improve reproducible docs

docs/reproducible.md

@@ -1,4 +1,4 @@
-## Reproducible builds
+# Reproducible builds
 
 Reproducibility is a goal of the Sparrow Wallet project.
 As of v1.5.0 and later, it is possible to recreate the exact binaries in the Github releases (specifically, the contents of the `.tar.gz` and `.zip` files).
@@ -7,12 +7,15 @@ Due to minor variances, it is not yet possible to reproduce the installer packag
 In addition, the OSX binary is code signed and thus can't be directly reproduced yet.
 Work on resolving both of these issues is ongoing.
 
-### Reproducing a release
+## Reproducing a release
 
-#### Install Java
+### Install Java
 
 Because Sparrow bundles a Java runtime in the release binaries, it is essential to have the same version of Java installed when creating the release.
 For v1.6.6 and later, this is Eclipse Temurin 18.0.1+10.
+
+#### Java from Adoptium github repo
+
 It is available for all supported platforms from [Eclipse Temurin 18.0.1+10](https://github.com/adoptium/temurin18-binaries/releases/tag/jdk-18.0.1%2B10).
 
 For reference, the downloads are as follows:
@@ -21,16 +24,45 @@ For reference, the downloads are as follows:
 - [MacOS aarch64](https://github.com/adoptium/temurin18-binaries/releases/download/jdk-18.0.1%2B10/OpenJDK18U-jdk_aarch64_mac_hotspot_18.0.1_10.tar.gz)
 - [Windows x64](https://github.com/adoptium/temurin18-binaries/releases/download/jdk-18.0.1%2B10/OpenJDK18U-jdk_x64_windows_hotspot_18.0.1_10.zip)
 
+#### Java from Adoptium deb repo
+
 It is also possible to install via a package manager on *nix systems. For example, on Debian/Ubuntu systems:
-```shell
-sudo apt-get install -y wget apt-transport-https gnupg
-wget -O - https://packages.adoptium.net/artifactory/api/gpg/key/public | sudo apt-key add -
-echo "deb https://packages.adoptium.net/artifactory/deb $(awk -F= '/^VERSION_CODENAME/{print$2}' /etc/os-release) main" | sudo tee /etc/apt/sources.list.d/adoptium.list
+
+- Install dependencies:
+```sh
+sudo apt-get install -y wget curl apt-transport-https gnupg
+```
+
+Download Adoptium public PGP key:
+```sh
+curl --tlsv1.2 --proto =https --location -o adoptium.asc https://packages.adoptium.net/artifactory/api/gpg/key/public
+```
+
+Check if key fingerprint matches: `3B04D753C9050D9A5D343F39843C48A565F8F04B`:
+```
+gpg --import --import-options show-only adoptium.asc
+```
+If key doesn't match, do not procede.
+
+Add Adoptium PGP key to a the keyring shared folder:
+```sh
+sudo cp adoptium.asc /usr/share/keyrings/
+```
+
+Add Adoptium debian repository:
+```sh
+echo "deb [signed-by=/usr/share/keyrings/adoptium.asc] https://packages.adoptium.net/artifactory/deb $(awk -F= '/^VERSION_CODENAME/{print$2}' /etc/os-release) main" | sudo tee /etc/apt/sources.list.d/adoptium.list
+```
+
+Update cache, install the desired temurin version and configure java to be linked to this same version:
+```
 sudo apt update -y
 sudo apt-get install -y temurin-18-jdk=18.0.1+10
 sudo update-alternatives --config java
 ```
 
+#### Java from SDK
+
 A alternative option for all platforms is to use the [sdkman.io](https://sdkman.io/) package manager ([Git Bash for Windows](https://git-scm.com/download/win) is a good choice on that platform).
 See the installation [instructions here](https://sdkman.io/install).
 Once installed, run
@@ -38,19 +70,19 @@ Once installed, run
 sdk install java 18.0.1-tem
 ```
 
-#### Other requirements
+### Other requirements
 
 Other packages may also be necessary to build depending on the platform. On Debian/Ubuntu systems:
 ```shell
 sudo apt install -y rpm fakeroot binutils
 ```
 
-#### Building the binaries
+### Building the binaries
 
 The project can cloned for a specific release tag as follows:
 ```shell
 GIT_TAG="1.6.6"
-git clone --recursive --branch "${GIT_TAG}" git@github.com:sparrowwallet/sparrow.git
+git clone --recursive --branch "${GIT_TAG}" https://github.com/sparrowwallet/sparrow.git
 ```
 
 Thereafter, building should be straightforward:
@@ -62,7 +94,9 @@ cd sparrow
 
 The binaries (and installers) will be placed in the `build/jpackage` folder.
 
-#### Verifying the binaries are identical
+### Verifying the binaries are identical
+
+Verify the built binaries against the released binaries on https://github.com/sparrowwallet/sparrow/releases.
 
 Note that you will be verifying the files in the `build/jpackage/Sparrow` folder against either the `.tar.gz` or `.zip` releases.
 Download either of these depending on your platform and extract the contents to a folder (in the following example, `/tmp`).
@@ -74,3 +108,4 @@ diff -r build/jpackage/Sparrow /tmp/Sparrow
 
 This command should have no output indicating that the two folders (and all their contents) are identical.
 
+If there is output, please open an issue with detailed instructions to reproduce, including build system platform.