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<!DOCTYPE html>
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https://neo.org/
Want to make this site better?
https://github.com/neo-project/neo.org
-->
<html lang="en">
<head prefix="og: http://ogp.me/ns#">
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<meta name="description" content='Neo is an open-source, community driven platform that is leveraging the intrinsic advantages of blockchain technology to realize the optimized digital world of the future.'>
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<title>Neo Smart Economy</title>
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<body id="neo-body">
<nav class="navbar smart-scroll container-fluid navbar-expand-lg">
<div class="container">
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<li class="nav-item" style="position: relative;">
<a class="nav-link dropdown-toggle" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Discover Neo
</a>
<div class="dropdown-menu p-2" aria-labelledby="dropdownMenuButton">
<i class="iconfont">&#xeb21;</i>
<div class="row text-center text-md-left">
<div class="col-md-6">
<a class="dropdown-item my-1 py-2 my-md-2 py-md-3" href="/about">
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<strong>Neo Defined</strong>
<span>Learn about the Neo project</span>
</div>
</a>
</div>
<div class="col-md-6">
<a class="dropdown-item my-1 py-2 my-md-2 py-md-3" href="/technology">
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<div>
<strong>Neo Technology</strong>
<span>Explore the features</span>
</div>
</a>
</div>
<div class="col-md-6">
<a class="dropdown-item my-1 py-2 my-md-2 py-md-3" href="/neogas">
<img src="https://neo-web.azureedge.net/images/nav-2.png" />
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<strong>NEO & GAS</strong>
<span>Neo’s unique dual token model</span>
</div>
</a>
</div>
<div class="col-md-6">
<a class="dropdown-item my-1 py-2 my-md-2 py-md-3" href="/contributors">
<img src="https://neo-web.azureedge.net/images/nav-4.png" />
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<strong>Contributors</strong>
<span>A global effort</span>
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</a>
</div>
</div>
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</li>
<li class="nav-item"><a class="nav-link" href="/gov">Governance</a></li>
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<a style="font-size: .9em; font-weight: 500" class="nav-link" href="javascript:" onclick="setLanguage('zh-cn')">中文</a>
</li> </ul>
</div>
</div>
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<div class="container layout-container">
<div class="migration-div d-none d-md-block">
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<p class="migration-text tw-flex tw-gap-1 tw-text-lg tw-font-semibold">
<img src="https://neo-web.azureedge.net/images/presskit/Neo symbol.svg" />
MIGRATE TO N3
</p>
</a>
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<div class="neox">
<div class="lt"></div>
<div class="lb"></div>
<div class="x"></div>
<div class="container">
<div class="row">
<div class="col-lg-6 pt-5">
<div class="work-sans-bold">
<h1 class="uppercase">
Introducing:<br />
Neo X
</h1>
</div>
<div class="work-sans-semibold my-4 uppercase ls3">
Neo’s EVM-based sidechain is here.<br />
Find out what opportunities await.
</div>
<div class="my-4">
<a href="https://x.neo.org/" target="_blank" class="btn-2">LEARN MORE</a>
</div>
<div class="work-sans-bold my-4">Latest News:</div>
<div class="my-4">
<a class="news-link" href="/blog/details/4317">Neo X Grind Hackathon kicks off for EVM innovators with over $22 million in prizes and grants <i class="iconfont circle-arrow-icon">&#xe6ab;</i></a>
</div>
</div>
</div>
</div>
</div>
<div class="row horiz-row aio-row">
<div class="col-12 col-md-12">
<div class="aio-title d-none-zh">
<span class="green">All</span> in One - <span class="green">All</span> in Neo
</div>
<div class="aio-title d-none">
<span class="green">All</span> in One - <span class="green">All</span> in Neo
</div>
<div class="highlight-container">
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/Interoperability.svg" />
<div class="highlight-name">Interoperability</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/NativeOracles.svg" />
<div class="highlight-name">Native Oracles</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/Self-SovereignID.png" />
<div class="highlight-name">Self-Sovereign ID</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/DecentralizedStorage.svg" />
<div class="highlight-name">Decentralized Storage</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/NativeNameService.svg" />
<div class="highlight-name">Neo Name Service</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/OneBlockFinality.svg" />
<div class="highlight-name">One Block Finality</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/BestInClassTooling.svg" />
<div class="highlight-name">Best-In-Class Tooling</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/SmartContracts.svg" />
<div class="highlight-name">Smart Contracts</div>
</div>
<div class="highlight-wrapper">
<img class="highlight-img png" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/Multi-Language.png" />
<div class="highlight-name">Multi-Language</div>
</div>
</div>
<div class="additional-button-wrapper">
<a class="btn-2" target="_blank" href="/tour">Take A Tour</a>
</div>
</div>
</div>
<div class="row dual-row get-started-row">
<div class="col-12 col-md-6 col-left">
<div class="get-started-title">
<span class="green">Neo</span> is
<br />
new again
</div>
<div class="explanation">
After four years of stable MainNet operation, Neo is undergoing its biggest evolution as it migrates to N3 - The most powerful and feature rich version of the Neo blockchain to date.
