node.h

// Copyright (c) 2018-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_INTERFACES_NODE_H
#define BITCOIN_INTERFACES_NODE_H

#include <common/settings.h>
#include <consensus/amount.h>          // For CAmount
#include <net.h>                       // For NodeId
#include <net_types.h>                 // For banmap_t
#include <netaddress.h>                // For Network
#include <netbase.h>                   // For ConnectionDirection
#include <pubkey.h>                    // For CKeyID
#include <saltedhasher.h>              // For StaticSaltedHasher
#include <script/script.h>             // For CScript
#include <support/allocators/secure.h> // For SecureString
#include <uint256.h>
#include <util/translation.h>

#include <evo/types.h>
#include <interfaces/providertx.h>

#include <functional>
#include <memory>
#include <stddef.h>
#include <stdint.h>
#include <string>
#include <tuple>
#include <unordered_set>
#include <vector>

class BanMan;
class CBlockIndex;
class CDeterministicMNList;
class CFeeRate;
class CGovernanceObject;
class CGovernanceVote;
class CNodeStats;
class Coin;
class CService;
class RPCTimerInterface;
class UniValue;
class Proxy;
enum class SynchronizationState;
enum class TransactionError;
enum vote_signal_enum_t : int;
enum class MnType : uint16_t;
struct bilingual_str;
struct CNodeStateStats;
namespace node {
struct NodeContext;
} // namespace node
namespace wallet {
class CCoinControl;
} // namespace wallet

namespace interfaces {
class Handler;
class Wallet; // forward declaration for type-safe wallet parameter
class WalletLoader;
namespace CoinJoin {
class Loader;
} // namespace CoinJoin
struct BlockTip;

//! One collateral share of a shared masternode (mirrors CCollateralShare).
struct MnShare
{
    CAmount amount{0};
    CScript scriptRefund;
    CScript scriptReward;
    CKeyID keyIDOwner;

    const CScript& rewardScript() const { return scriptReward.empty() ? scriptRefund : scriptReward; }
};

//! Interface for a masternode entry
class MnEntry
{
public:
    MnEntry(const CDeterministicMNCPtr& dmn) {}
    virtual ~MnEntry() {}

    MnEntry() = delete;

    virtual bool isBanned() const = 0;
    virtual CService getNetInfoPrimary() const = 0;
    //! Platform HTTPS (DAPI gateway) endpoints from the extended address
    //! list; empty for non-evo masternodes. Domain-based entries are
    //! skipped rather than resolved here — the first entry is always a
    //! CService, so an evonode never contributes an empty set.
    virtual std::vector<CService> getPlatformHTTPSAddrs() const = 0;
    virtual MnType getType() const = 0;
    virtual UniValue toJson() const = 0;
    virtual const CKeyID& getKeyIdOwner() const = 0;
    virtual const CKeyID& getKeyIdVoting() const = 0;
    virtual const COutPoint& getCollateralOutpoint() const = 0;
    virtual const CScript& getScriptPayout() const = 0;
    virtual std::vector<CScript> getScriptPayouts() const = 0;
    virtual const CScript& getScriptOperatorPayout() const = 0;
    virtual const int32_t& getLastPaidHeight() const = 0;
    virtual const int32_t& getPoSePenalty() const = 0;
    virtual const int32_t& getRegisteredHeight() const = 0;
    virtual const uint16_t& getOperatorReward() const = 0;
    virtual const uint256& getProTxHash() const = 0;
    virtual bool isShared() const { return false; }
    virtual std::vector<MnShare> getShares() const { return {}; }
    virtual const uint32_t& getEarlyPeriodBlocks() const { static const uint32_t value{0}; return value; }
    virtual const CAmount& getEarlyPenalty() const { static const CAmount value{0}; return value; }
};

using MnEntryCPtr = std::shared_ptr<const MnEntry>;

//! Interface for a list of masternode entries
class MnList
{
public:
    MnList(const CDeterministicMNList& mn_list) {}
    virtual ~MnList() {}

    MnList() = delete;

    struct Counts {
        size_t m_total_evo{0};
        size_t m_total_mn{0};
        size_t m_total_weighted{0};
        size_t m_valid_evo{0};
        size_t m_valid_mn{0};
        size_t m_valid_weighted{0};

