypto::signature));
crypto::cn_fast_hash(data.data(), data.size() - sizeof(signature), hash);
crypto::signature &signature = *(crypto::signature*)&data[data.size() - sizeof(crypto::signature)];
crypto::generate_signature(hash, signer, rct::rct2sk(spend_skey), signature);
extra_multisig_info = std::string("MultisigxV1") + tools::base58::encode(data);
// Our signer key is b * G, where b is secret spend key.
multisig_signers = spend_keys;
multisig_signers.push_back(get_multisig_signer_public_key(get_account().get_keys().m_spend_secret_key));
}
else
{
CHECK_AND_ASSERT_THROW_MES(false, "Unsupported threshold case");
// We just got public spend keys of all participants and deriving multisig keys (set of Mi = b * Bi).
// note that derivations are public keys as DH exchange suppose it to be
auto derivations = cryptonote::generate_multisig_derivations(get_account().get_keys(), spend_keys);
spend_pkey = rct::identity();
multisig_signers = std::vector<crypto::public_key>(spend_keys.size() + 1, crypto::null_pkey);
if (threshold == spend_keys.size())
{
// N - 1 / N case
// We need an extra step, so we package all the composite public keys
// we know about, and make a signed string out of them
MINFO("Creating spend key...");
// Calculating set of our secret multisig keys as follows: mi = H(Mi),
// where mi - secret multisig key, Mi - others' participants public multisig key
multisig_keys = cryptonote::calculate_multisig_keys(derivations);
// calculating current participant's spend secret key as sum of all secret multisig keys for current participant.
// IMPORTANT: participant's secret spend key is not an entire wallet's secret spend!
// Entire wallet's secret spend is sum of all unique secret multisig keys
// among all of participants and is not held by anyone!
spend_skey = rct::sk2rct(cryptonote::calculate_multisig_signer_key(multisig_keys));
// Preparing data for the last round to calculate common public spend key. The data contains public multisig keys.
extra_multisig_info = pack_multisignature_keys(MULTISIG_EXTRA_INFO_MAGIC, secret_keys_to_public_keys(multisig_keys), rct::rct2sk(spend_skey));
}
else
{
// M / N case
MINFO("Preparing keys for next exchange round...");
// Preparing data for middle round - packing new public multisig keys to exchage with others.
extra_multisig_info = pack_multisignature_keys(MULTISIG_EXTRA_INFO_MAGIC, derivations, m_account.get_keys().m_spend_secret_key);
spend_skey = rct::sk2rct(m_account.get_keys().m_spend_secret_key);
// Need to store middle keys to be able to proceed in case of wallet shutdown.
m_multisig_derivations = derivations;
}
}
// the multisig view key is shared by all, make one all can derive
clear();
MINFO("Creating view key...");
crypto::secret_key view_skey = cryptonote::generate_multisig_view_secret_key(get_account().get_keys().m_view_secret_key, view_keys);
@@ -3935,18 +4040,10 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
m_account_public_address = m_account.get_keys().m_account_address;
m_watch_only = false;
m_multisig = true;
m_multisig_threshold = threshold;
m_key_device_type = hw::device::device_type::SOFTWARE;
if (threshold == spend_keys.size() + 1)
{
m_multisig_signers = spend_keys;
m_multisig_signers.push_back(get_multisig_signer_public_key());
}
else
{
m_multisig_signers = std::vector<crypto::public_key>(spend_keys.size() + 1, crypto::null_pkey);
}
m_multisig_threshold = threshold;
m_multisig_signers = multisig_signers;
++m_multisig_rounds_passed;
// re-encrypt keys
keys_reencryptor = epee::misc_utils::auto_scope_leave_caller();
@@ -3961,13 +4058,147 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
return extra_multisig_info;
}
std::string wallet2::make_multisig(const epee::wipeable_string &password,
const std::vector<std::string> &info,
uint32_t threshold)
