Convert remaining comments in /src to doxygen format

- Update comments in checkpoints to be doxygen compatible
- Update comments in checkqueue to be doxygen compatible
- Update coins to be doxygen compatible
- Fix comment typo in crypter.h
- Update licenses/copyright dates

Closes #5325 #5184 #5183 #5182

19 files changed, 269 insertions, 225 deletions

diff --git a/src/base58.cpp b/src/base58.cpp
index d94db2c51b..c594993ea0 100644
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "base58.h"
@@ -15,7 +15,7 @@
 #include <boost/variant/apply_visitor.hpp>
 #include <boost/variant/static_visitor.hpp>
 
-/* All alphanumeric characters except for "0", "I", "O", and "l" */
+/** All alphanumeric characters except for "0", "I", "O", and "l" */
 static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
 
 bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch)
diff --git a/src/base58.h b/src/base58.h
index 7cd2d651a1..c4cb96814c 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -1,16 +1,16 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-//
-// Why base-58 instead of standard base-64 encoding?
-// - Don't want 0OIl characters that look the same in some fonts and
-//      could be used to create visually identical looking account numbers.
-// - A string with non-alphanumeric characters is not as easily accepted as an account number.
-// - E-mail usually won't line-break if there's no punctuation to break at.
-// - Double-clicking selects the whole number as one word if it's all alphanumeric.
-//
+/**
+ * Why base-58 instead of standard base-64 encoding?
+ * - Don't want 0OIl characters that look the same in some fonts and
+ *      could be used to create visually identical looking account numbers.
+ * - A string with non-alphanumeric characters is not as easily accepted as an account number.
+ * - E-mail usually won't line-break if there's no punctuation to break at.
+ * - Double-clicking selects the whole number as one word if it's all alphanumeric.
+ */
 #ifndef BITCOIN_BASE58_H
 #define BITCOIN_BASE58_H
 
@@ -70,10 +70,10 @@ inline bool DecodeBase58Check(const std::string& str, std::vector<unsigned char>
 class CBase58Data
 {
 protected:
-    // the version byte(s)
+    //! the version byte(s)
     std::vector<unsigned char> vchVersion;
 
-    // the actually encoded data
+    //! the actually encoded data
     typedef std::vector<unsigned char, zero_after_free_allocator<unsigned char> > vector_uchar;
     vector_uchar vchData;
 
diff --git a/src/bloom.cpp b/src/bloom.cpp
index df8cedaf6a..07b8f2c0ae 100644
--- a/src/bloom.cpp
+++ b/src/bloom.cpp
@@ -1,5 +1,5 @@
-// Copyright (c) 2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2012-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "bloom.h"
@@ -21,13 +21,17 @@
 using namespace std;
 
 CBloomFilter::CBloomFilter(unsigned int nElements, double nFPRate, unsigned int nTweakIn, unsigned char nFlagsIn) :
-// The ideal size for a bloom filter with a given number of elements and false positive rate is:
-// - nElements * log(fp rate) / ln(2)^2
-// We ignore filter parameters which will create a bloom filter larger than the protocol limits
+/**
+ * The ideal size for a bloom filter with a given number of elements and false positive rate is:
+ * - nElements * log(fp rate) / ln(2)^2
+ * We ignore filter parameters which will create a bloom filter larger than the protocol limits
+ */
 vData(min((unsigned int)(-1  / LN2SQUARED * nElements * log(nFPRate)), MAX_BLOOM_FILTER_SIZE * 8) / 8),
-// The ideal number of hash functions is filter size * ln(2) / number of elements
-// Again, we ignore filter parameters which will create a bloom filter with more hash functions than the protocol limits
-// See http://en.wikipedia.org/wiki/Bloom_filter for an explanation of these formulas
+/**
+ * The ideal number of hash functions is filter size * ln(2) / number of elements
+ * Again, we ignore filter parameters which will create a bloom filter with more hash functions than the protocol limits
+ * See https://en.wikipedia.org/wiki/Bloom_filter for an explanation of these formulas
+ */
 isFull(false),
 isEmpty(false),
 nHashFuncs(min((unsigned int)(vData.size() * 8 / nElements * LN2), MAX_HASH_FUNCS)),
diff --git a/src/bloom.h b/src/bloom.h
index 143e3b4c79..f54922edb9 100644
--- a/src/bloom.h
+++ b/src/bloom.h
@@ -1,5 +1,5 @@
-// Copyright (c) 2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2012-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_BLOOM_H
@@ -13,12 +13,14 @@ class COutPoint;
 class CTransaction;
 class uint256;
 
-// 20,000 items with fp rate < 0.1% or 10,000 items and <0.0001%
+//! 20,000 items with fp rate < 0.1% or 10,000 items and <0.0001%
 static const unsigned int MAX_BLOOM_FILTER_SIZE = 36000; // bytes
 static const unsigned int MAX_HASH_FUNCS = 50;
 