</div>
<a class="btn-2" href="/migration">Learn More</a>
<div class="additional-button-wrapper">
<a class="btn-2" target="_blank" href="/tour">Take A Tour</a>
</div>
</div>
<div class="col-12 col-md-6 col-right">
<div class="get-started-wrapper">
<a class="float-card" href="/neogas#wallets">
<div class="card-text-wrapper">
<div class="green-vertline"></div>
<div class="card-text">
Find a Wallet
</div>
</div>
<img class="card-img" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/FindWallet.svg" />
</a>
<a class="float-card" href="/neogas#tokens">
<div class="card-text-wrapper">
<div class="green-vertline"></div>
<div class="card-text">
Neo & Gas Tokens
</div>
</div>
<img class="card-img" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/LearnTokens.svg" />
</a>
<a class="float-card" href="/technology">
<div class="card-text-wrapper">
<div class="green-vertline"></div>
<div class="card-text">
Neo's Features
</div>
</div>
<img class="card-img" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/LearnFeatures.svg" />
</a>
<a class="float-card" href="https://developers.neo.org/docs">
<div class="card-text-wrapper">
<div class="green-vertline"></div>
<div class="card-text">
Documentation
</div>
</div>
<img class="card-img" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/ReadDocumentation.svg" />
</a>
</div>
</div>
</div>
<div class="building-blocks-container">
<div class="building-blocks-row">
<div class="col-left">
<div class="caption-square-container building-blocks">
<div class="caption-square-inner-wrapper">
<div class="title"><em>Building Blocks</em> for the Next Generation Internet</div>
</div>
</div>
</div>
<div class="col-right">
<span>
<span class="building-blocks-subtitle">
Neo provides a full stack of features out of the box, but doesn't keep you boxed in.
</span>
<br /><br />
<span class="building-blocks-body">
Native functionality provides all the infrastructure you need to build complete decentralized applications, while advanced interoperability allows you to harness the power of the global blockchain ecosystem.
</span>
</span>
<a class="btn-2 building-blocks-btn" href="/technology#all-in-one">Learn More</a>
</div>
</div>
<div class="neo-features-container">
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/OneBlockFinality3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
One Block Finality
</div>
<div class="block-paragraph">
dBFT consensus mechanism guarantees fast and efficient finality in a single block.
</div>
</div>
</div>
</div>
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/NativeOracles3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
Oracle
</div>
<div class="block-paragraph">
A built-in oracle enabling secured access to any off-chain data.
</div>
</div>
</div>
</div>
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/NeoFS3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
NeoFS
</div>
<div class="block-paragraph">
A distributed data storage solution made for scalability and privacy.
</div>
</div>
</div>
</div>
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/SmartContracts3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
Smart Contracts
</div>
<div class="block-paragraph">
Write your smart contracts in C#, Go, Python, Java, or TypeScript.
</div>
</div>
</div>
</div>
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/NeoNameService3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
Neo Name Service
</div>
<div class="block-paragraph">
A decentralized .neo domain name service for next-gen internet web applications.
</div>
</div>
</div>
</div>
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/Interoperability3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
Interoperability
</div>
<div class="block-paragraph">
Poly.Network enabled cross-chain interoperability with Ethereum, Binance Chain, and more.
</div>
</div>
</div>
</div>
<div class="neo-feature-item">
<div class="block-wrapper">
<div class="block-icon-wrapper">
<img src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/NeoID3D.svg" />
</div>
<div class="block-content-wrapper">
<div class="block-title">
<i class="iconfont circle-arrow-icon">&#xe6ab;</i>
NeoID
</div>
<div class="block-paragraph">
A set of self-sovereign decentralized identity solution standards.