        [[nodiscard]] size_t total() const { return m_total_mn + m_total_evo; }
        [[nodiscard]] size_t enabled() const { return m_valid_mn + m_valid_evo; }
    };
    virtual Counts getCounts() const = 0;
    virtual int32_t getHeight() const = 0;
    virtual uint256 getBlockHash() const = 0;

    virtual void forEachMN(bool only_valid, std::function<void(const MnEntryCPtr&)> cb) const = 0;
    virtual std::vector<MnEntryCPtr> getProjectedMNPayees(const CBlockIndex* pindex) const = 0;

    virtual void setContext(node::NodeContext* context) = 0;
};

using MnListPtr = std::shared_ptr<MnList>;

//! Interface for the src/evo part of a dash node (dashd process).
class EVO
{
public:
    virtual ~EVO() {}
    virtual std::pair<MnListPtr, const CBlockIndex*> getListAtChainTip() = 0;
    virtual ProviderTxCapabilities getProviderTxCapabilities() = 0;
    //! Validate provider endpoints against a capability snapshot without changing node or wallet state or
    //! taking cs_main. Transaction creation validates them again against the then-active rules.
    virtual std::optional<ProviderTxError> validateProviderNetInfo(const ProviderNetInfo& net_info, MnType type,
                                                                   uint16_t version, bool ipv4_optional,
                                                                   bool optional) = 0;
    //! The first endpoint a masternode at the chain tip already uses, which a
    //! registration with a new collateral cannot reuse. Nothing is reported for
    //! endpoints validateProviderNetInfo refuses.
    virtual std::optional<std::string> findProviderNetInfoInUse(const ProviderNetInfo& net_info, MnType type,
                                                                uint16_t version, bool ipv4_optional) = 0;
    //! Successful registration with an existing collateral leaves that coin locked,
    //! including when the signed transaction is returned without submission.
    virtual ProviderTxResult<ProviderTxSubmission> registerMasternode(Wallet& wallet,
                                                                      const ProviderRegistrationRequest& request) = 0;
    //! Successful preparation leaves existing collateral locked. The result identifies
    //! whether this call acquired the lock so a discarded flow cannot unlock an older lock.
    virtual ProviderTxResult<PreparedProviderRegistration> prepareMasternodeRegistration(
        Wallet& wallet, const ProviderRegistrationRequest& request) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> submitMasternodeRegistration(
        Wallet& wallet, const CTransactionRef& tx, const std::vector<unsigned char>& collateral_signature) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> updateMasternodeService(Wallet& wallet,
                                                                           const ProviderUpdateServiceRequest& request) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> updateMasternodeRegistrar(
        Wallet& wallet, const ProviderUpdateRegistrarRequest& request) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> revokeMasternode(Wallet& wallet,
                                                                    const ProviderRevokeRequest& request) = 0;
    virtual ProviderTxResult<PreparedSharedRegistration> prepareSharedRegistration(
        const SharedRegistrationRequest& request) = 0;
    virtual ProviderTxResult<SharedSignResult> signShared(Wallet& wallet, const SharedSignRequest& request) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> combineShared(Wallet& wallet, const SharedCombineRequest& request) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> dissolveShared(Wallet& wallet,
                                                                  const SharedDissolveRequest& request) = 0;
    virtual ProviderTxResult<PreparedSharedConsent> prepareSharedDissolution(
        const SharedDissolvePrepareRequest& request) = 0;
    virtual ProviderTxResult<ProviderTxSubmission> updateShare(Wallet& wallet, const SharedUpdateShareRequest& request) = 0;
    virtual ProviderTxResult<PreparedSharedConsent> prepareSharedRegistrarUpdate(
        Wallet& wallet, const SharedRegistrarUpdatePrepareRequest& request) = 0;
    virtual void setContext(node::NodeContext* context) {}
};