-// First two bits of nFlags control how much IsRelevantAndUpdate actually updates
-// The remaining bits are reserved
+/**
+ * First two bits of nFlags control how much IsRelevantAndUpdate actually updates
+ * The remaining bits are reserved
+ */
 enum bloomflags
 {
     BLOOM_UPDATE_NONE = 0,
@@ -52,13 +54,15 @@ private:
     unsigned int Hash(unsigned int nHashNum, const std::vector<unsigned char>& vDataToHash) const;
 
 public:
-    // Creates a new bloom filter which will provide the given fp rate when filled with the given number of elements
-    // Note that if the given parameters will result in a filter outside the bounds of the protocol limits,
-    // the filter created will be as close to the given parameters as possible within the protocol limits.
-    // This will apply if nFPRate is very low or nElements is unreasonably high.
-    // nTweak is a constant which is added to the seed value passed to the hash function
-    // It should generally always be a random value (and is largely only exposed for unit testing)
-    // nFlags should be one of the BLOOM_UPDATE_* enums (not _MASK)
+    /**
+     * Creates a new bloom filter which will provide the given fp rate when filled with the given number of elements
+     * Note that if the given parameters will result in a filter outside the bounds of the protocol limits,
+     * the filter created will be as close to the given parameters as possible within the protocol limits.
+     * This will apply if nFPRate is very low or nElements is unreasonably high.
+     * nTweak is a constant which is added to the seed value passed to the hash function
+     * It should generally always be a random value (and is largely only exposed for unit testing)
+     * nFlags should be one of the BLOOM_UPDATE_* enums (not _MASK)
+     */
     CBloomFilter(unsigned int nElements, double nFPRate, unsigned int nTweak, unsigned char nFlagsIn);
     CBloomFilter() : isFull(true), isEmpty(false), nHashFuncs(0), nTweak(0), nFlags(0) {}
 
@@ -82,14 +86,14 @@ public:
 
     void clear();
 
-    // True if the size is <= MAX_BLOOM_FILTER_SIZE and the number of hash functions is <= MAX_HASH_FUNCS
-    // (catch a filter which was just deserialized which was too big)
+    //! True if the size is <= MAX_BLOOM_FILTER_SIZE and the number of hash functions is <= MAX_HASH_FUNCS
+    //! (catch a filter which was just deserialized which was too big)
     bool IsWithinSizeConstraints() const;
 
-    // Also adds any outputs which match the filter to the filter (to match their spending txes)
+    //! Also adds any outputs which match the filter to the filter (to match their spending txes)
     bool IsRelevantAndUpdate(const CTransaction& tx);
 
-    // Checks for empty and full filters to avoid wasting cpu
+    //! Checks for empty and full filters to avoid wasting cpu
     void UpdateEmptyFull();
 };
 
diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index fbde47339d..0fb4411e63 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "checkpoints.h"
@@ -14,11 +14,13 @@
 
 namespace Checkpoints {
 
-    // How many times we expect transactions after the last checkpoint to
-    // be slower. This number is a compromise, as it can't be accurate for
-    // every system. When reindexing from a fast disk with a slow CPU, it
-    // can be up to 20, while when downloading from a slow network with a
-    // fast multicore CPU, it won't be much higher than 1.
+    /**
+     * How many times we expect transactions after the last checkpoint to
+     * be slower. This number is a compromise, as it can't be accurate for
+     * every system. When reindexing from a fast disk with a slow CPU, it
+     * can be up to 20, while when downloading from a slow network with a
+     * fast multicore CPU, it won't be much higher than 1.
+     */
     static const double SIGCHECK_VERIFICATION_FACTOR = 5.0;
 
     bool fEnabled = true;
@@ -35,7 +37,7 @@ namespace Checkpoints {
         return hash == i->second;
     }
 
-    // Guess how far we are in the verification process at the given block index
+    //! Guess how far we are in the verification process at the given block index
     double GuessVerificationProgress(CBlockIndex *pindex, bool fSigchecks) {
         if (pindex==NULL)
             return 0.0;
diff --git a/src/checkpoints.h b/src/checkpoints.h
index 847524a9f2..65c5165f0f 100644
--- a/src/checkpoints.h
+++ b/src/checkpoints.h
@@ -1,5 +1,5 @@
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_CHECKPOINTS_H
@@ -11,7 +11,8 @@
 
 class CBlockIndex;
 
-/** Block-chain checkpoints are compiled-in sanity checks.
+/** 
+ * Block-chain checkpoints are compiled-in sanity checks.
  * They are updated every release or three.
  */
 namespace Checkpoints
@@ -25,13 +26,13 @@ struct CCheckpointData {
     double fTransactionsPerDay;
 };
 
-// Returns true if block passes checkpoint checks
+//! Returns true if block passes checkpoint checks
 bool CheckBlock(int nHeight, const uint256& hash);
 