</div>
</div>
</div>
</div>
</div>
<div class="blockchain-caption-square-row">
<div class="caption-square-container blockchain">
<div class="caption-square-inner-wrapper">
<div class="title"><em>Blockchain</em><br />You know</div>
<div class="subtitle">
Write smart contracts in a language you already love
</div>
</div>
</div>
<a class="btn-2 code-learn-more" href="/technology#smart-contracts">Learn More</a>
</div>
</div>
<div class="code-example-row">
<div class="language-list">
<div class="language-wrapper">
<div class="language-name">
Python
</div>
<div class="language-icon python" data-lang="python">
<img class="language-img dark" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/PythonDark.png?v=FA87DB6277DE398911235F4E6CA8BB2B70A049A0736A99DCA2446FE8E25C4FE1" />
<img class="language-img light" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/Python.png?v=F27CA4EF53EEEB69D69F8A327F7E4B97835F3C4F9A224874163B8856F176B32E" />
</div>
</div>
<div class="language-wrapper">
<div class="language-name">
C#
</div>
<div class="language-icon csharp" data-lang="csharp">
<img class="language-img dark" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/CSharpDark.png?v=1E83E06BE355719937418DF9F4566E8B692B75BDA1183FB0E1217B8D72D25038" />
<img class="language-img light" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/CSharp.png?v=C9496386014700D21E30EE1BD6C1C47F5A46EFB47F5DF8955FEAA3263D9758C2" />
</div>
</div>
<div class="language-wrapper">
<div class="language-name">
Go
</div>
<div class="language-icon go" data-lang="go">
<img class="language-img dark" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/GoDark.png?v=DE7AA8958667FB5445A874E59BDADBDB5A2EB3D6EDE70E5CFC699BFBD6471BCB" />
<img class="language-img light" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/Go.png?v=18D18CBCA8DC5822AB6CDE1D19997C340A4D699BEDEA35824DB5EADA8D4C7023" />
</div>
</div>
<div class="language-wrapper">
<div class="language-name">
Typescript
</div>
<div class="language-icon typescript" data-lang="typescript">
<img class="language-img dark" src="https://neo-web.azureedge.net/images/transparent.png" data-original="https://neo-web.azureedge.net/images/home/TypescriptDark.png?v=1993D830082C3EAD058D0E1E828CDEB707E3319DCAFCD58EF674BA6C36B0A837" />
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<pre class="green code">
<code>
from boa3.builtin.contract import Nep17TransferEvent, abort
&#64;metadata
def manifest_metadata() -> NeoMetadata:
meta = NeoMetadata()
meta.author = "coz"
return meta
OWNER = UInt160(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
TOKEN_TOTAL_SUPPLY = 100_000_000 * 100_000_000 # 10m total supply * 10^8 (decimals)
# Events
on_transfer = Nep17TransferEvent
&#64;public
def transfer(from_address: UInt160, to_address: UInt160, amount: int, data: Any) -> bool:
assert len(from_address) == 20 and len(to_address) == 20
assert amount >= 0
# The function MUST return false if the from account balance does not have enough tokens to spend.
from_balance = get(from_address).to_int()
if from_balance < amount:
return False
# The function should check whether the from address equals the caller contract hash.
if from_address != calling_script_hash:
if not check_witness(from_address):
return False
# skip balance changes if transferring to yourself or transferring 0 cryptocurrency
if from_address != to_address and amount != 0:
if from_balance == amount:
delete(from_address)
else:
put(from_address, from_balance - amount)
to_balance = get(to_address).to_int()
put(to_address, to_balance + amount)
on_transfer(from_address, to_address, amount)
# if the to_address is a smart contract, it must call the contract's onPayment method
post_transfer(from_address, to_address, amount, data)
return True
</code>
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using Neo;
using Neo.SmartContract;
using Neo.SmartContract.Framework;
using Neo.SmartContract.Framework.Attributes;
using Neo.SmartContract.Framework.Native;
using Neo.SmartContract.Framework.Services;
using System;
using System.Numerics;
namespace Desktop
{
[ManifestExtra("Author", "Neo")]
[ManifestExtra("Email", "dev@neo.org")]
[ManifestExtra("Description", "This is a contract example")]
[ContractSourceCode("https://github.com/neo-project/neo-devpack-dotnet/tree/master/src/Neo.SmartContract.Template")]
public class Contract1 : SmartContract
{
//TODO: Replace it with your own address.
