Replace `hidden service` with `onion service`

For a couple of years, Tor documentation has made
the term hidden service obsolete, in favor of onion
service.

This PR updates all the references in the code base.

7 files changed, 18 insertions, 18 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 11a0f4bac7..2e11474382 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -158,7 +158,7 @@ the pull request affects. Valid areas as:
 Examples:
 
     consensus: Add new opcode for BIP-XXXX OP_CHECKAWESOMESIG
-    net: Automatically create hidden service, listen on Tor
+    net: Automatically create onion service, listen on Tor
     qt: Add feed bump button
     log: Fix typo in log message
 
diff --git a/doc/JSON-RPC-interface.md b/doc/JSON-RPC-interface.md
index a0cfe84a3e..40d8e330e2 100644
--- a/doc/JSON-RPC-interface.md
+++ b/doc/JSON-RPC-interface.md
@@ -60,7 +60,7 @@ RPC interface will be abused.
   are sent as clear text that can be read by anyone on your network
   path.  Additionally, the RPC interface has not been hardened to
   withstand arbitrary Internet traffic, so changing the above settings
-  to expose it to the Internet (even using something like a Tor hidden
+  to expose it to the Internet (even using something like a Tor onion
   service) could expose you to unconsidered vulnerabilities.  See
   `bitcoind -help` for more information about these settings and other
   settings described in this document.
diff --git a/doc/files.md b/doc/files.md
index 5475826329..52e094a60b 100644
--- a/doc/files.md
+++ b/doc/files.md
@@ -56,7 +56,7 @@ Subdirectory       | File(s)               | Description
 `./`               | `fee_estimates.dat`   | Stores statistics used to estimate minimum transaction fees and priorities required for confirmation
 `./`               | `guisettings.ini.bak` | Backup of former [GUI settings](#gui-settings) after `-resetguisettings` option is used
 `./`               | `mempool.dat`         | Dump of the mempool's transactions
-`./`               | `onion_private_key`   | Cached Tor hidden service private key for `-listenonion` option
+`./`               | `onion_private_key`   | Cached Tor onion service private key for `-listenonion` option
 `./`               | `peers.dat`           | Peer IP address database (custom format)
 `./`               | `settings.json`       | Read-write settings set through GUI or RPC interfaces, augmenting manual settings from [bitcoin.conf](bitcoin-conf.md). File is created automatically if read-write settings storage is not disabled with `-nosettings` option. Path can be specified with `-settings` option
 `./`               | `.cookie`             | Session RPC authentication cookie; if used, created at start and deleted on shutdown; can be specified by `-rpccookiefile` option
diff --git a/doc/tor.md b/doc/tor.md
index 2c54e32f84..17807856e5 100644
--- a/doc/tor.md
+++ b/doc/tor.md
@@ -1,6 +1,6 @@
 # TOR SUPPORT IN BITCOIN
 
-It is possible to run Bitcoin Core as a Tor hidden service, and connect to such services.
+It is possible to run Bitcoin Core as a Tor onion service, and connect to such services.
 
 The following directions assume you have a Tor proxy running on port 9050. Many distributions default to having a SOCKS proxy listening on port 9050, but others may not. In particular, the Tor Browser Bundle defaults to listening on port 9150. See [Tor Project FAQ:TBBSocksPort](https://www.torproject.org/docs/faq.html.en#TBBSocksPort) for how to properly
 configure Tor.
@@ -14,12 +14,12 @@ outgoing connections, but more is possible.
 	-proxy=ip:port  Set the proxy server. If SOCKS5 is selected (default), this proxy
 	                server will be used to try to reach .onion addresses as well.
 
-	-onion=ip:port  Set the proxy server to use for Tor hidden services. You do not
+	-onion=ip:port  Set the proxy server to use for Tor onion services. You do not
 	                need to set this if it's the same as -proxy. You can use -noonion
-	                to explicitly disable access to hidden services.
+	                to explicitly disable access to onion services.
 
 	-listen         When using -proxy, listening is disabled by default. If you want
-	                to run a hidden service (see next section), you'll need to enable
+	                to run an onion service (see next section), you'll need to enable
 	                it explicitly.
 
 	-connect=X      When behind a Tor proxy, you can specify .onion addresses instead
@@ -94,11 +94,11 @@ for normal IPv4/IPv6 communication, use:
 ## 3. Automatically listen on Tor
 
 Starting with Tor version 0.2.7.1 it is possible, through Tor's control socket
-API, to create and destroy 'ephemeral' hidden services programmatically.
+API, to create and destroy 'ephemeral' onion services programmatically.
 Bitcoin Core has been updated to make use of this.
 
 This means that if Tor is running (and proper authentication has been configured),
-Bitcoin Core automatically creates a hidden service to listen on. This will positively
+Bitcoin Core automatically creates an onion service to listen on. This will positively
 affect the number of available .onion nodes.
 