-// Return conservative estimate of total number of blocks, 0 if unknown
+//! Return conservative estimate of total number of blocks, 0 if unknown
 int GetTotalBlocksEstimate();
 
-// Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
+//! Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
 CBlockIndex* GetLastCheckpoint();
 
 double GuessVerificationProgress(CBlockIndex* pindex, bool fSigchecks = true);
diff --git a/src/checkqueue.h b/src/checkqueue.h
index afecfeede5..2ee46a1210 100644
--- a/src/checkqueue.h
+++ b/src/checkqueue.h
@@ -1,5 +1,5 @@
-// Copyright (c) 2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2012-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_CHECKQUEUE_H
@@ -16,7 +16,8 @@
 template <typename T>
 class CCheckQueueControl;
 
-/** Queue for verifications that have to be performed.
+/** 
+ * Queue for verifications that have to be performed.
   * The verifications are represented by a type T, which must provide an
   * operator(), returning a bool.
   *
@@ -29,40 +30,42 @@ template <typename T>
 class CCheckQueue
 {
 private:
-    // Mutex to protect the inner state
+    //! Mutex to protect the inner state
     boost::mutex mutex;
 
-    // Worker threads block on this when out of work
+    //! Worker threads block on this when out of work
     boost::condition_variable condWorker;
 
-    // Master thread blocks on this when out of work
+    //! Master thread blocks on this when out of work
     boost::condition_variable condMaster;
 
-    // The queue of elements to be processed.
-    // As the order of booleans doesn't matter, it is used as a LIFO (stack)
+    //! The queue of elements to be processed.
+    //! As the order of booleans doesn't matter, it is used as a LIFO (stack)
     std::vector<T> queue;
 
-    // The number of workers (including the master) that are idle.
+    //! The number of workers (including the master) that are idle.
     int nIdle;
 
-    // The total number of workers (including the master).
+    //! The total number of workers (including the master).
     int nTotal;
 
-    // The temporary evaluation result.
+    //! The temporary evaluation result.
     bool fAllOk;
 
-    // Number of verifications that haven't completed yet.
-    // This includes elements that are not anymore in queue, but still in
-    // worker's own batches.
+    /**
+     * Number of verifications that haven't completed yet.
+     * This includes elements that are not anymore in queue, but still in
+     * worker's own batches.
+     */
     unsigned int nTodo;
 
-    // Whether we're shutting down.
+    //! Whether we're shutting down.
     bool fQuit;
 
-    // The maximum number of elements to be processed in one batch
+    //! The maximum number of elements to be processed in one batch
     unsigned int nBatchSize;
 
-    // Internal function that does bulk of the verification work.
+    /** Internal function that does bulk of the verification work. */
     bool Loop(bool fMaster = false)
     {
         boost::condition_variable& cond = fMaster ? condMaster : condWorker;
@@ -124,22 +127,22 @@ private:
     }
 
 public:
-    // Create a new check queue
+    //! Create a new check queue
     CCheckQueue(unsigned int nBatchSizeIn) : nIdle(0), nTotal(0), fAllOk(true), nTodo(0), fQuit(false), nBatchSize(nBatchSizeIn) {}
 
-    // Worker thread
+    //! Worker thread
     void Thread()
     {
         Loop();
     }
 
-    // Wait until execution finishes, and return whether all evaluations where succesful.
+    //! Wait until execution finishes, and return whether all evaluations where successful.
     bool Wait()
     {
         return Loop(true);
     }
 
-    // Add a batch of checks to the queue
+    //! Add a batch of checks to the queue
     void Add(std::vector<T>& vChecks)
     {
         boost::unique_lock<boost::mutex> lock(mutex);
@@ -161,8 +164,9 @@ public:
     friend class CCheckQueueControl<T>;
 };
 
-/** RAII-style controller object for a CCheckQueue that guarantees the passed
- *  queue is finished before continuing.
+/** 
+ * RAII-style controller object for a CCheckQueue that guarantees the passed
+ * queue is finished before continuing.
  */
 template <typename T>
 class CCheckQueueControl
diff --git a/src/coins.cpp b/src/coins.cpp
index e4f3e67aeb..c2e802c953 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -1,5 +1,5 @@
-// Copyright (c) 2012-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2012-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "coins.h"
@@ -8,9 +8,11 @@
 
