Incubed Client in C

The Incubed client is a

• Crypto-Economic
• Non-syncronizing and stateless, but fully verifying
• Minimal resource consuming

blockchain client (Crypto-Economic Client, Minimal Verification Client, Ultra Light Client). This version is written in C.

Most blockchains, such as Ethereum, require a client to connect to their blockchain network. Often, these clientsrequire a lot of storage, a very high bandwidth or constant computation. While this is possible to perform on laptops or desktop systems,mobile devices, mobile app, and even web applications struggle to meet these requirements. Currently the solution of choice is to use alight client or remote client on mobile devices. While this may work for mobile phones, most IoT devices are unable to run light clients.Connecting an IoT device to a remote node enables even low-performance IoT devices to be connected to blockchain. However, by using distinctremote nodes, the advantages of a decentralized network are undermined introducing a single point of failure. Also, it is unsecure becausethe client is not able to verify the results by itself. The same applies for mobile apps or web pages.The Trustless Incentivized Remote Node Network, in short Incubed, makes it possible to establish adecentralized and secure network of remote nodes and clients which are able to verify and validate the results, enabling trustworthy andfast access to blockchain for a large number of low-performance IoT, mobile devices, and web applications.

A more detailed explanation of in3 can be found here.

For information on the in3-node, please go here.

For information on the in3 typescript client, please go here.

Installation and Usage

Example

Please have a look at the examples folder in the repo for more detailed examples.

CLI

in3 can be used on the command line in this manner:

in3 [options] method [arguments]

For example,

To get block number, run:

> in3 eth_blockNumber
8610795

A more detailed list with information on arguments can be found here.

C Code

Example C code can be found here

#include <in3/client.h>    // the core client
#include <in3/eth_basic.h> // use the basic module
#include <in3/in3_curl.h>  // transport implementation
#include <inttypes.h>
#include <stdio.h>

int main(int argc, char* argv[]) {
 // register a chain-verifier for basic Ethereum-Support, which is enough to verify blocks
 in3_register_eth_basic();

 in3_register_curl(); // use curl as the default for sending out requests

 in3_t* in3 = in3_for_chain(CHAIN_ID_MAINNET); // create new incubed client

 char *result, *error;  // prepare 2 pointers for the result.

 in3_ret_t res = in3_client_rpc(   // send raw rpc-request, which is then verified
     in3,                    //  the configured client
     "eth_getBlockByNumber", // the rpc-method you want to call.
     "[\"latest\",true]",    // the arguments as json-string
     &result,                // the reference to a pointer whill hold the result
     &error);                // the pointer which may hold a error message

 if (res == IN3_OK) {
   printf("Latest block : \n%s\n", result);
   free(result);
 } else {
   printf("Error verifing the Latest block : \n%s\n", error);
   free(error);
 }
 in3_free(in3);   // cleanup client after usage

}

A more detailed example with information on how to call functions can be found here.

Features

Resources

• C API reference
• C examples
• in3-node
• in3 typescript client
• Website
• ReadTheDocs
• Blog
• Incubed concept video by Christoph Jentzsch
• Ethereum verification explained by Simon Jentzsch

Contributors welcome!

We at Blockchains believe in the power of the open source community. Feel free to open any issues you may come across, forkthe repository and integrate in your own projects. You can reach us on various social media platforms for any questionsand suggestions.

Got any questions?

Contact us on orsend us an email at team-in3@slock.it

LICENSE

COMMERCIAL LICENSE

Licensees holding a valid commercial license may use this software in accordancewith the commercial license agreement provided with the Software or, alternatively,in accordance with the terms contained in a written agreement between you andslock.it GmbH/Blockchains LLC. For licensing terms and conditions or furtherinformation please contact slock.it at in3@slock.it.Alternatively, this software may be used under the AGPL license as follows:

AGPL LICENSE

This program is free software: you can redistribute it and/or modify it under theterms of the GNU Affero General Public License as published by the Free SoftwareFoundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANYWARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR APARTICULAR PURPOSE. See the GNU Affero General Public License for more details.[Permissions of this strong copyleft license are conditioned on making availablecomplete source code of licensed works and modifications, which include largerworks using a licensed work, under the same license. Copyright and license noticesmust be preserved. Contributors provide an express grant of patent rights.]You should have received a copy of the GNU Affero General Public License alongwith this program. If not, see https://www.gnu.org/licenses/.