12 files changed, 47 insertions, 37 deletions
diff --git a/doc/README.md b/doc/README.md
index d3017de2ab..46b311b251 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -84,5 +84,3 @@ The Bitcoin repo's [root README](/README.md) contains relevant information on th
 License
 ---------------------
 Distributed under the [MIT software license](/COPYING).
-This product includes software developed by the OpenSSL Project for use in the [OpenSSL Toolkit](https://www.openssl.org/). This product includes
-cryptographic software written by Eric Young ([eay@cryptsoft.com](mailto:eay@cryptsoft.com)), and UPnP software written by Thomas Bernard.
diff --git a/doc/build-freebsd.md b/doc/build-freebsd.md
index d22b6e8383..4831623504 100644
--- a/doc/build-freebsd.md
+++ b/doc/build-freebsd.md
@@ -11,7 +11,7 @@ This guide does not contain instructions for building the GUI.
 You will need the following dependencies, which can be installed as root via pkg:
 
 ```shell
-pkg install autoconf automake boost-libs git gmake libevent libtool openssl pkgconf
+pkg install autoconf automake boost-libs git gmake libevent libtool pkgconf
 
 git clone https://github.com/bitcoin/bitcoin.git
 ```
diff --git a/doc/build-osx.md b/doc/build-osx.md
index 9942449bf6..bf655538c7 100644
--- a/doc/build-osx.md
+++ b/doc/build-osx.md
@@ -19,7 +19,7 @@ Then install [Homebrew](https://brew.sh).
 
 ## Dependencies
 ```shell
-brew install automake berkeley-db4 libtool boost miniupnpc openssl pkg-config python qt libevent qrencode
+brew install automake berkeley-db4 libtool boost miniupnpc pkg-config python qt libevent qrencode
 ```
 
 See [dependencies.md](dependencies.md) for a complete overview.
@@ -110,7 +110,7 @@ tail -f $HOME/Library/Application\ Support/Bitcoin/debug.log
 ```
 
 ## Notes
-* Tested on OS X 10.10 Yosemite through macOS 10.14 Mojave on 64-bit Intel
+* Tested on OS X 10.12 Sierra through macOS 10.15 Catalina on 64-bit Intel
 processors only.
 * Building with downloaded Qt binaries is not officially supported. See the notes in [#7714](https://github.com/bitcoin/bitcoin/issues/7714).
 
diff --git a/doc/build-unix.md b/doc/build-unix.md
index d048bdeff5..e799e709fa 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -33,7 +33,6 @@ These dependencies are required:
 
  Library     | Purpose          | Description
  ------------|------------------|----------------------
- libssl      | Crypto           | Random Number Generation, Elliptic Curve Cryptography
  libboost    | Utility          | Library for threading, data structures, etc
  libevent    | Networking       | OS independent asynchronous networking
 
@@ -81,7 +80,7 @@ Build requirements:
 
 Now, you can either build from self-compiled [depends](/depends/README.md) or install the required dependencies:
 
-    sudo apt-get install libssl-dev libevent-dev libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev
+    sudo apt-get install libevent-dev libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev
 
 BerkeleyDB is required for the wallet.
 
@@ -127,7 +126,7 @@ built by default.
 
 Build requirements:
 
-    sudo dnf install gcc-c++ libtool make autoconf automake openssl-devel libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3
+    sudo dnf install gcc-c++ libtool make autoconf automake libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3
 
 Optional (see `--with-miniupnpc` and `--enable-upnp-default`):
 
diff --git a/doc/dependencies.md b/doc/dependencies.md
index dc88626761..4b57ef2e91 100644
--- a/doc/dependencies.md
+++ b/doc/dependencies.md
@@ -13,11 +13,10 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | FreeType | [2.7.1](https://download.savannah.gnu.org/releases/freetype) |  | No |  |  |
 | GCC |  | [4.8+](https://gcc.gnu.org/) (C++11 support) |  |  |  |
 | HarfBuzz-NG |  |  |  |  |  |
-| libevent | [2.1.8-stable](https://github.com/libevent/libevent/releases) | 2.0.22 | No |  |  |
+| libevent | [2.1.11-stable](https://github.com/libevent/libevent/releases) | 2.0.22 | No |  |  |
 | libpng |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
 | librsvg | |  |  |  |  |
 | MiniUPnPc | [2.0.20180203](http://miniupnp.free.fr/files) |  | No |  |  |
-| OpenSSL | [1.0.1k](https://www.openssl.org/source) |  | Yes |  |  |
 | PCRE |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
 | Python (tests) |  | [3.5](https://www.python.org/downloads) |  |  |  |
 | qrencode | [3.4.4](https://fukuchi.org/works/qrencode) |  | No |  |  |
diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index 60eb542b53..49f60c54ec 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -36,6 +36,7 @@ Developer Notes
     - [GUI](#gui)
     - [Subtrees](#subtrees)
     - [Scripted diffs](#scripted-diffs)
+        - [Suggestions and examples](#suggestions-and-examples)
     - [Release notes](#release-notes)
     - [RPC interface guidelines](#rpc-interface-guidelines)
 
@@ -881,7 +882,7 @@ Scripted diffs
 For reformatting and refactoring commits where the changes can be easily automated using a bash script, we use
 scripted-diff commits. The bash script is included in the commit message and our Travis CI job checks that
 the result of the script is identical to the commit. This aids reviewers since they can verify that the script
-does exactly what it's supposed to do. It is also helpful for rebasing (since the same script can just be re-run
+does exactly what it is supposed to do. It is also helpful for rebasing (since the same script can just be re-run
 on the new master commit).
 
 To create a scripted-diff:
@@ -902,7 +903,35 @@ For development, it might be more convenient to verify all scripted-diffs in a r
 test/lint/commit-script-check.sh origin/master..HEAD
 ```
 