 #include <assert.h>
 
-// calculate number of bytes for the bitmask, and its number of non-zero bytes
-// each bit in the bitmask represents the availability of one output, but the
-// availabilities of the first two outputs are encoded separately
+/**
+ * calculate number of bytes for the bitmask, and its number of non-zero bytes
+ * each bit in the bitmask represents the availability of one output, but the
+ * availabilities of the first two outputs are encoded separately
+ */
 void CCoins::CalcMaskSize(unsigned int &nBytes, unsigned int &nNonzeroBytes) const {
     unsigned int nLastUsedByte = 0;
     for (unsigned int b = 0; 2+b*8 < vout.size(); b++) {
@@ -133,7 +135,7 @@ const CCoins* CCoinsViewCache::AccessCoins(const uint256 &txid) const {
 bool CCoinsViewCache::HaveCoins(const uint256 &txid) const {
     CCoinsMap::const_iterator it = FetchCoins(txid);
     // We're using vtx.empty() instead of IsPruned here for performance reasons,
-    // as we only care about the case where an transaction was replaced entirely
+    // as we only care about the case where a transaction was replaced entirely
     // in a reorganization (which wipes vout entirely, as opposed to spending
     // which just cleans individual outputs).
     return (it != cacheCoins.end() && !it->second.coins.vout.empty());
diff --git a/src/coins.h b/src/coins.h
index ee9051562b..dbe3f8bd31 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_COINS_H
@@ -17,7 +17,8 @@
 #include <boost/foreach.hpp>
 #include <boost/unordered_map.hpp>
 
-/** pruned version of CTransaction: only retains metadata and unspent transaction outputs
+/** 
+ * Pruned version of CTransaction: only retains metadata and unspent transaction outputs
  *
  * Serialized format:
  * - VARINT(nVersion)
@@ -71,17 +72,17 @@
 class CCoins
 {
 public:
-    // whether transaction is a coinbase
+    //! whether transaction is a coinbase
     bool fCoinBase;
 
-    // unspent transaction outputs; spent outputs are .IsNull(); spent outputs at the end of the array are dropped
+    //! unspent transaction outputs; spent outputs are .IsNull(); spent outputs at the end of the array are dropped
     std::vector<CTxOut> vout;
 
-    // at which height this transaction was included in the active block chain
+    //! at which height this transaction was included in the active block chain
     int nHeight;
 
-    // version of the CTransaction; accesses to this value should probably check for nHeight as well,
-    // as new tx version will probably only be introduced at certain heights
+    //! version of the CTransaction; accesses to this value should probably check for nHeight as well,
+    //! as new tx version will probably only be introduced at certain heights
     int nVersion;
 
     void FromTx(const CTransaction &tx, int nHeightIn) {
@@ -92,7 +93,7 @@ public:
         ClearUnspendable();
     }
 
-    // construct a CCoins from a CTransaction, at a given height
+    //! construct a CCoins from a CTransaction, at a given height
     CCoins(const CTransaction &tx, int nHeightIn) {
         FromTx(tx, nHeightIn);
     }
@@ -104,10 +105,10 @@ public:
         nVersion = 0;
     }
 
-    // empty constructor
+    //! empty constructor
     CCoins() : fCoinBase(false), vout(0), nHeight(0), nVersion(0) { }
 
-    // remove spent outputs at the end of vout
+    //!remove spent outputs at the end of vout
     void Cleanup() {
         while (vout.size() > 0 && vout.back().IsNull())
             vout.pop_back();
@@ -130,7 +131,7 @@ public:
         std::swap(to.nVersion, nVersion);
     }
 
-    // equality test
+    //! equality test
     friend bool operator==(const CCoins &a, const CCoins &b) {
          // Empty CCoins objects are always equal.
          if (a.IsPruned() && b.IsPruned())
@@ -236,19 +237,19 @@ public:
         Cleanup();
     }
 
-    // mark an outpoint spent, and construct undo information
+    //! mark an outpoint spent, and construct undo information
     bool Spend(const COutPoint &out, CTxInUndo &undo);
 
-    // mark a vout spent
+    //! mark a vout spent
     bool Spend(int nPos);
 
-    // check whether a particular output is still available
+    //! check whether a particular output is still available
     bool IsAvailable(unsigned int nPos) const {
         return (nPos < vout.size() && !vout[nPos].IsNull());
     }
 
-    // check whether the entire CCoins is spent
-    // note that only !IsPruned() CCoins can be serialized
+    //! check whether the entire CCoins is spent
+    //! note that only !IsPruned() CCoins can be serialized
     bool IsPruned() const {
         BOOST_FOREACH(const CTxOut &out, vout)
             if (!out.IsNull())
@@ -264,9 +265,12 @@ private:
 
 public:
     CCoinsKeyHasher();
-    // This *must* return size_t. With Boost 1.46 on 32-bit systems the
-    // unordered_map will behave unpredictably if the custom hasher returns a
-    // uint64_t, resulting in failures when syncing the chain (#4634).
+
+    /**
+     * This *must* return size_t. With Boost 1.46 on 32-bit systems the
+     * unordered_map will behave unpredictably if the custom hasher returns a
+     * uint64_t, resulting in failures when syncing the chain (#4634).
+     */
     size_t operator()(const uint256& key) const {
         return key.GetHash(salt);
     }
@@ -305,24 +309,24 @@ struct CCoinsStats
 class CCoinsView
 {
 public:
-    // Retrieve the CCoins (unspent transaction outputs) for a given txid
+    //! Retrieve the CCoins (unspent transaction outputs) for a given txid
     virtual bool GetCoins(const uint256 &txid, CCoins &coins) const;
 