//! Interface for the src/governance part of a dash node (dashd process).
class GOV
{
public:
    virtual ~GOV() {}
    virtual void getAllNewerThan(std::vector<CGovernanceObject> &objs, int64_t nMoreThanTime, bool include_postponed = false) = 0;
    struct Votes {
        int32_t m_abs{0};
        int32_t m_no{0};
        int32_t m_yes{0};
    };
    virtual Votes getObjVotes(const CGovernanceObject& obj, vote_signal_enum_t vote_signal) = 0;
    struct UniqueVoters {
        uint16_t m_regular{0};
        uint16_t m_evo{0};
    };
    virtual UniqueVoters getObjUniqueVoters(const CGovernanceObject& obj, vote_signal_enum_t vote_signal) = 0;
    virtual std::vector<CGovernanceVote> getCurrentVotes(const uint256& hash) = 0;
    virtual bool existsObj(const uint256& hash) = 0;
    virtual bool isEnabled() = 0;
    virtual bool processVoteAndRelay(const CGovernanceVote& vote, std::string& error) = 0;
    struct GovernanceInfo {
        CAmount proposalfee{0};
        int superblockcycle{0};
        int superblockmaturitywindow{0};
        int lastsuperblock{0};
        int nextsuperblock{0};
        int fundingthreshold{0};
        CAmount governancebudget{0};
        int64_t targetSpacing{0};
        int relayRequiredConfs{1};
        int requiredConfs{6};
    };
    virtual GovernanceInfo getGovernanceInfo() = 0;
    virtual std::optional<int32_t> getProposalFundedHeight(const uint256& proposal_hash) = 0;
    struct FundableResult {
        std::unordered_set<uint256, StaticSaltedHasher> hashes;
        CAmount allocated{0};
    };
    virtual FundableResult getFundableProposalHashes() = 0;
    virtual std::optional<CGovernanceObject> createProposal(int32_t revision, int64_t created_time,
                                const std::string& data_hex, std::string& error) = 0;
    virtual bool submitProposal(const uint256& parent, int32_t revision, int64_t created_time, const std::string& data_hex,
                                const uint256& fee_txid, std::string& out_object_hash, std::string& error) = 0;
    virtual void setContext(node::NodeContext* context) {}
};

//! Interface for the src/llmq part of a dash node (dashd process).
class LLMQ
{
public:
    virtual ~LLMQ() {}
    struct ChainLockInfo {
        int32_t m_height{0};
        int64_t m_block_time{0};
        uint256 m_hash{};
    };
    virtual ChainLockInfo getBestChainLock() = 0;
    struct CreditPoolCounts {
        CAmount m_diff{0};
        CAmount m_limit{0};
        CAmount m_locked{0};
    };
    virtual CreditPoolCounts getCreditPoolCounts() = 0;
    struct InstantSendCounts {
        size_t m_verified{0};
        size_t m_unverified{0};
        size_t m_awaiting_tx{0};
        size_t m_unprotected_tx{0};
    };
    virtual InstantSendCounts getInstantSendCounts() = 0;
    virtual size_t getPendingAssetUnlocks() = 0;
    struct QuorumInfo {
        std::string m_name;
        size_t m_count{0};
        double m_health{0.0};
        bool m_rotates{false};
        int32_t m_data_retention_blocks{0};
        int32_t m_newest_height{0};
        int32_t m_expiry_height{0};
    };
    virtual std::vector<QuorumInfo> getQuorumStats() = 0;
    struct PlatformQuorum {
        uint256 m_quorum_hash{};
        std::vector<uint8_t> m_pubkey{}; //!< serialized BLS public key (basic scheme)
        int32_t m_height{0};
    };
    //! Locally retained quorums of the given LLMQ type with their public
    //! keys. Used by the GUI Platform client to verify Platform state-root
    //! quorum signatures against locally synced quorum data. This includes
    //! retained signing quorums that are no longer in the active signing set.
    virtual std::vector<PlatformQuorum> getPlatformQuorums(uint8_t llmq_type) = 0;
    //! Serialized InstantSend lock for the given txid, or empty if the
    //! transaction has no islock (used to build asset lock proofs).
    virtual std::vector<uint8_t> getInstantSendLock(const uint256& txid) = 0;
    virtual void setContext(node::NodeContext* context) {}
};