std::string wallet2::exchange_multisig_keys(const epee::wipeable_string &password,
const std::vector<std::string> &info)
{
THROW_WALLET_EXCEPTION_IF(info.empty(),
error::wallet_internal_error, "Empty multisig info");
if (info[0].substr(0, MULTISIG_EXTRA_INFO_MAGIC.size()) != MULTISIG_EXTRA_INFO_MAGIC)
{
THROW_WALLET_EXCEPTION_IF(false,
error::wallet_internal_error, "Unsupported info string");
}
std::vector<crypto::public_key> signers;
std::unordered_set<crypto::public_key> pkeys;
THROW_WALLET_EXCEPTION_IF(!unpack_extra_multisig_info(info, signers, pkeys),
error::wallet_internal_error, "Bad extra multisig info");
return exchange_multisig_keys(password, pkeys, signers);
}
std::string wallet2::exchange_multisig_keys(const epee::wipeable_string &password,
std::unordered_set<crypto::public_key> derivations,
std::vector<crypto::public_key> signers)
{
CHECK_AND_ASSERT_THROW_MES(!derivations.empty(), "empty pkeys");
CHECK_AND_ASSERT_THROW_MES(!signers.empty(), "empty signers");
bool ready = false;
CHECK_AND_ASSERT_THROW_MES(multisig(&ready), "The wallet is not multisig");
CHECK_AND_ASSERT_THROW_MES(!ready, "Multisig wallet creation process has already been finished");
// keys are decrypted
epee::misc_utils::auto_scope_leave_caller keys_reencryptor;
if (m_ask_password == AskPasswordToDecrypt && !m_unattended && !m_watch_only)
{
crypto::chacha_key chacha_key;
crypto::generate_chacha_key(password.data(), password.size(), chacha_key, m_kdf_rounds);
m_account.encrypt_viewkey(chacha_key);
m_account.decrypt_keys(chacha_key);
keys_reencryptor = epee::misc_utils::create_scope_leave_handler([&, this, chacha_key]() { m_account.encrypt_keys(chacha_key); m_account.decrypt_viewkey(chacha_key); });
}
if (m_multisig_rounds_passed == multisig_rounds_required(m_multisig_signers.size(), m_multisig_threshold) - 1)
{
// the last round is passed and we have to calculate spend public key
// add ours if not included
crypto::public_key local_signer = get_multisig_signer_public_key();
if (std::find(signers.begin(), signers.end(), local_signer) == signers.end())
{
signers.push_back(local_signer);
for (const auto &msk: get_account().get_multisig_keys())
{
derivations.insert(rct::rct2pk(rct::scalarmultBase(rct::sk2rct(msk))));
}
}
CHECK_AND_ASSERT_THROW_MES(signers.size() == m_multisig_signers.size(), "Bad signers size");
// Summing all of unique public multisig keys to calculate common public spend key
crypto::public_key spend_public_key = cryptonote::generate_multisig_M_N_spend_public_key(std::vector<crypto::public_key>(derivations.begin(), derivations.end()));
m_account_public_address.m_spend_public_key = spend_public_key;
m_account.finalize_multisig(spend_public_key);
m_multisig_signers = signers;
std::sort(m_multisig_signers.begin(), m_multisig_signers.end(), [](const crypto::public_key &e0, const crypto::public_key &e1){ return memcmp(&e0, &e1, sizeof(e0)); });
++m_multisig_rounds_passed;
m_multisig_derivations.clear();
// keys are encrypted again
keys_reencryptor = epee::misc_utils::auto_scope_leave_caller();
if (!m_wallet_file.empty())
{
bool r = store_keys(m_keys_file, password, false);
THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file);
if (boost::filesystem::exists(m_wallet_file + ".address.txt"))
{
r = file_io_utils::save_string_to_file(m_wallet_file + ".address.txt", m_account.get_public_address_str(m_nettype));
if(!r) MERROR("String with address text not saved");
}
}
m_subaddresses.clear();
m_subaddress_labels.clear();
add_subaddress_account(tr("Primary account"));
if (!m_wallet_file.empty())
store();
return {};
}
// Below are either middle or secret spend key establishment rounds
for (const auto& key: m_multisig_derivations)
derivations.erase(key);
// Deriving multisig keys (set of Mi = b * Bi) according to DH from other participants' multisig keys.