-    // Just check whether we have data for a given txid.
-    // This may (but cannot always) return true for fully spent transactions
+    //! Just check whether we have data for a given txid.
+    //! This may (but cannot always) return true for fully spent transactions
     virtual bool HaveCoins(const uint256 &txid) const;
 
-    // Retrieve the block hash whose state this CCoinsView currently represents
+    //! Retrieve the block hash whose state this CCoinsView currently represents
     virtual uint256 GetBestBlock() const;
 
-    // Do a bulk modification (multiple CCoins changes + BestBlock change).
-    // The passed mapCoins can be modified.
+    //! Do a bulk modification (multiple CCoins changes + BestBlock change).
+    //! The passed mapCoins can be modified.
     virtual bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
 
-    // Calculate statistics about the unspent transaction output set
+    //! Calculate statistics about the unspent transaction output set
     virtual bool GetStats(CCoinsStats &stats) const;
 
-    // As we use CCoinsViews polymorphically, have a virtual destructor
+    //! As we use CCoinsViews polymorphically, have a virtual destructor
     virtual ~CCoinsView() {}
 };
 
@@ -346,9 +350,11 @@ public:
 
 class CCoinsViewCache;
 
-/** A reference to a mutable cache entry. Encapsulating it allows us to run
+/** 
+ * A reference to a mutable cache entry. Encapsulating it allows us to run
  *  cleanup code after the modification is finished, and keeping track of
- *  concurrent modifications. */
+ *  concurrent modifications. 
+ */
 class CCoinsModifier
 {
 private:
@@ -370,8 +376,10 @@ protected:
     /* Whether this cache has an active modifier. */
     bool hasModifier;
 
-    /* Make mutable so that we can "fill the cache" even from Get-methods
-       declared as "const".  */
+    /**
+     * Make mutable so that we can "fill the cache" even from Get-methods
+     * declared as "const".  
+     */
     mutable uint256 hashBlock;
     mutable CCoinsMap cacheCoins;
 
@@ -386,37 +394,44 @@ public:
     void SetBestBlock(const uint256 &hashBlock);
     bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
 
-    // Return a pointer to CCoins in the cache, or NULL if not found. This is
-    // more efficient than GetCoins. Modifications to other cache entries are
-    // allowed while accessing the returned pointer.
+    /**
+     * Return a pointer to CCoins in the cache, or NULL if not found. This is
+     * more efficient than GetCoins. Modifications to other cache entries are
+     * allowed while accessing the returned pointer.
+     */
     const CCoins* AccessCoins(const uint256 &txid) const;
 
-    // Return a modifiable reference to a CCoins. If no entry with the given
-    // txid exists, a new one is created. Simultaneous modifications are not
-    // allowed.
+    /**
+     * Return a modifiable reference to a CCoins. If no entry with the given
+     * txid exists, a new one is created. Simultaneous modifications are not
+     * allowed.
+     */
     CCoinsModifier ModifyCoins(const uint256 &txid);
 
-    // Push the modifications applied to this cache to its base.
-    // Failure to call this method before destruction will cause the changes to be forgotten.
-    // If false is returned, the state of this cache (and its backing view) will be undefined.
+    /**
+     * Push the modifications applied to this cache to its base.
+     * Failure to call this method before destruction will cause the changes to be forgotten.
+     * If false is returned, the state of this cache (and its backing view) will be undefined.
+     */
     bool Flush();
 
-    // Calculate the size of the cache (in number of transactions)
+    //! Calculate the size of the cache (in number of transactions)
     unsigned int GetCacheSize() const;
 
-    /** Amount of bitcoins coming in to a transaction
-        Note that lightweight clients may not know anything besides the hash of previous transactions,
-        so may not be able to calculate this.
-
-        @param[in] tx	transaction for which we are checking input total
-        @return	Sum of value of all inputs (scriptSigs)
+    /** 
+     * Amount of bitcoins coming in to a transaction
+     * Note that lightweight clients may not know anything besides the hash of previous transactions,
+     * so may not be able to calculate this.
+     *
+     * @param[in] tx	transaction for which we are checking input total
+     * @return	Sum of value of all inputs (scriptSigs)
      */
     CAmount GetValueIn(const CTransaction& tx) const;
 
-    // Check whether all prevouts of the transaction are present in the UTXO set represented by this view
+    //! Check whether all prevouts of the transaction are present in the UTXO set represented by this view
     bool HaveInputs(const CTransaction& tx) const;
 
