fix docs (#1404)

- fix info about files
- add info about InstantSend

Author: UdjinM6

doc/files.md

@@ -1,15 +1,20 @@
 
 * banlist.dat: stores the IPs/Subnets of banned nodes
-* bitcoin.conf: contains configuration settings for bitcoind or bitcoin-qt
-* bitcoind.pid: stores the process id of bitcoind while running
+* dash.conf: contains configuration settings for dashd or dash-qt
+* dashd.pid: stores the process id of dashd while running
 * blocks/blk000??.dat: block data (custom, 128 MiB per file); since 0.8.0
 * blocks/rev000??.dat; block undo data (custom); since 0.8.0 (format changed since pre-0.8)
 * blocks/index/*; block index (LevelDB); since 0.8.0
 * chainstate/*; block chain state database (LevelDB); since 0.8.0
 * database/*: BDB database environment; only used for wallet since 0.8.0
 * db.log: wallet database log file
-* debug.log: contains debug information and general logging generated by bitcoind or bitcoin-qt
+* debug.log: contains debug information and general logging generated by dashd or dash-qt
 * fee_estimates.dat: stores statistics used to estimate minimum transaction fees and priorities required for confirmation; since 0.10.0
+* governance.dat: stores data for governance obgects
+* masternode.conf: contains configuration settings for remote masternodes
+* mncache.dat: stores data for masternode list
+* mnpayments.dat: stores data for masternode payments
+* netfulfilled.dat: stores data about recently made network requests
 * peers.dat: peer IP address database (custom format); since 0.7.0
 * wallet.dat: personal wallet (BDB) with keys and transactions
 * .cookie: session RPC authentication cookie (written at start when cookie authentication is used, deleted on shutdown): since 0.12.0

doc/instantsend.md

@@ -0,0 +1,58 @@
+##InstantSend Technical Information
+
+InstantSend has been integrated into the Core Daemon in two ways:
+* "push" notifications (ZMQ and `-instantsendnotify` cmd-line/config option);
+* RPC commands.
+
+####ZMQ
+
+When a "Transaction Lock" occurs the hash of the related transaction is broadcasted through ZMQ using both the `zmqpubrawtxlock` and `zmqpubhashtxlock` channels.
+
+* `zmqpubrawtxlock`: publishes the raw transaction when locked via InstantSend
+* `zmqpubhashtxlock`: publishes the transaction hash when locked via InstantSend
+
+This mechanism has been integrated into Bitcore-Node-Dash which allows for notification to be broadcast through Insight API in one of two ways:
+* WebSocket: [https://github.com/dashpay/insight-api-dash#web-socket-api](https://github.com/dashpay/insight-api-dash#web-socket-api) 
+* API: [https://github.com/dashpay/insight-api-dash#instantsend-transactions](https://github.com/dashpay/insight-api-dash#instantsend-transactions) 
+
+####Command line option
+
+When a wallet InstantSend transaction is successfully locked a shell command provided in this option is executed (`%s` in `<cmd>` is replaced by TxID):
+
+```
+-instantsendnotify=<cmd>
+```
+
+####RPC
+
+Details pertaining to an observed "Transaction Lock" can also be retrieved through RPC, it’s important however to understand the underlying mechanism.
+
+By default, the Dash Core daemon will launch using the following constant:
+
+```
+static const int DEFAULT_INSTANTSEND_DEPTH = 5;
+```
+
+This value can be overridden by passing the following argument to the Dash Core daemon:
+
+```
+-instantsenddepth=<n>
+```
+
+The key thing to understand is that this value indicates the number of "confirmations" a successful Transaction Lock represents. When Wallet RPC commands are performed (such as `listsinceblock`) this attribute is taken into account when returning information about the transaction. The value in `confirmations` field you see through RPC is showing the number of `"Blockchain Confirmations" + "InstantSend Depth"` (assuming the funds were sent via InstantSend).
+
+There is also a field named `bcconfirmations`. The value in this field represents the total number of `"Blockchain Confirmations"` for a given transaction without taking into account whether it was InstantSend or not.
+
+**Examples**
+* InstantSend transaction just occurred:
+    * confirmations: 5
+    * bcconfirmations: 0
+* InstantSend transaction received one confirmation from blockchain:
+    * confirmations: 6
+    * bcconfirmations: 1
+* non-InstantSend transaction just occurred:
+    * confirmations: 0
+    * bcconfirmations: 0
+* non-InstantSend transaction received one confirmation from blockchain:
+    * confirmations: 1
+    * bcconfirmations: 1