-Commit [`bb81e173`](https://github.com/bitcoin/bitcoin/commit/bb81e173) is an example of a scripted-diff.
+### Suggestions and examples
+
+If you need to replace in multiple files, prefer `git ls-files` to `find` or globbing, and `git grep` to `grep`, to
+avoid changing files that are not under version control.
+
+For efficient replacement scripts, reduce the selection to the files that potentially need to be modified, so for
+example, instead of a blanket `git ls-files src | xargs sed -i s/apple/orange/`, use
+`git grep -l apple src | xargs sed -i s/apple/orange/`.
+
+Also, it is good to keep the selection of files as specific as possible — for example, replace only in directories where
+you expect replacements — because it reduces the risk that a rebase of your commit by re-running the script will
+introduce accidental changes.
+
+Some good examples of scripted-diff:
+
+- [scripted-diff: Rename InitInterfaces to NodeContext](https://github.com/bitcoin/bitcoin/commit/301bd41a2e6765b185bd55f4c541f9e27aeea29d)
+uses an elegant script to replace occurences of multiple terms in all source files.
+
+- [scripted-diff: Remove g_connman, g_banman globals](https://github.com/bitcoin/bitcoin/commit/301bd41a2e6765b185bd55f4c541f9e27aeea29d)
+replaces specific terms in a list of specific source files.
+
+- [scripted-diff: Replace fprintf with tfm::format](https://github.com/bitcoin/bitcoin/commit/fac03ec43a15ad547161e37e53ea82482cc508f9)
+does a global replacement but excludes certain directories.
+
+To find all previous uses of scripted diffs in the repository, do:
+
+```
+git log --grep="-BEGIN VERIFY SCRIPT-"
+```
 
 Release notes
 -------------
diff --git a/doc/man/bitcoin-cli.1 b/doc/man/bitcoin-cli.1
index 95c1d24dff..129651d8e9 100644
--- a/doc/man/bitcoin-cli.1
+++ b/doc/man/bitcoin-cli.1
@@ -113,7 +113,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoin-qt.1 b/doc/man/bitcoin-qt.1
index 1957fb736e..f68be21e8d 100644
--- a/doc/man/bitcoin-qt.1
+++ b/doc/man/bitcoin-qt.1
@@ -608,7 +608,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoin-tx.1 b/doc/man/bitcoin-tx.1
index 6b6071d9b7..b4c7698896 100644
--- a/doc/man/bitcoin-tx.1
+++ b/doc/man/bitcoin-tx.1
@@ -114,7 +114,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoin-wallet.1 b/doc/man/bitcoin-wallet.1
index 1cb8cdebcd..aadea09a2b 100644
--- a/doc/man/bitcoin-wallet.1
+++ b/doc/man/bitcoin-wallet.1
@@ -61,7 +61,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoind.1 b/doc/man/bitcoind.1
index b0aff99ca2..211ba10285 100644
--- a/doc/man/bitcoind.1
+++ b/doc/man/bitcoind.1
@@ -581,7 +581,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/release-notes.md b/doc/release-notes.md
index a47c8802b0..88740ea1da 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -46,16 +46,15 @@ Compatibility
 ==============
 
 Bitcoin Core is supported and extensively tested on operating systems using
-the Linux kernel, macOS 10.10+, and Windows 7 and newer. It is not recommended
+the Linux kernel, macOS 10.12+, and Windows 7 and newer. It is not recommended
 to use Bitcoin Core on unsupported systems.
 
 Bitcoin Core should also work on most other Unix-like systems but is not
 as frequently tested on them.
 
-From Bitcoin Core 0.17.0 onwards, macOS versions earlier than 10.10 are no
-longer supported, as Bitcoin Core is now built using Qt 5.9.x which requires
-macOS 10.10+. Additionally, Bitcoin Core does not yet change appearance when
-macOS "dark mode" is activated.
+From Bitcoin Core 0.20.0 onwards, macOS versions earlier than 10.12 are no
+longer supported. Additionally, Bitcoin Core does not yet change appearance
+when macOS "dark mode" is activated.
 
 In addition to previously supported CPU platforms, this release's pre-compiled
 distribution provides binaries for the RISC-V platform.
@@ -63,6 +62,12 @@ distribution provides binaries for the RISC-V platform.
 Notable changes
 ===============
 
+Build System
+------------
+
+- OpenSSL is no longer used by Bitcoin Core. The last usage of the library
+was removed in #17265.
+
 New RPCs
 --------