-    // Return priority of tx at height nHeight
+    //! Return priority of tx at height nHeight
     double GetPriority(const CTransaction &tx, int nHeight) const;
 
     const CTxOut &GetOutputFor(const CTxIn& input) const;
diff --git a/src/compressor.h b/src/compressor.h
index 226be620e8..d9cde5de7a 100644
--- a/src/compressor.h
+++ b/src/compressor.h
@@ -28,19 +28,23 @@ class CScriptID;
 class CScriptCompressor
 {
 private:
-    // make this static for now (there are only 6 special scripts defined)
-    // this can potentially be extended together with a new nVersion for
-    // transactions, in which case this value becomes dependent on nVersion
-    // and nHeight of the enclosing transaction.
+    /**
+     * make this static for now (there are only 6 special scripts defined)
+     * this can potentially be extended together with a new nVersion for
+     * transactions, in which case this value becomes dependent on nVersion
+     * and nHeight of the enclosing transaction.
+     */
     static const unsigned int nSpecialScripts = 6;
 
     CScript &script;
 protected:
-    // These check for scripts for which a special case with a shorter encoding is defined.
-    // They are implemented separately from the CScript test, as these test for exact byte
-    // sequence correspondences, and are more strict. For example, IsToPubKey also verifies
-    // whether the public key is valid (as invalid ones cannot be represented in compressed
-    // form).
+    /**
+     * These check for scripts for which a special case with a shorter encoding is defined.
+     * They are implemented separately from the CScript test, as these test for exact byte
+     * sequence correspondences, and are more strict. For example, IsToPubKey also verifies
+     * whether the public key is valid (as invalid ones cannot be represented in compressed
+     * form).
+     */
     bool IsToKeyID(CKeyID &hash) const;
     bool IsToScriptID(CScriptID &hash) const;
     bool IsToPubKey(CPubKey &pubkey) const;
diff --git a/src/crypter.h b/src/crypter.h
index b589987c4f..f7018cfdbe 100644
--- a/src/crypter.h
+++ b/src/crypter.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009-2013 The Bitcoin developers
+// Copyright (c) 2009-2014 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -14,20 +14,20 @@ class uint256;
 const unsigned int WALLET_CRYPTO_KEY_SIZE = 32;
 const unsigned int WALLET_CRYPTO_SALT_SIZE = 8;
 
-/*
-Private key encryption is done based on a CMasterKey,
-which holds a salt and random encryption key.
-
-CMasterKeys are encrypted using AES-256-CBC using a key
-derived using derivation method nDerivationMethod
-(0 == EVP_sha512()) and derivation iterations nDeriveIterations.
-vchOtherDerivationParameters is provided for alternative algorithms
-which may require more parameters (such as scrypt).
-
-Wallet Private Keys are then encrypted using AES-256-CBC
-with the double-sha256 of the public key as the IV, and the
-master key's key as the encryption key (see keystore.[ch]).
-*/
+/**
+ * Private key encryption is done based on a CMasterKey,
+ * which holds a salt and random encryption key.
+ * 
+ * CMasterKeys are encrypted using AES-256-CBC using a key
+ * derived using derivation method nDerivationMethod
+ * (0 == EVP_sha512()) and derivation iterations nDeriveIterations.
+ * vchOtherDerivationParameters is provided for alternative algorithms
+ * which may require more parameters (such as scrypt).
+ * 
+ * Wallet Private Keys are then encrypted using AES-256-CBC
+ * with the double-sha256 of the public key as the IV, and the
+ * master key's key as the encryption key (see keystore.[ch]).
+ */
 
 /** Master key for wallet encryption */
 class CMasterKey
@@ -35,12 +35,12 @@ class CMasterKey
 public:
     std::vector<unsigned char> vchCryptedKey;
     std::vector<unsigned char> vchSalt;
-    // 0 = EVP_sha512()
-    // 1 = scrypt()
+    //! 0 = EVP_sha512()
+    //! 1 = scrypt()
     unsigned int nDerivationMethod;
     unsigned int nDeriveIterations;
-    // Use this for more parameters to key derivation,
-    // such as the various parameters to scrypt
+    //! Use this for more parameters to key derivation,
+    //! such as the various parameters to scrypt
     std::vector<unsigned char> vchOtherDerivationParameters;
 
     ADD_SERIALIZE_METHODS;
@@ -120,17 +120,17 @@ private:
 
     CKeyingMaterial vMasterKey;
 
-    // if fUseCrypto is true, mapKeys must be empty
-    // if fUseCrypto is false, vMasterKey must be empty
+    //! if fUseCrypto is true, mapKeys must be empty
+    //! if fUseCrypto is false, vMasterKey must be empty
     bool fUseCrypto;
 
-    // keeps track of whether Unlock has run a thourough check before
+    //! keeps track of whether Unlock has run a thorough check before
     bool fDecryptionThoroughlyChecked;
 
 protected:
     bool SetCrypted();
 
-    // will encrypt previously unencrypted keys
+    //! will encrypt previously unencrypted keys
     bool EncryptKeys(CKeyingMaterial& vMasterKeyIn);
 
     bool Unlock(const CKeyingMaterial& vMasterKeyIn);
@@ -189,7 +189,8 @@ public:
         }
     }
 
