Okay, so we've seen Golem requestors hand out tasks to providers and saw them pay those providers for the successfully executed tasks. We've also seen how we could utilize layer 2 (zkSync) to speed up those payments and significantly cut the transactions fees.

Still, in the context of running Golem on the Ethereum mainnet, a few important questions remain largely unanswered:

• how do you get funds to your requestor so you can use them to pay for the tasks?

• how do you get funds out of a Golem node if you don't need them there anymore?

• how to secure access to the funds in your Golem wallet if things go haywire?

ERC-20 vs Layer2

The most important distinction in basically every piece of payment-related activity, both when you consider transactions between the network's nodes but also when talking about getting funds in and out of Golem is whether you're using the regular ERC-20 token directly on the Ethereum blockchain or whether you're using zkSync.

While direct, on-chain transactions using ERC-20-based tokens have long become the daily bread for the Ethereum mainnet and constitute a significant part of more than a million transactions passing through the chain each day, the recent spike in both the ETH's price and the average gas prices makes it almost completely useless as a means of exchange in Golem where the value paid will usually be orders of magnitude smaller than the fee for the payment itself.

Of course, if you're willing to accept that disproportion, you may continue to use our ERC-20 payment driver but for the majority of Golem node users, zkSync will be the main platform both when paying for tasks and receiving payments for their execution.

Your Golem wallet

Golem's wallet is automatically initialized for you the first time you start your yagna daemon and thus, an address associated with it is also generated automatically.

Obviously, to have any kind of funds transferred to your Golem's wallet, you'll need its address. You may obtain it using the id command:

yagna id show

The value described as nodeId in the output is the Ethereum address of your Golem node and it's also the address of its wallet. Note it down so you can use it to supply your node with funds.

Sending funds to your account

zkSync

So far the only supported way to enable your requestor wallet to operate on zkSync is to reach out to us to get your address funded with some GLM tokens.

Using the address you obtained in the previous section, reach out to us on our Discord at https://chat.golem.network where, after a short verification process, you'll be issued some GLM tokens directly to your zkSync wallet and your Golem node will be good to go!

The same instruction, already containing your mainnet address can be obtained by running:

yagna payment fund --network=mainnet --driver=zksync

ERC-20

On the other hand, if you'd like to use the regular ERC-20 transactions to pay the providers, you'll need to supply your address with some actual GLM tokens, plus some ETH to pay for all the gas fees. Just use you regular wallet to send some GLM and ETH tokens to the node's address.

Again, you'll get the same instruction plus your mainnet address if you run:

yagna payment fund --network=mainnet --driver=erc20

Enable the mainnet account

In the current version though, the daemon is set-up to use Ethereum's Rinkeby testnet by default. Also, all accounts are initialized in the receiver mode by default so you need to enable them as a sender (that's the reason we're adding the --sender flag below).

Thus, in order to enable the daemon to use the mainnet, you'll need to tell it so using:

yagna payment init --sender --network==mainnet --driver=zksync

or

yagna payment init --sender --network=mainnet --driver=erc20

to enable the zkSync or the ERC-20 mainnet drivers respectively.

Checking the status of your accounts

Depending on whether you're mainly running a provider node or a requestor one, your default network (blockchain) may be different.

Because of that, when you run yagna payment status to verify the state of your payment account and the amount of GLM tokens you have in your disposal, you may need to add the specific network and driver parameters to point to the network/driver combination that you're interested in.

In the context of running Golem on mainnet, that would mean using:

yagna payment status --network=mainnet --driver=zksync

to retrieve the status for the default zkSync (Layer2) driver, or:

yagna payment status --network=mainnet --driver=erc20

to see the status for the ERC-20 driver.

Getting your funds out of the Golem node

zkSync

If you'd like to convert your GLM tokens on zkSync back to regular ERC-20 GLM tokens on the Ethereum blockchain, you need to exit the zkSync Layer2.

