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269 lines
8.7 KiB
Markdown
269 lines
8.7 KiB
Markdown
# Onion Monero Blockchain Explorer
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Curently available Monero blockchain explorer websites have several limitations which are of special importance to privacy-oriented users:
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- they use JavaScript,
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- have images which might be used for [cookieless tracking](http://lucb1e.com/rp/cookielesscookies/),
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- track users activates through google analytics,
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- are closed sourced,
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- are not available as hidden services,
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- provide only basic search capabilities,
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- can't identify users outputs based on provided Monero address and viewkey.
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In this example, these limitations are addressed by development of
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an Onion Monero Blockchain Explorer. The example not only shows how to use Monero C++ libraries, but also demonstrates how to use:
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- [crow](https://github.com/ipkn/crow) - C++ micro web framework
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- [lmdb++](https://github.com/bendiken/lmdbxx) - C++ wrapper for the LMDB
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- [mstch](https://github.com/no1msd/mstch) - C++ {{mustache}} templates
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- [rapidjson](https://github.com/miloyip/rapidjson) - C++ JSON parser/generator
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## Address
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Tor users:
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- [http://xmrblocksvckbwvx.onion](http://xmrblocksvckbwvx.onion)
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Non tor users, can use its clearnet version (thanks to [Gingeropolous](https://github.com/Gingeropolous)):
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- [http://explore.MoneroWorld.com](http://explore.moneroworld.com)
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## Onion Monero Blockchain Explorer features
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The key features of the Onion Monero Blockchain Explorer are
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- available as a hidden service,
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- no javascript, no cookies, no web analytics trackers, no images,
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- open sourced,
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- made fully in C++,
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- the only explorer showing encrypted payments ID,
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- the only explorer with the ability to search by encrypted payments ID, tx public
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keys, stealth addresses, input key images,
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output amount index and its amount,
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- the only explorer showing ring signatures,
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- the only explorer showing transaction extra field,
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- the only explorer showing public components of Monero addresses,
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- the only explorer that can show which outputs belong to the given Monero address and viewkey,
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- the only explorer that can be used to prove that you send Monero to someone,
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- the only explorer showing detailed information about mixins, such as, mixins'
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age, timescale, mixin of mixins,
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- the only explorer showing number of amount output indices.
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## Prerequisite
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Everything here was done and tested using Monero 0.9.4 on Ubuntu 16.04 x86_64.
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Instruction for Monero 0.9 compilation and Monero headers and libraries setup are
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as shown here:
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- [Compile Monero 0.9 on Ubuntu 16.04 x64](https://github.com/moneroexamples/compile-monero-09-on-ubuntu-16-04)
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- [lmdbcpp-monero](https://github.com/moneroexamples/lmdbcpp-monero.git)
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## C++ code
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```c++
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int main(int ac, const char* av[]) {
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// get command line options
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xmreg::CmdLineOptions opts {ac, av};
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auto help_opt = opts.get_option<bool>("help");
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// if help was chosen, display help text and finish
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if (*help_opt)
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{
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return EXIT_SUCCESS;
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}
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auto port_opt = opts.get_option<string>("port");
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auto bc_path_opt = opts.get_option<string>("bc-path");
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auto custom_db_path_opt = opts.get_option<string>("custom-db-path");
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auto deamon_url_opt = opts.get_option<string>("deamon-url");
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//cast port number in string to uint16
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uint16_t app_port = boost::lexical_cast<uint16_t>(*port_opt);
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// get blockchain path
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path blockchain_path;
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if (!xmreg::get_blockchain_path(bc_path_opt, blockchain_path))
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{
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cerr << "Error getting blockchain path." << endl;
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return EXIT_FAILURE;
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}
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// enable basic monero log output
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xmreg::enable_monero_log();
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// create instance of our MicroCore
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// and make pointer to the Blockchain
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xmreg::MicroCore mcore;
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cryptonote::Blockchain* core_storage;
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// initialize mcore and core_storage
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if (!xmreg::init_blockchain(blockchain_path.string(),
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mcore, core_storage))
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{
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cerr << "Error accessing blockchain." << endl;
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return EXIT_FAILURE;
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}
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// create instance of page class which
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// contains logic for the website
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xmreg::page xmrblocks(&mcore, core_storage, *deamon_url_opt);
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// crow instance
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crow::SimpleApp app;
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CROW_ROUTE(app, "/")
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([&]() {
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return xmrblocks.index2();
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});
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CROW_ROUTE(app, "/page/<uint>")
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([&](size_t page_no) {
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return xmrblocks.index2(page_no);
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});
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CROW_ROUTE(app, "/block/<uint>")