//! Interface for the src/masternode part of a dash node (dashd process).
namespace Masternode
{
class Sync
{
public:
    virtual ~Sync() {}
    virtual bool isBlockchainSynced() = 0;
    virtual bool isGovernanceSynced() = 0;
    virtual bool isSynced() = 0;
    virtual std::string getSyncStatus() =  0;
    virtual void setContext(node::NodeContext* context) {}
};
}

namespace CoinJoin {
//! Interface for the global coinjoin options in src/coinjoin
class Options
{
public:
    virtual int getSessions() = 0;
    virtual int getRounds() = 0;
    virtual int getAmount() = 0;
    virtual int getDenomsGoal() = 0;
    virtual int getDenomsHardCap() = 0;

    virtual void setEnabled(bool fEnabled) = 0;
    virtual void setMultiSessionEnabled(bool fEnabled) = 0;
    virtual void setSessions(int sessions) = 0;
    virtual void setRounds(int nRounds) = 0;
    virtual void setAmount(CAmount amount) = 0;
    virtual void setDenomsGoal(int denoms_goal) = 0;
    virtual void setDenomsHardCap(int denoms_hardcap) = 0;

    virtual bool isMultiSessionEnabled() = 0;
    virtual bool isEnabled() = 0;
    // Static helpers
    virtual bool isCollateralAmount(CAmount nAmount) = 0;
    virtual CAmount getMinCollateralAmount() = 0;
    virtual CAmount getMaxCollateralAmount() = 0;
    virtual CAmount getSmallestDenomination() = 0;
    virtual bool isDenominated(CAmount nAmount) = 0;
    virtual std::array<CAmount, 5> getStandardDenominations() = 0;
};
}

//! Block and header tip information
struct BlockAndHeaderTipInfo
{
    int block_height;
    int64_t block_time;
    uint256 block_hash;
    int header_height;
    int64_t header_time;
    double verification_progress;
};

//! External signer interface used by the GUI.
class ExternalSigner
{
public:
    virtual ~ExternalSigner() {};

    //! Get signer display name
    virtual std::string getName() = 0;
};

//! Top-level interface for a dash node (dashd process).
class Node
{
public:
    virtual ~Node() {}

    //! Init logging.
    virtual void initLogging() = 0;

    //! Init parameter interaction.
    virtual void initParameterInteraction() = 0;

    //! Get warnings.
    virtual bilingual_str getWarnings() = 0;

    //! Get exit status.
    virtual int getExitStatus() = 0;

    // Get log flags.
    virtual uint64_t getLogCategories() = 0;

    //! Initialize app dependencies.
    virtual bool baseInitialize() = 0;

    //! Start node.
    virtual bool appInitMain(interfaces::BlockAndHeaderTipInfo* tip_info = nullptr) = 0;

    //! Stop node.
    virtual void appShutdown() = 0;

    //! Prepare shutdown.
    virtual void appPrepareShutdown() = 0;

    //! Start shutdown.
    virtual void startShutdown() = 0;

    //! Return whether shutdown was requested.
    virtual bool shutdownRequested() = 0;

    //! Return whether a particular setting in <datadir>/settings.json is or
    //! would be ignored because it is also specified in the command line.
    virtual bool isSettingIgnored(const std::string& name) = 0;

    //! Return setting value from <datadir>/settings.json or dash.conf.
    virtual common::SettingsValue getPersistentSetting(const std::string& name) = 0;

    //! Update a setting in <datadir>/settings.json.
    virtual void updateRwSetting(const std::string& name, const common::SettingsValue& value) = 0;

    //! Force a setting value to be applied, overriding any other configuration
    //! source, but not being persisted.
    virtual void forceSetting(const std::string& name, const common::SettingsValue& value) = 0;

    //! Clear all settings in <datadir>/settings.json and store a backup of
    //! previous settings in <datadir>/settings.json.bak.
    virtual void resetSettings() = 0;

    //! Map port.
    virtual void mapPort(bool use_upnp, bool use_natpmp) = 0;

    //! Get proxy.
    virtual bool getProxy(Network net, Proxy& proxy_info) = 0;

    //! Get number of connections.
    virtual size_t getNodeCount(ConnectionDirection flags) = 0;

    //! Get stats for connected nodes.
    using NodesStats = std::vector<std::tuple<CNodeStats, bool, CNodeStateStats>>;
    virtual bool getNodesStats(NodesStats& stats) = 0;

    //! Get ban map entries.
    virtual bool getBanned(banmap_t& banmap) = 0;