-    /* Wallet status (encrypted, locked) changed.
+    /**
+     * Wallet status (encrypted, locked) changed.
      * Note: Called without locks held.
      */
     boost::signals2::signal<void (CCryptoKeyStore* wallet)> NotifyStatusChanged;
diff --git a/src/db.h b/src/db.h
index 85ffbae1cb..1c572d8970 100644
--- a/src/db.h
+++ b/src/db.h
@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_DB_H
@@ -50,7 +50,7 @@ public:
     void MakeMock();
     bool IsMock() { return fMockDb; }
 
-    /*
+    /**
      * Verify that database file strFile is OK. If it is not,
      * call the callback to try to recover.
      * This must be called BEFORE strFile is opened.
@@ -60,7 +60,7 @@ public:
                         RECOVER_OK,
                         RECOVER_FAIL };
     VerifyResult Verify(std::string strFile, bool (*recoverFunc)(CDBEnv& dbenv, std::string strFile));
-    /*
+    /**
      * Salvage data from a file that Verify says is bad.
      * fAggressive sets the DB_AGGRESSIVE flag (see berkeley DB->verify() method documentation).
      * Appends binary key/value pairs to vResult, returns true if successful.
diff --git a/src/ecwrapper.cpp b/src/ecwrapper.cpp
index 68cdbf2eda..5ce7e61294 100644
--- a/src/ecwrapper.cpp
+++ b/src/ecwrapper.cpp
@@ -13,9 +13,11 @@
 
 namespace {
 
-// Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
-// recid selects which key is recovered
-// if check is non-zero, additional checks are performed
+/**
+ * Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
+ * recid selects which key is recovered
+ * if check is non-zero, additional checks are performed
+ */
 int ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
 {
     if (!eckey) return 0;
diff --git a/src/ecwrapper.h b/src/ecwrapper.h
index 30c3db7931..4efde51650 100644
--- a/src/ecwrapper.h
+++ b/src/ecwrapper.h
@@ -12,7 +12,7 @@
 
 class uint256;
 
-// RAII Wrapper around OpenSSL's EC_KEY
+/** RAII Wrapper around OpenSSL's EC_KEY */
 class CECKey {
 private:
     EC_KEY *pkey;
@@ -25,10 +25,12 @@ public:
     bool SetPubKey(const unsigned char* pubkey, size_t size);
     bool Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig);
 
-    // reconstruct public key from a compact signature
-    // This is only slightly more CPU intensive than just verifying it.
-    // If this function succeeds, the recovered public key is guaranteed to be valid
-    // (the signature is a valid signature of the given data for that key)
+    /**
+     * reconstruct public key from a compact signature
+     * This is only slightly more CPU intensive than just verifying it.
+     * If this function succeeds, the recovered public key is guaranteed to be valid
+     * (the signature is a valid signature of the given data for that key)
+     */
     bool Recover(const uint256 &hash, const unsigned char *p64, int rec);
 
     bool TweakPublic(const unsigned char vchTweak[32]);
diff --git a/src/leveldbwrapper.h b/src/leveldbwrapper.h
index 10b7a2427c..42479206c8 100644
--- a/src/leveldbwrapper.h
+++ b/src/leveldbwrapper.h
@@ -1,5 +1,5 @@
-// Copyright (c) 2012-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2012-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_LEVELDBWRAPPER_H
@@ -24,7 +24,7 @@ public:
 
 void HandleError(const leveldb::Status& status) throw(leveldb_error);
 
-// Batch of changes queued to be written to a CLevelDBWrapper
+/** Batch of changes queued to be written to a CLevelDBWrapper */
 class CLevelDBBatch
 {
     friend class CLevelDBWrapper;
@@ -64,25 +64,25 @@ public:
 class CLevelDBWrapper
 {
 private:
-    // custom environment this database is using (may be NULL in case of default environment)
+    //! custom environment this database is using (may be NULL in case of default environment)
     leveldb::Env* penv;
 
-    // database options used
+    //! database options used
     leveldb::Options options;
 
-    // options used when reading from the database
+    //! options used when reading from the database
     leveldb::ReadOptions readoptions;
 
-    // options used when iterating over values of the database
+    //! options used when iterating over values of the database
     leveldb::ReadOptions iteroptions;
 
-    // options used when writing to the database
+    //! options used when writing to the database
     leveldb::WriteOptions writeoptions;
 
-    // options used when sync writing to the database
+    //! options used when sync writing to the database
     leveldb::WriteOptions syncoptions;
 
-    // the database itself
+    //! the database itself
     leveldb::DB* pdb;
 
 public:
diff --git a/src/timedata.cpp b/src/timedata.cpp
index 40cdb33f7a..59f7778db1 100644
--- a/src/timedata.cpp
+++ b/src/timedata.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "timedata.h"
@@ -17,14 +17,13 @@ using namespace std;
 static CCriticalSection cs_nTimeOffset;
 static int64_t nTimeOffset = 0;
 