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([&](size_t block_height) {
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return xmrblocks.show_block(block_height);
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});
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CROW_ROUTE(app, "/block/<string>")
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([&](string block_hash) {
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return xmrblocks.show_block(block_hash);
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});
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CROW_ROUTE(app, "/tx/<string>")
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([&](string tx_hash) {
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return xmrblocks.show_tx(tx_hash);
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});
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CROW_ROUTE(app, "/tx/<string>/<uint>")
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([&](string tx_hash, uint with_ring_signatures) {
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return xmrblocks.show_tx(tx_hash, with_ring_signatures);
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});
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CROW_ROUTE(app, "/myoutputs").methods("GET"_method)
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([&](const crow::request& req) {
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string tx_hash = string(req.url_params.get("tx_hash"));
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string xmr_address = string(req.url_params.get("xmr_address"));
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string viewkey = string(req.url_params.get("viewkey"));
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return xmrblocks.show_my_outputs(tx_hash, xmr_address, viewkey);
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});
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CROW_ROUTE(app, "/search").methods("GET"_method)
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([&](const crow::request& req) {
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return xmrblocks.search(string(req.url_params.get("value")));
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});
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CROW_ROUTE(app, "/autorefresh")
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([&]() {
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uint64_t page_no {0};
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bool refresh_page {true};
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return xmrblocks.index2(page_no, refresh_page);
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});
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// run the crow http server
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app.port(app_port).multithreaded().run();
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return EXIT_SUCCESS;
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}
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```
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## Example screenshot
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## Compile and run the explorer
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##### Monero headers and libraries setup
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The Onion Explorer uses Monero C++ libraries and headers. Also some functionality
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in the Explorer for mempool is achieved through [patching](https://github.com/moneroexamples/compile-monero-09-on-ubuntu-16-04/blob/master/res/tx_blob_to_tx_info.patch)
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the Monero deamon.
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Instructions how to download Monero source files, apply a patch, compile Monero,
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setup header and library files are presented here:
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- https://github.com/moneroexamples/compile-monero-09-on-ubuntu-16-04 (Ubuntu 16.04)
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- https://github.com/moneroexamples/compile-monero-09-on-arch-linux (Arch Linux)
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##### Custom lmdb database (optional)
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Most unique search abilities of the Onion Explorer are achieved through using
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a [custom lmdb database](https://github.com/moneroexamples/lmdbcpp-monero.git) constructed based on the Monero blockchain.
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The reason for the custom database is that Monero's own lmdb database has limited
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search abilities. For example, its not possible to search for a tx having a
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given key image, except by performing an exhaustive search on the blockchain which is very time consuming.
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Instruction how to compile the `lmdbcpp-monero` are provided here:
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- https://github.com/moneroexamples/lmdbcpp-monero.git
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The custom database is rather big, 12GB now, and it must be running alongside Monero deamon
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so that it keeps updating itself with new information from new blocks as they are added
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to the blockchain.
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For these reasons, its use is optional. However, without it, some searches wont be possible,
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e.g., searching for key images, output and tx public keys, encrypted payments id.
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##### Compile and run the explorer
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Once the Monero is compiled and setup, the explorer can be downloaded and compiled
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as follows:
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```bash
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# download the source code
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git clone https://github.com/moneroexamples/onion-monero-blockchain-explorer.git
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# enter the downloaded sourced code folder
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cd onion-monero-blockchain-explorer
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# create the makefile
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cmake .
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# compile
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make
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```
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When compilation finishes executable `xmrblocks` should be created.
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To run it:
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```
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./xmrblocks
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```
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Example output:
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```bash
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[mwo@arch onion-monero-blockchain-explorer]$ ./xmrblocks
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2016-May-28 10:04:49.160280 Blockchain initialized. last block: 1056761, d0.h0.m12.s47 time ago, current difficulty: 1517857750
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(2016-05-28 02:04:49) [INFO ] Crow/0.1 server is running, local port 8081
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```
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Go to your browser: http://127.0.0.1:8081
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## Other examples
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Other examples can be found on [github](https://github.com/moneroexamples?tab=repositories).
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Please know that some of the examples/repositories are not
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finished and may not work as intended.
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## How can you help?
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Constructive criticism, code and website edits are always good. They can be made through github.
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Some Monero are also welcome:
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```
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48daf1rG3hE1Txapcsxh6WXNe9MLNKtu7W7tKTivtSoVLHErYzvdcpea2nSTgGkz66RFP4GKVAsTV14v6G3oddBTHfxP6tU
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```
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