Example

DApp's backend

we can ask CUBE3 to validate transaction for us using cube3ValidateTransaction method from @cube3/sdk-nodejs library. For that, you need to set your apiKey, validationUrl.

import { cube3ValidateTransaction, Cube3Api, Cube3ValidationData } from '@cube-web3/sdk-nodejs'
import { ethers } from "ethers";

export class ValidationController {
    public static async validateTransaction(req: Request, res: Response) {
        const apiKey = "<...>"
        const validationUrl = "https://<...>/api/transaction/validate"

        const cube3ValidationData: Cube3ValidationData = {
            transactionData: req.body,
            clientIp: req.ip
        }

        const validation = await cube3ValidateTransaction(validationUrl, apiKey, cube3ValidationData)

        return res.status(200).send(JSON.stringify(cube3ValidationResponse))
    }
}

This is what validation returns

interface Cube3ValidationResponse {
    valid: boolean
    payload?: string
    error?: string
    combinedScore: number
    cube3TxId: string
}

After sending the transaction to the chain, we will save the transaction ID to the system. To do so, you will need a transaction ID and an internal CUBE3 transaction ID. However, we cannot do that on frontend because our API-KEY would get exposed. So, we will call dApp’s backend with receipt hash and internal CUBE3 transaction ID in body.

import { cube3ValidateTransaction, Cube3ValidationData } from '@cube3/sdk-nodejs'
import { ethers } from "ethers";

export class ValidationController {
    public static async saveTransaction(req: Request, res: Response) {
        const apiKey: "<...>",
        const saveTransactionUrl: "https://<...>/api/transaction"

        const transactionId = req.body.transactionId
        const cube3TxId = req.body.cube3TxId

        const response = await cube3SaveTransaction(saveTransactionUrl, apiKey, transactionId, cube3TxId)
        return res.status(200).send(JSON.stringify(response))
    }
}