An EOS.IO Developer's Notes - How To Publish A Contract to the EOS Public Testnet

3년 전

An EOS.IO Developer's Notes - How To Publish A Contract to the Public Testnet

Written by: Gunnar Pope on 2/21/2017

Hey Steemians and EOS developers!

Here are the notes I recorded when learning how to publish the EOS.IO currency contract to the Public Testnet. I'm posting this in response to @jjcali question on how to run the eos node and to help grow the @eos community. I learned how to do all of this from reading the EOS github Tutorials here:

Some of these commands may be outdated with the new migrations to the Dawn 3.0 code, but I hope it helps someone out there (just one person would make me happy!) learn how to use the terminal and run the EOS blockchain.

If you enjoy, please support me as a developer! I'm a biomedical engineering student and have about 3 blockchain dapps I would like to (rapidly) develop but I can only get to write code in my free time at night. For EOS to really rocket to the moon and realize its full potential, we need need every developer we can find, from experienced developers to newbies, to start applying EOS dapps across a range of real-world applications. Then the world will finally understand what our excitement is all about.



Please upvote @powderskier on Steemit to support!

Or Donate!

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Ok, let's start the wallet

$ cd /eos/build/programs/eos-walletd && ./eos-walletd

1453521ms            wallet_plugin.cpp:34          plugin_initialize    ] initializing wallet plugin
1453521ms            http_plugin.cpp:138           plugin_initialize    ] host: port: 8888
1453522ms            http_plugin.cpp:141           plugin_initialize    ] configured http to listen on
1453522ms            http_plugin.cpp:153           plugin_startup       ] start processing http thread
1453522ms            http_plugin.cpp:210           plugin_startup       ] start listening for http requests
1453522ms            http_plugin.cpp:215           plugin_startup       ] http io service exit
1453522ms            wallet_api_plugin.cpp:69      plugin_startup       ] starting wallet_api_plugin
1453522ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/create
1453522ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/get_public_keys
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/import_key
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/list_keys
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/list_wallets
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/lock
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/lock_all
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/open
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/set_timeout
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/sign_transaction
1453523ms            http_plugin.cpp:239           add_handler          ] add api url: /v1/wallet/unlock

Open a new terminal and move into eosc folder to use .eosc

$ cd eos/build/programs/eosc/

Open a wallet named gptestnet

eosc:$ ./eosc wallet open -n gptestnet
Opened: gptestnet
eosc$ ./eosc wallet list

Unlock the wallet

eosc$ eosc wallet unlock -n gptestnet
password: Unlocked: gptestnet
eosc$ eosc wallet list
  "gptestnet *"

Learn how to get an account as an developer here:

My account is called powderskier.

Connect eosc to the testnet

$ eosc$ ./eosc -H -p 80 get account powderskier
  "account_name": "powderskier",
  "eos_balance": "100.0000 EOS",
  "staked_balance": "0.0001 EOS",
  "unstaking_balance": "0.0000 EOS",
  "last_unstaking_time": "1969-12-31T23:59:59",
  "permissions": [{
      "perm_name": "active",
      "parent": "owner",
      "required_auth": {
        "threshold": 1,
        "keys": [{
            "key": "EOS7gUMtWH1TEW31v8rXCe6zYajqUo46qH22CQN6PX4nzMzJZkUhS",
            "weight": 1
        "accounts": []
      "perm_name": "owner",
      "parent": "",
      "required_auth": {
        "threshold": 1,
        "keys": [{
            "key": "EOS7gUMtWH1TEW31v8rXCe6zYajqUo46qH22CQN6PX4nzMzJZkUhS",
            "weight": 1
        "accounts": []

Add an alias for the eosc settings to allow you to type $ eosc get code powderskier instead of eosc -H -p 80 get code powderskier

echo "alias eosc='eosc -H -p 80'" >> ~/.bash_aliases

$ source ~/.bash_aliases

Before uploading a contract, verify that there is no current contract:

eosc$ eosc get code powderskier
code hash: 0000000000000000000000000000000000000000000000000000000000000000

Complete the build process by running build install. This will create all the binaries needed to run eosc, eoscpp, eosd, etc...

$ cd ~/eos/build && make install

Add the executables to my path

$ cd eos/build/install/bin
bin $ ls
abi_gen     codegen     embed_genesis   eos-walletd eosc        eoscpp      eosd        launcher

add the path to the eos binaries to your $PATH variable. (This step is no longer necessary after running the new eos build script, but I'll leave it here for reference purposes.)

bin$ echo "export PATH=$PATH:eos/build/install/bin" >> ~/.bash_profile
bin $ source ~/.bash_profile

Ok, I've had trouble compiling the .wast file and cant find a way to fix the include path of the compiler. Use this directory to adjust the compile path

bin $ pwd
bin $ ls
abi_gen     applesedemo codegen     embed_genesis   eos-walletd eosc        eoscpp      eosd        eosio-walletd   eosioc      eosiod      launcher

Looks like the new wallets are stored here:

$ cd eos/data-dir
data-dir $ ls
config.ini      gptestnet2.wallet

This location is subject to change so you may want to use$ sudo find / -name data-dir to find this folders location.