    //! Ban node.
    virtual bool ban(const CNetAddr& net_addr, int64_t ban_time_offset) = 0;

    //! Unban node.
    virtual bool unban(const CSubNet& ip) = 0;

    //! Disconnect node by address.
    virtual bool disconnectByAddress(const CNetAddr& net_addr) = 0;

    //! Disconnect node by id.
    virtual bool disconnectById(NodeId id) = 0;

    //! Return list of external signers (attached devices which can sign transactions).
    virtual std::vector<std::unique_ptr<ExternalSigner>> listExternalSigners() = 0;

    //! Get total bytes recv.
    virtual int64_t getTotalBytesRecv() = 0;

    //! Get total bytes sent.
    virtual int64_t getTotalBytesSent() = 0;

    //! Get mempool size.
    virtual size_t getMempoolSize() = 0;

    //! Get mempool dynamic usage.
    virtual size_t getMempoolDynamicUsage() = 0;

    //! Get mempool maximum memory usage.
    virtual size_t getMempoolMaxUsage() = 0;

    //! Get header tip height and time.
    virtual bool getHeaderTip(int& height, int64_t& block_time) = 0;

    //! Get num blocks.
    virtual int getNumBlocks() = 0;

    //! Get network local addresses.
    virtual std::map<CNetAddr, LocalServiceInfo> getNetLocalAddresses() = 0;

    //! Get best block hash.
    virtual uint256 getBestBlockHash() = 0;

    //! Get last block time.
    virtual int64_t getLastBlockTime() = 0;

    //! Get last block hash.
    virtual std::string getLastBlockHash() = 0;

    //! Get verification progress.
    virtual double getVerificationProgress() = 0;

    //! Is initial block download.
    virtual bool isInitialBlockDownload() = 0;

    //! Is masternode.
    virtual bool isMasternode() = 0;

    //! Is loading blocks.
    virtual bool isLoadingBlocks() = 0;

    //! Whether the v24 hard fork rules are active at the chain tip.
    virtual bool isV24Active() = 0;

    //! Set network active.
    virtual void setNetworkActive(bool active) = 0;

    //! Get network active.
    virtual bool getNetworkActive() = 0;

    //! Get dust relay fee.
    virtual CFeeRate getDustRelayFee() = 0;

    //! Execute rpc command.
    virtual UniValue executeRpc(const std::string& command, const UniValue& params, const std::string& uri) = 0;

    //! List rpc commands.
    virtual std::vector<std::string> listRpcCommands() = 0;

    //! Set RPC timer interface if unset.
    virtual void rpcSetTimerInterfaceIfUnset(RPCTimerInterface* iface) = 0;

    //! Unset RPC timer interface.
    virtual void rpcUnsetTimerInterface(RPCTimerInterface* iface) = 0;

    //! Get unspent outputs associated with a transaction.
    virtual bool getUnspentOutput(const COutPoint& output, Coin& coin) = 0;

    //! Broadcast transaction.
    virtual TransactionError broadcastTransaction(CTransactionRef tx, CAmount max_tx_fee, bilingual_str& err_string) = 0;

    //! Get wallet loader.
    virtual WalletLoader& walletLoader() = 0;

    //! Return interface for accessing evo related handler.
    virtual EVO& evo() = 0;

    //! Return interface for accessing governance related handler.
    virtual GOV& gov() = 0;

    //! Return interface for accessing llmq related handler.
    virtual LLMQ& llmq() = 0;

    //! Return interface for accessing masternode related handler.
    virtual Masternode::Sync& masternodeSync() = 0;

    //! Return interface for accessing coinjoin options related handler.
    virtual CoinJoin::Options& coinJoinOptions() = 0;

    //! Return interface for accessing coinjoin loader handler.
    virtual std::unique_ptr<interfaces::CoinJoin::Loader>& coinJoinLoader() = 0;

    //! Register handler for init messages.
    using InitMessageFn = std::function<void(const std::string& message)>;
    virtual std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) = 0;

    //! Register handler for message box messages.
    using MessageBoxFn =
        std::function<bool(const bilingual_str& message, const std::string& caption, unsigned int style)>;
    virtual std::unique_ptr<Handler> handleMessageBox(MessageBoxFn fn) = 0;

