This guide outlines the steps for performing a liquid delegation to a preferred node operator as a user of the Node Cloud.

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Install k2-sdk and ethers

yarn add @blockswaplab/k2-sdk ethers@6.9.0

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Importing the libraries

const { ethers } = require('ethers');
const { K2 } = require("@blockswaplab/k2-sdk");

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Initialising the SDK

The SDK uses version 6 of the ethers.js library and it is recommended to use this library to create a provider and a signer instance, required for signing the transaction. You can use any provider API that you want from this list. For this tutorial, Infura is used. 
const provider = new ethers.InfuraProvider(
    "goerli",
    INFURA_PROJECT_ID,
    INFURA_PROJECT_SECRET
);

const signer = new ethers.Wallet(PRIV_KEY, provider);
Once the provider and signer instances are created, next initialize the K2 SDK. 
const sdk = new K2(signer);
The K2 SDK also takes other parameters as input but they are optional, only the Signer is required for liquid delegation.

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Approve the Lien contract

Before liquid delegation, you must approve the lien contract by passing the lien contract address to the following function: 
const tx = await sdk.k2Lending.setDelegatedRecipient(lienContractAddress);
Once this transaction is successful, we can proceed with the liquid delegation.

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Liquid Delegation to a PNO using your K2 LP Balance

For liquid delegation to either a different PNO or yourself, the following functions from the pno sub-class can be used:

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Delegate to another PNO

You can delegate your K2 LP to a PNO by calling the following function: 
const tx = await sdk.pno.reDelegateToPreferredNodeOperator(pnoAddress, amount);
where amount is the amount of K2 LP to be delegated in string.

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Delegate to yourself

Assuming your signer wallet address is the same as the one used for registering your validator, you can delegate to yourself by calling: 
const tx = await sdk.pno.reDelegateToPreferredNodeOperator(signer.address, amount);
If the validator was registered using a different address, please use that address in place of signer.address

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Liquid Delegation to a PNO from Native Delegation balance

The max liquid delegation you can give to any PNO is 24 ETH * number of native delegations.
For liquid delegation to either a different PNO or yourself from Native Delegation balance, the following functions from the pno sub-class can be used:

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Delegate to another PNO

You can delegate to a PNO by calling the following function: 
const tx = await sdk.pno.reDelegateToPreferredNodeOperatorFromNativeDelegation(
    pnoAddress,
    amountToRedelegateInETH
)

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Delegate to yourself

Assuming your signer wallet address is the same as the one used for registering your validator, you can delegate to yourself by calling: 
const tx = await sdk.pno.reDelegateToPreferredNodeOperatorFromNativeDelegation(
    signer.address,
    amountToRedelegateInETH
)
If the validator was registered using a different address, please use that address in place of signer.address