Open and unlock the gptestnet walletd

eosc$ ./eosc wallet unlock -n gptestnet --password XXXXXXXXXXXXXXXXXXXXXXXXXXXX
Unlocked: gptestnet
eosc$ ./eosc wallet list
  "gptestnet *",
  "gptestnet2 *"

Now, connect to the testnet and upload the currency contract

$ ./eosc -H -p 80 get account powderskier

or use the alias we created earlier to execute the same command:

$ eosc get account powderskier

Yes! I was able to publish the exchange.wast contract!

eosc$ ./eosc -H -p 80 set contract powderskier ../../contracts/exchange/exchange.wast
Reading WAST...
Assembling WASM...
Publishing contract...
  "transaction_id": "626d913dab6c1379d6126d362f5b6e78f9109d9b4b62b1bc6d79c68138077540",
  "processed": {
    "ref_block_num": 63806,
    "ref_block_prefix": 1190020872,
    "expiration": "2018-01-29T03:51:50",
    "scope": [
    "signatures": [
    "messages": [{
        "code": "eos",
        "type": "setcode",
        "authorization": [{
            "account": "powderskier",
            "permission": "active"
        "data": {
          "account": "powderskier",
          "vm_type": 0,
          "vm_version": 0,
          "code": "0061736d01000000015b0f60057e7e7e7f7f017f60027f7f0060017f0060037e7e7f017f60047e7e7f7f017f60017e006000017f60027f7f017f60037f7f7f017

Good luck with your own developments and send me a comment or share your EOS developer experiences. I'd love to hear about your experiences. I'm hear to help launch the distributed computing movement to improve trust, privacy, security, and relationships in the digital world and please let me know how I can help.


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Thank you so much for putting this together. I'm now following you. Looking forward to more great content.


Excellent @jjcali! I'll try to put together another tutorial this week.

Stupid newbie questions, are you running this on a local machine that you have or a cloud server? If it is a local machine what is your configuration? Is there a minimum connection speed required? I have a plain DSL account that currently is currently not so great on the upload side. Will that be a problem just getting something started and allow my continued learning?
Thanks for the help.

but I hope it helps someone out there (just one person would make me happy!)

I'm one so you can be HAPPY!



Thanks for the support, SDG! It feels amazing to lend a hand to this community.

Here's my feedback:

  • "Are you running this on a local machine that you have or a cloud server?"
    • I'm writing code locally (like building the currency.cpp application) and then using the ./eosc function to interact with the EOS.IO blockchain which is running on a set of remote servers (I believe).

In order to interact with the public testnet, you need to start running a local node using the ./eosd (or ./eosiod) command. I think about this like opening a communication portal between you and the blockchain. Once ./eosd is running, you can start sending actions to the eosio blockchain using the ./eosc (or ./eosioc) command which allows you to publish contracts, execute a contract, etc.

  • "If it is a local machine what is your configuration?"
    • I'm using a 2014 macbook pro with download speed of about 50Mbps and an upload of 10Mbps, which isn't too fast and pretty available to most people.

Try getting just the .eosd and .eosc working and see if you can connect ( or 'ping') the testnet blockchain using the following command:

$ ./eosc -H -p 80 get account powderskier

Once you can do that simple test case, you just confirmed that you can send commands and retrieve data from the eosio blockchain (and you know that your connection speed can handle the basic use case of running a node.) From there, try to publish a simple example dapp and grow your application from there.

Great tutorial :)

Also you can check that the contract is there using the EOS tracker => . :)


Nice app @kesarito! That's the first time I've been there and was amazed at how quickly you can see the total transaction history of the account. That's the beauty of blockchain tech I suppose. Keep it up, @kesarito.

This is fantastic, great work.

Here's a couple of notes to help you along :)

./bashrc has some logic for a separate aliases include which used to need to be manually uncommented but is defaulted to enabled now so you could change that line to
echo "alias eosc='eosc -H -p 80'" >> ~/.bash_aliasesso that it doesn't pollute a potentially existing ./bash_profile.

Notice i've also removed the ./ since after you run cd /eos/build && sudo make install the eosc binary is put into the PATH. ( "add the path to the eos binaries to your $PATH variable" also shouldn't be necessary anymore )

The data-dir is subject to change based on whether you're running a local node or not. Your best bet would be to do sudo find / -name data-dir and grab the location from there, for instance mine is at:


Thank you for your advice, @nsjames! I've edited the post to include your suggestions and thank for your feedback.

Thanks for sharing these notes. Keep doing it as it can help someone.


This feedback really helps me craft my next batch of content to publish on @steemit and @eos development and I appreciate it.

Did you compare the ease of development with neo / iota / ethereum?


I actually started with ethereum and tried that for a month and came to the realization that their platform has some serious development pitfalls. Mainly:

  • All app developers have to learn Solidity and there is very little documentation even learn that language. I program in C, python, and matlab and could learn Solitity, but the lack of documentation slows development.
  • The ethereum platform seemed to be 'under designed' to me and, at the time, seemed like it could only handle the processing of simple, smart contracts. That means that their model will have scalability problems when industry tries to push more and more complex computing through the platform. The launching of CryptoKitties proved this observation true.

At this point, I started looking at around for companies that could address the scalability problem as well as be developer friendly. I settled on becoming an EOS developer because I believe in their vision, team, their C++ based dev language choice, and their working track record with Bitshares and Steemit. I'm all in on these guys and can't wait to see what grows out of the EOS platform.


Resteemed as well


Awesome @lior-h. Thank you for the support.