There are two ways you may perform this operation. In the first case, you may exit from zkSync to the same address. As a result, your GLM tokens will once more become regular ERC-20 tokens and will stay within the same wallet they were in. To do that, just issue the following command:

yagna payment exit --network=mainnet

The alternative option is to provide an address to which the exit should be performed. That way, instead of sending the tokens to the address the request was signed by, zkSync will send them to the address you have provided. This is especially useful if you no longer need to use the GLM tokens within the Golem network and would rather have them back on your regular cryptocurrency wallet that may be completely independent of Golem. The command you need is:

yagna payment exit --to-address=YOUR-ETHEREUM-ADDRESS --network=mainnet

ERC-20

We don't currently support direct, ERC-20 withdraws from the Golem wallet. Soon, we will add functionality that will enable you to export your wallet and import it into MetaMask and you'll be able to withdraw your ERC-20 tokens that way.

Backing up your Golem wallet

As you're probably aware, in the Ethereum universe, your funds are only as secure as the private key for the account that holds them. Because of that, to ensure that you don't lose access to your GLM/ETH tokens stored on your Golem account, it's crucial for you to be able to back-up your Golem wallet and store the key in a safe storage, separate from the node itself.

To create a backup of your Golem wallet, export the keystore with:

yagna id export --file-path=./key.json

The resultant key.json file in the directory you ran the command from will contain the private key for your Golem wallet.

Once the file is created, examine its contents and ensure that the address property in it is identical to the address of your node's Ethereum address. Normally there's no reason for this field to differ - but treat this step as a redundant check to ensure that you have backed up what you intended to back-up.

Restoring your backed-up Golem wallet

If, for whatever reason, your Golem wallet is destroyed or corrupted e.g. you moved on to a new machine and forgot to take move Golem's installation with it, you'll be faced with the necessity to recover your wallet from your previously backed-up keystore file.

To restore your wallet, first start with a fresh yagna install:

curl -sSf https://join.golem.network/as-requestor | bash -

Once yagna is installed, run it with:

yagna service run

Now, as usual, leave the daemon running in the background and proceed with the rest of the process in another terminal window.

Retrieve your keystore

Here you'll need the key.json file you had previously backed up. Do whatever you need to restore it - e.g. decrypt it if you previously encrypted it. For the process to work, it must be the same plain-text json file that yagna originally exported.

Be sure that your key.json file is in your current working directory and run:

yagna id create --from-keystore ./key.json

This should create a new identity in yagna based on your backed-up wallet.

Set the new identity as yagna's default

1. Using the Ethereum address of your backed-up wallet, run:

yagna id update --set-default 0x-the-address

2. STOP YOUR YAGNA DAEMON

(just press Ctrl-C in the console that's running yagna service run and wait for the daemon to exit)

3. Remove yagna's accounts configuration file

rm $HOME/.local/share/yagna/accounts.json

rm $HOME/Library/Application\ Support/GolemFactory.yagna/accounts.json

del %APPDATA%\GolemFactory\yagna\data\accounts.json

1. Start your yagna daemon again (as usual, do it in a separate command line terminal and allow it to run in the background)

yagna service run

5. Ensure yagna is using your newly-restored wallet

yagna id show

The nodeId property should display the Ethereum address of your backed-up wallet.

Running your requestor on mainnet

After you have taken care of the above, the one last thing that you'll need to do if you want to request tasks from the providers running on the mainnet is enabling the mainnet driver in your requestor agent.

The examples we bundle with our APIs (the Blender rendering and Hashcat password recovery) expose two command-line arguments, analogous to yagna daemon itself: --driver and --network.

Therefore, in order to run them on mainnet, you'd launch them using e.g.:

python3 blender.py --network=mainnet

python3 yacat.py '?a?a?a' '$P$5ZDzPE45CLLhEx/72qt3NehVzwN2Ry/' --network=mainnet --number-of-providers 4 --log-file yacat-debug.log

yarn js:blender --network mainnet

Requestor agent code

As for your own requestor agent code, you'll need to supply appropriate driver and network parameters to the Executor .

async with Executor(
    [...],
    network="mainnet",
    driver="zksync",
)

new Executor({
    driver: "zksync",
    network: "mainnet",
})