auto new_derivations = cryptonote::generate_multisig_derivations(get_account().get_keys(), std::vector<crypto::public_key>(derivations.begin(), derivations.end()));
std::string extra_multisig_info;
if (m_multisig_rounds_passed == multisig_rounds_required(m_multisig_signers.size(), m_multisig_threshold) - 2) // next round is last
{
// Next round is last therefore we are performing secret spend establishment round as described above.
MINFO("Creating spend key...");
// Calculating our secret multisig keys by hashing our public multisig keys.
auto multisig_keys = cryptonote::calculate_multisig_keys(std::vector<crypto::public_key>(new_derivations.begin(), new_derivations.end()));
// And summing it to get personal secret spend key
crypto::secret_key spend_skey = cryptonote::calculate_multisig_signer_key(multisig_keys);
m_account.make_multisig(m_account.get_keys().m_view_secret_key, spend_skey, rct::rct2pk(rct::identity()), multisig_keys);
// Packing public multisig keys to exchange with others and calculate common public spend key in the last round
extra_multisig_info = pack_multisignature_keys(MULTISIG_EXTRA_INFO_MAGIC, secret_keys_to_public_keys(multisig_keys), spend_skey);
}
else
{
// This is just middle round
MINFO("Preparing keys for next exchange round...");
extra_multisig_info = pack_multisignature_keys(MULTISIG_EXTRA_INFO_MAGIC, new_derivations, m_account.get_keys().m_spend_secret_key);
m_multisig_derivations = new_derivations;
}
++m_multisig_rounds_passed;
create_keys_file(m_wallet_file, false, password, boost::filesystem::exists(m_wallet_file + ".address.txt"));
return extra_multisig_info;
}
void wallet2::unpack_multisig_info(const std::vector<std::string>& info,
std::vector<crypto::public_key> &public_keys,
std::vector<crypto::secret_key> &secret_keys) const
{
// parse all multisig info
std::vector<crypto::secret_key> secret_keys(info.size());
std::vector<crypto::public_key> public_keys(info.size());
public_keys.resize(info.size());
secret_keys.resize(info.size());
for (size_t i = 0; i < info.size(); ++i)
{
THROW_WALLET_EXCEPTION_IF(!verify_multisig_info(info[i], secret_keys[i], public_keys[i]),
@@ -4011,75 +4242,51 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
"Found local spend public key, but not local view secret key - something very weird");
}
}
}
std::string wallet2::make_multisig(const epee::wipeable_string &password,
const std::vector<std::string> &info,
uint32_t threshold)
{
std::vector<crypto::secret_key> secret_keys(info.size());
std::vector<crypto::public_key> public_keys(info.size());
unpack_multisig_info(info, public_keys, secret_keys);
return make_multisig(password, secret_keys, public_keys, threshold);
}
bool wallet2::finalize_multisig(const epee::wipeable_string &password, std::unordered_set<crypto::public_key> pkeys, std::vector<crypto::public_key> signers)
{
CHECK_AND_ASSERT_THROW_MES(!pkeys.empty(), "empty pkeys");
exchange_multisig_keys(password, pkeys, signers);
return true;
}
// keys are decrypted
epee::misc_utils::auto_scope_leave_caller keys_reencryptor;
if (m_ask_password == AskPasswordToDecrypt && !m_unattended && !m_watch_only)
bool wallet2::unpack_extra_multisig_info(const std::vector<std::string>& info,
std::vector<crypto::public_key> &signers,
std::unordered_set<crypto::public_key> &pkeys) const
{
// parse all multisig info