-//
-// "Never go to sea with two chronometers; take one or three."
-// Our three time sources are:
-//  - System clock
-//  - Median of other nodes clocks
-//  - The user (asking the user to fix the system clock if the first two disagree)
-//
-//
+/**
+ * "Never go to sea with two chronometers; take one or three."
+ * Our three time sources are:
+ *  - System clock
+ *  - Median of other nodes clocks
+ *  - The user (asking the user to fix the system clock if the first two disagree)
+ */
 int64_t GetTimeOffset()
 {
     LOCK(cs_nTimeOffset);
diff --git a/src/timedata.h b/src/timedata.h
index 2c20f4efd5..64595ffc37 100644
--- a/src/timedata.h
+++ b/src/timedata.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_TIMEDATA_H
@@ -12,7 +12,8 @@
 
 class CNetAddr;
 
-/** Median filter over a stream of values.
+/** 
+ * Median filter over a stream of values.
  * Returns the median of the last N numbers
  */
 template <typename T>
@@ -67,7 +68,7 @@ public:
     }
 };
 
-/* Functions to keep track of adjusted P2P time */
+/** Functions to keep track of adjusted P2P time */
 int64_t GetTimeOffset();
 int64_t GetAdjustedTime();
 void AddTimeData(const CNetAddr& ip, int64_t nTime);
diff --git a/src/txdb.h b/src/txdb.h
index 147c186990..9a98fcc41b 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_TXDB_H
@@ -17,11 +17,11 @@
 class CCoins;
 class uint256;
 
-// -dbcache default (MiB)
+//! -dbcache default (MiB)
 static const int64_t nDefaultDbCache = 100;
-// max. -dbcache in (MiB)
+//! max. -dbcache in (MiB)
 static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 4096 : 1024;
-// min. -dbcache in (MiB)
+//! min. -dbcache in (MiB)
 static const int64_t nMinDbCache = 4;
 
 /** CCoinsView backed by the LevelDB coin database (chainstate/) */
diff --git a/src/uint256.h b/src/uint256.h
index 28de540226..56f7f44a16 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_UINT256_H
@@ -255,8 +255,10 @@ public:
         return sizeof(pn);
     }
 
-    // Returns the position of the highest bit set plus one, or zero if the
-    // value is zero.
+    /**
+     * Returns the position of the highest bit set plus one, or zero if the
+     * value is zero.
+     */
     unsigned int bits() const;
 
     uint64_t GetLow64() const
@@ -301,26 +303,27 @@ public:
     uint256(uint64_t b) : base_uint<256>(b) {}
     explicit uint256(const std::string& str) : base_uint<256>(str) {}
     explicit uint256(const std::vector<unsigned char>& vch) : base_uint<256>(vch) {}
-
-    // The "compact" format is a representation of a whole
-    // number N using an unsigned 32bit number similar to a
-    // floating point format.
-    // The most significant 8 bits are the unsigned exponent of base 256.
-    // This exponent can be thought of as "number of bytes of N".
-    // The lower 23 bits are the mantissa.
-    // Bit number 24 (0x800000) represents the sign of N.
-    // N = (-1^sign) * mantissa * 256^(exponent-3)
-    //
-    // Satoshi's original implementation used BN_bn2mpi() and BN_mpi2bn().
-    // MPI uses the most significant bit of the first byte as sign.
-    // Thus 0x1234560000 is compact (0x05123456)
-    // and  0xc0de000000 is compact (0x0600c0de)
-    // (0x05c0de00) would be -0x40de000000
-    //
-    // Bitcoin only uses this "compact" format for encoding difficulty
-    // targets, which are unsigned 256bit quantities.  Thus, all the
-    // complexities of the sign bit and using base 256 are probably an
-    // implementation accident.
+    
+    /**
+     * The "compact" format is a representation of a whole
+     * number N using an unsigned 32bit number similar to a
+     * floating point format.
+     * The most significant 8 bits are the unsigned exponent of base 256.
+     * This exponent can be thought of as "number of bytes of N".
+     * The lower 23 bits are the mantissa.
+     * Bit number 24 (0x800000) represents the sign of N.
+     * N = (-1^sign) * mantissa * 256^(exponent-3)
+     * 
+     * Satoshi's original implementation used BN_bn2mpi() and BN_mpi2bn().
+     * MPI uses the most significant bit of the first byte as sign.
+     * Thus 0x1234560000 is compact (0x05123456)
+     * and  0xc0de000000 is compact (0x0600c0de)
+     * 
+     * Bitcoin only uses this "compact" format for encoding difficulty
+     * targets, which are unsigned 256bit quantities.  Thus, all the
+     * complexities of the sign bit and using base 256 are probably an
+     * implementation accident.
+     */
     uint256& SetCompact(uint32_t nCompact, bool *pfNegative = NULL, bool *pfOverflow = NULL);
     uint32_t GetCompact(bool fNegative = false) const;