Onion Monero Prover

Currently, to prove to someone that you send them some monero, you can use this: checktx. Altought its useful, it is limited in that it:

• uses JavaScript and
• not available as hidden services.

In this example, these limitations are addressed by development of an Onion Monero Prover. The example not only shows how to use Monero C++ libraries, but also demonstrates how to use:

• crow - C++ micro web framework
• lmdb++ - C++ wrapper for the LMDB
• mstch - C++ {{mustache}} templates
• rapidjson - C++ JSON parser/generator

Address

Tor users:

• ggggg

Non tor users, can use its clearnet version (thanks to Gingeropolous):

• http://explore.MoneroWorld.com

Prerequisite

Everything here was done and tested using Monero 0.9.4 on Ubuntu 16.04 x86_64.

Instruction for Monero 0.9 compilation and Monero headers and libraries setup are as shown here:

• Compile Monero 0.9 on Ubuntu 16.04 x64
• lmdbcpp-monero

C++ code

Example screenshot

Compile and run the explorer

Monero headers and libraries setup

The Onion Explorer uses Monero C++ libraries and headers. Also some functionality in the Explorer for mempool is achieved through patching the Monero deamon. Instructions how to download Monero source files, apply a patch, compile Monero, setup header and library files are presented here:

• https://github.com/moneroexamples/compile-monero-09-on-ubuntu-16-04 (Ubuntu 16.04)
• https://github.com/moneroexamples/compile-monero-09-on-arch-linux (Arch Linux)

Custom lmdb database (optional)

Most unique search abilities of the Onion Explorer are achieved through using a custom lmdb database constructed based on the Monero blockchain. The reason for the custom database is that Monero's own lmdb database has limited search abilities. For example, its not possible to search for a tx having a given key image, except by performing an exhaustive search on the blockchain which is very time consuming.

Instruction how to compile the lmdbcpp-monero are provided here:

• https://github.com/moneroexamples/lmdbcpp-monero.git

The custom database is rather big, 12GB now, and it must be running alongside Monero deamon so that it keeps updating itself with new information from new blocks as they are added to the blockchain.

For these reasons, its use is optional. However, without it, some searches wont be possible, e.g., searching for key images, output and tx public keys, encrypted payments id.

Compile and run the explorer

Once the Monero is compiled and setup, the explorer can be downloaded and compiled as follows:

# download the source code
git clone https://github.com/moneroexamples/onion-monero-blockchain-explorer.git

# enter the downloaded sourced code folder
cd onion-monero-blockchain-explorer

# create the makefile
cmake .

# compile
make

When compilation finishes executable xmrblocks should be created.

To run it:

./xmrblocks

Example output:

[mwo@arch onion-monero-blockchain-explorer]$ ./xmrblocks
2016-May-28 10:04:49.160280 Blockchain initialized. last block: 1056761, d0.h0.m12.s47 time ago, current difficulty: 1517857750
(2016-05-28 02:04:49) [INFO    ] Crow/0.1 server is running, local port 8081

Go to your browser: http://127.0.0.1:8081

Other examples

Other examples can be found on github. Please know that some of the examples/repositories are not finished and may not work as intended.

How can you help?

Constructive criticism, code and website edits are always good. They can be made through github.

Some Monero are also welcome:

48daf1rG3hE1Txapcsxh6WXNe9MLNKtu7W7tKTivtSoVLHErYzvdcpea2nSTgGkz66RFP4GKVAsTV14v6G3oddBTHfxP6tU