KardanovIR

# In this example multiple accounts can deposit their funds and safely take them back.
# User balances are stored in the dApp state as mapping `address => waves`.

{-# STDLIB_VERSION 4 #-}
{-# CONTENT_TYPE DAPP #-}
{-# SCRIPT_TYPE ACCOUNT #-}

@Callable(i)
func deposit() = {
   # deposit function can be invoked from UI by user to top up the balance

KardanovIR

KardanovIR

strict z = Invoke(dapp,func,args,[AttachedPayment(unit,100000000)])
// Invoke(dApp: Address|Alias, function: String, arguments: List[Boolean|ByteVector|Int|String|List[Boolean|ByteVector|Int|String]], payments: List[AttachedPayments]): T|Unit

KardanovIR

(
   [
      ScriptTransfer(i.caller,100,unit)
   ],
   42
)

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 func findString(a: Any) = {
  match a {
    case a: String => a
    case a: List[Any] =>
      match a[0] {
        case b: String => b
        case _ => throw("Data is not a string")
      }
    case _ => throw("Data is not a string")
  }

KardanovIR

let allTransactions: Array<any> = [];
let response: any;
let after: null | string = null;

do {
    let url = `https://api.wavesplatform.com/v0/transactions/invoke-script?timeStart=2021-10-20T12%3A00%3A00.000Z&dapp=3PAETTtuW7aSiyKtn9GuML3RgtV1xdq1mQW&function=buyPerch&sort=desc&limit=100`;
    if (after) {
        url += `&after=${after}`
    }
    response = (await axios.get(url)).data;

KardanovIR

import { address as decodeAddress, concat, stringToBytes, verifySignature } from '@waves/ts-lib-crypto';
import { verifyCustomData } from '@waves/waves-transactions';


export function verifyAuthentication(signature: string, publicKey: string, address: string): string | null {
    const signedByAddress = decodeAddress({ publicKey });
    const messageBytes = stringToBytes(address);
    const authDataString = concat([255, 255, 255, 1], messageBytes);
    if (
        verifyCustomData({