 This new feature is enabled by default if Bitcoin Core is listening (`-listen`), and
@@ -110,7 +110,7 @@ Connecting to Tor's control socket API requires one of two authentication method
 configured. It also requires the control socket to be enabled, e.g. put `ControlPort 9051`
 in `torrc` config file. For cookie authentication the user running bitcoind must have read
 access to the `CookieAuthFile` specified in Tor configuration. In some cases this is
-preconfigured and the creation of a hidden service is automatic. If permission problems
+preconfigured and the creation of an onion service is automatic. If permission problems
 are seen with `-debug=tor` they can be resolved by adding both the user running Tor and
 the user running bitcoind to the same group and setting permissions appropriately. On
 Debian-based systems the user running bitcoind can be added to the debian-tor group,
@@ -127,8 +127,8 @@ in the tor configuration file. The hashed password can be obtained with the comm
 
 ## 4. Privacy recommendations
 
-- Do not add anything but Bitcoin Core ports to the hidden service created in section 2.
-  If you run a web service too, create a new hidden service for that.
+- Do not add anything but Bitcoin Core ports to the onion service created in section 2.
+  If you run a web service too, create a new onion service for that.
   Otherwise it is trivial to link them, which may reduce privacy. Hidden
   services created automatically (as in section 3) always have only one port
   open.
diff --git a/src/init.cpp b/src/init.cpp
index 6cca21f375..08944b79a5 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -442,13 +442,13 @@ void SetupServerArgs(NodeContext& node)
     argsman.AddArg("-externalip=<ip>", "Specify your own public address", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-forcednsseed", strprintf("Always query for peer addresses via DNS lookup (default: %u)", DEFAULT_FORCEDNSSEED), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-listen", "Accept connections from outside (default: 1 if no -proxy or -connect)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
-    argsman.AddArg("-listenonion", strprintf("Automatically create Tor hidden service (default: %d)", DEFAULT_LISTEN_ONION), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
+    argsman.AddArg("-listenonion", strprintf("Automatically create Tor onion service (default: %d)", DEFAULT_LISTEN_ONION), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-maxconnections=<n>", strprintf("Maintain at most <n> connections to peers (default: %u)", DEFAULT_MAX_PEER_CONNECTIONS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-maxreceivebuffer=<n>", strprintf("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)", DEFAULT_MAXRECEIVEBUFFER), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-maxsendbuffer=<n>", strprintf("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)", DEFAULT_MAXSENDBUFFER), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-maxtimeadjustment", strprintf("Maximum allowed median peer time offset adjustment. Local perspective of time may be influenced by peers forward or backward by this amount. (default: %u seconds)", DEFAULT_MAX_TIME_ADJUSTMENT), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-maxuploadtarget=<n>", strprintf("Tries to keep outbound traffic under the given target (in MiB per 24h). Limit does not apply to peers with 'download' permission. 0 = no limit (default: %d)", DEFAULT_MAX_UPLOAD_TARGET), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
-    argsman.AddArg("-onion=<ip:port>", "Use separate SOCKS5 proxy to reach peers via Tor hidden services, set -noonion to disable (default: -proxy)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
+    argsman.AddArg("-onion=<ip:port>", "Use separate SOCKS5 proxy to reach peers via Tor onion services, set -noonion to disable (default: -proxy)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-onlynet=<net>", "Make outgoing connections only through network <net> (ipv4, ipv6 or onion). Incoming connections are not affected by this option. This option can be specified multiple times to allow multiple networks.", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peerbloomfilters", strprintf("Support filtering of blocks and transaction with bloom filters (default: %u)", DEFAULT_PEERBLOOMFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peerblockfilters", strprintf("Serve compact block filters to peers per BIP 157 (default: %u)", DEFAULT_PEERBLOCKFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
diff --git a/src/qt/forms/optionsdialog.ui b/src/qt/forms/optionsdialog.ui
index fea759dee0..0016fb9739 100644
--- a/src/qt/forms/optionsdialog.ui
+++ b/src/qt/forms/optionsdialog.ui
@@ -459,10 +459,10 @@
        <item>
         <widget class="QCheckBox" name="connectSocksTor">
          <property name="toolTip">
-          <string>Connect to the Bitcoin network through a separate SOCKS5 proxy for Tor hidden services.</string>
+          <string>Connect to the Bitcoin network through a separate SOCKS5 proxy for Tor onion services.</string>
          </property>
          <property name="text">
-          <string>Use separate SOCKS&amp;5 proxy to reach peers via Tor hidden services:</string>
+          <string>Use separate SOCKS&amp;5 proxy to reach peers via Tor onion services:</string>
          </property>
         </widget>
        </item>
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index 84118b36ef..5d56d1ff89 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -405,7 +405,7 @@ static bool WriteBinaryFile(const fs::path &filename, const std::string &data)
 /****** Bitcoin specific TorController implementation ********/
 
 /** Controller that connects to Tor control socket, authenticate, then create
- * and maintain an ephemeral hidden service.
+ * and maintain an ephemeral onion service.
  */
 class TorController
 {
@@ -534,7 +534,7 @@ void TorController::auth_cb(TorControlConnection& _conn, const TorControlReply&
         // Finally - now create the service
         if (private_key.empty()) // No private key, generate one
             private_key = "NEW:RSA1024"; // Explicitly request RSA1024 - see issue #9214
-        // Request hidden service, redirect port.
+        // Request onion service, redirect port.
         // Note that the 'virtual' port is always the default port to avoid decloaking nodes using other ports.
         _conn.Command(strprintf("ADD_ONION %s Port=%i,127.0.0.1:%i", private_key, Params().GetDefaultPort(), GetListenPort()),
             std::bind(&TorController::add_onion_cb, this, std::placeholders::_1, std::placeholders::_2));