signers.resize(info.size(), crypto::null_pkey);
for (size_t i = 0; i < info.size(); ++i)
{
crypto::chacha_key chacha_key;
crypto::generate_chacha_key(password.data(), password.size(), chacha_key, m_kdf_rounds);
m_account.encrypt_viewkey(chacha_key);
m_account.decrypt_keys(chacha_key);
keys_reencryptor = epee::misc_utils::create_scope_leave_handler([&, this, chacha_key]() { m_account.encrypt_keys(chacha_key); m_account.decrypt_viewkey(chacha_key); });
if (!verify_extra_multisig_info(info[i], pkeys, signers[i]))
{
return false;
}
}
// add ours if not included
crypto::public_key local_signer;
CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(get_account().get_keys().m_spend_secret_key, local_signer),
"Failed to derive public spend key");
if (std::find(signers.begin(), signers.end(), local_signer) == signers.end())
{
signers.push_back(local_signer);
for (const auto &msk: get_account().get_multisig_keys())
{
pkeys.insert(rct::rct2pk(rct::scalarmultBase(rct::sk2rct(msk))));
}
}
CHECK_AND_ASSERT_THROW_MES(signers.size() == m_multisig_signers.size(), "Bad signers size");
crypto::public_key spend_public_key = cryptonote::generate_multisig_N1_N_spend_public_key(std::vector<crypto::public_key>(pkeys.begin(), pkeys.end()));
m_account_public_address.m_spend_public_key = spend_public_key;
m_account.finalize_multisig(spend_public_key);
m_multisig_signers = signers;
std::sort(m_multisig_signers.begin(), m_multisig_signers.end(), [](const crypto::public_key &e0, const crypto::public_key &e1){ return memcmp(&e0, &e1, sizeof(e0)); });
// keys are encrypted again
keys_reencryptor = epee::misc_utils::auto_scope_leave_caller();
create_keys_file(m_wallet_file, false, password, boost::filesystem::exists(m_wallet_file + ".address.txt"));
m_subaddresses.clear();
m_subaddress_labels.clear();
add_subaddress_account(tr("Primary account"));
if (!m_wallet_file.empty())
store();
return true;
}
bool wallet2::finalize_multisig(const epee::wipeable_string &password, const std::vector<std::string> &info)
{
// parse all multisig info
std::unordered_set<crypto::public_key> public_keys;
std::vector<crypto::public_key> signers(info.size(), crypto::null_pkey);
for (size_t i = 0; i < info.size(); ++i)
std::vector<crypto::public_key> signers;
if (!unpack_extra_multisig_info(info, signers, public_keys))
{
if (!verify_extra_multisig_info(info[i], public_keys, signers[i]))
{
MERROR("Bad multisig info");
return false;
}
MERROR("Bad multisig info");
return false;
}
return finalize_multisig(password, public_keys, signers);
}
@@ -4142,14 +4349,13 @@ bool wallet2::verify_multisig_info(const std::string &data, crypto::secret_key &
bool wallet2::verify_extra_multisig_info(const std::string &data, std::unordered_set<crypto::public_key> &pkeys, crypto::public_key &signer)
{
const size_t header_len = strlen("MultisigxV1");
if (data.size() < header_len || data.substr(0, header_len) != "MultisigxV1")
if (data.size() < MULTISIG_EXTRA_INFO_MAGIC.size() || data.substr(0, MULTISIG_EXTRA_INFO_MAGIC.size()) != MULTISIG_EXTRA_INFO_MAGIC)
{
MERROR("Multisig info header check error");
return false;
}
std::string decoded;
if (!tools::base58::decode(data.substr(header_len), decoded))
if (!tools::base58::decode(data.substr(MULTISIG_EXTRA_INFO_MAGIC.size()), decoded))
{
MERROR("Multisig info decoding error");
return false;