    //! Register handler for question messages.
    using QuestionFn = std::function<bool(const bilingual_str& message,
        const std::string& non_interactive_message,
        const std::string& caption,
        unsigned int style)>;
    virtual std::unique_ptr<Handler> handleQuestion(QuestionFn fn) = 0;

    //! Register handler for progress messages.
    using ShowProgressFn = std::function<void(const std::string& title, int progress, bool resume_possible)>;
    virtual std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) = 0;

    //! Register handler for wallet client constructed messages.
    using InitWalletFn = std::function<void()>;
    virtual std::unique_ptr<Handler> handleInitWallet(InitWalletFn fn) = 0;

    //! Register handler for number of connections changed messages.
    using NotifyNumConnectionsChangedFn = std::function<void(int new_num_connections)>;
    virtual std::unique_ptr<Handler> handleNotifyNumConnectionsChanged(NotifyNumConnectionsChangedFn fn) = 0;

    //! Register handler for network active messages.
    using NotifyNetworkActiveChangedFn = std::function<void(bool network_active)>;
    virtual std::unique_ptr<Handler> handleNotifyNetworkActiveChanged(NotifyNetworkActiveChangedFn fn) = 0;

    //! Register handler for notify alert messages.
    using NotifyAlertChangedFn = std::function<void()>;
    virtual std::unique_ptr<Handler> handleNotifyAlertChanged(NotifyAlertChangedFn fn) = 0;

    //! Register handler for ban list messages.
    using BannedListChangedFn = std::function<void()>;
    virtual std::unique_ptr<Handler> handleBannedListChanged(BannedListChangedFn fn) = 0;

    //! Register handler for block tip messages.
    using NotifyBlockTipFn =
        std::function<void(SynchronizationState, interfaces::BlockTip tip, double verification_progress)>;
    virtual std::unique_ptr<Handler> handleNotifyBlockTip(NotifyBlockTipFn fn) = 0;

    //! Register handler for chainlock messages.
    using NotifyChainLockFn =
    std::function<void(const std::string& bestChainLockedHash, int32_t bestChainLockedHeight)>;
    virtual std::unique_ptr<Handler> handleNotifyChainLock(NotifyChainLockFn fn) = 0;

    //! Register handler for header tip messages.
    using NotifyHeaderTipFn =
        std::function<void(SynchronizationState, interfaces::BlockTip tip)>;
    virtual std::unique_ptr<Handler> handleNotifyHeaderTip(NotifyHeaderTipFn fn) = 0;

    //! Register handler for InstantSend data messages.
    using NotifyInstantSendChangedFn = std::function<void()>;
    virtual std::unique_ptr<Handler> handleNotifyInstantSendChanged(NotifyInstantSendChangedFn fn) = 0;

    //! Register handler for governance data messages.
    using NotifyGovernanceChangedFn = std::function<void()>;
    virtual std::unique_ptr<Handler> handleNotifyGovernanceChanged(NotifyGovernanceChangedFn fn) = 0;

    //! Register handler for masternode list update messages.
    using NotifyMasternodeListChangedFn =
        std::function<void(const CDeterministicMNList& newList,
                const CBlockIndex* pindex)>;
    virtual std::unique_ptr<Handler> handleNotifyMasternodeListChanged(NotifyMasternodeListChangedFn fn) = 0;

    //! Register handler for additional data sync progress update messages.
    using NotifyAdditionalDataSyncProgressChangedFn =
        std::function<void(double nSyncProgress)>;
    virtual std::unique_ptr<Handler> handleNotifyAdditionalDataSyncProgressChanged(NotifyAdditionalDataSyncProgressChangedFn fn) = 0;

    //! Get and set internal node context. Useful for testing, but not
    //! accessible across processes.
    virtual node::NodeContext* context() { return nullptr; }
    virtual void setContext(node::NodeContext* context) { }
};

//! Return implementation of Node interface.
std::unique_ptr<Node> MakeNode(node::NodeContext& context);

//! Block tip (could be a header or not, depends on the subscribed signal).
struct BlockTip {
    int block_height;
    int64_t block_time;
    uint256 block_hash;
};
} // namespace interfaces

#endif // BITCOIN_INTERFACES_NODE_H