[InitialValue("NiNmXL8FjEUEs1nfX9uHFBNaenxDHJtmuB", ContractParameterType.Hash160)]
static readonly UInt160 Owner = default;
private static bool IsOwner() => Runtime.CheckWitness(Owner);
// When this contract address is included in the transaction signature,
// this method will be triggered as a VerificationTrigger to verify that the signature is correct.
// For example, this method needs to be called when withdrawing token from the contract.
public static bool Verify() => IsOwner();
// TODO: Replace it with your methods.
public static string MyMethod()
{
return Storage.Get(Storage.CurrentContext, "Hello");
}
public static void _deploy(object data, bool update)
{
if (update) return;
// It will be executed during deploy
Storage.Put(Storage.CurrentContext, "Hello", "World");
}
public static void Update(ByteString nefFile, string manifest)
{
if (!IsOwner()) throw new Exception("No authorization.");
ContractManagement.Update(nefFile, manifest, null);
}
public static void Destroy()
{
if (!IsOwner()) throw new Exception("No authorization.");
ContractManagement.Destroy();
}
}
}
</code>
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<pre class="green code">
<code>
package nep17Contract
var (
token nep17.Token
ctx storage.Context
)
// initializes the Token Interface and storage context
func init() {
token = nep17.Token{
...
Name: "Nep17 example",
Owner: util.FromAddress("NdHjSPVnw99RDMCoJdCnAcjkE23gvqUeg2"),
TotalSupply: 10000000000000000
}
ctx = storage.GetContext()
}
// Transfer token from one user to another
func (t Token) Transfer(ctx storage.Context, from, to interop.Hash160, amount int, data interface{}) bool {
amountFrom := t.CanTransfer(ctx, from, to, amount)
if amountFrom == -1 {
return false
}
if amountFrom == 0 {
storage.Delete(ctx, from)
}
if amountFrom > 0 {
diff := amountFrom - amount
storage.Put(ctx, from, diff)
}
amountTo := getIntFromDB(ctx, to)
totalAmountTo := amountTo + amount
storage.Put(ctx, to, totalAmountTo)
runtime.Notify("Transfer", from, to, amount)
if to != nil && management.GetContract(to) != nil {
contract.Call(to, "onNEP17Payment", contract.All, from, amount, data)
}
return true
}
</code>
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<pre class="green code">
<code>
import { SmartContract} from '&#64;neo-one/smart-contract';
export class NEP17Contract extends SmartContract {
public readonly properties = {
name: 'NEO•ONE NEP17 Example',
groups: [],
trusts: '*',
permissions: [],
};
public readonly name = 'NEO•ONE NEP17 Example';
public readonly decimals = 8;
private readonly notifyTransfer = createEventNotifier&lt;Address | undefined, Address | undefined, Fixed&lt;8&gt;&gt;(
'Transfer', 'from', 'to', 'amount',
);
public transfer(from: Address, to: Address, amount: Fixed&lt;8&gt;, data?: any): boolean {
if (amount < 0) {throw new Error(&#96;Amount must be greater than 0: $&#123;amount&#125;&#96;);}
const fromBalance = this.balanceOf(from);
if (fromBalance < amount) { return false; }
const contract = Contract.for(to);
if (contract !== undefined && !Address.isCaller(to)) {
const smartContract = SmartContract.for&lt;TokenPayableContract&gt;(to);
if (!smartContract.approveReceiveTransfer(from, amount, this.address)) {
return false;
}
}
const toBalance = this.balanceOf(to);
this.balances.set(from, fromBalance - amount);
this.balances.set(to, toBalance + amount);
this.notifyTransfer(from, to, amount);
if (contract !== undefined) {
const smartContract = SmartContract.for&lt;TokenPayableContract&gt;(to);
smartContract.onNEP17Payable(from, amount, data);
}
return true;
}
}
</code>
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<pre class="green code">
<code>
package io.neow3j.examples.contractdevelopment.contracts;
import static io.neow3j.devpack.StringLiteralHelper.addressToScriptHash;
import io.neow3j.devpack.*
@ManifestExtra(key = "name", value = "FungibleToken")
@ManifestExtra(key = "author", value = "AxLabs")
@SupportedStandards("NEP-17")
@Permission(contract = "fffdc93764dbaddd97c48f252a53ea4643faa3fd") // ContractManagement
public class FungibleToken {
static final Hash160 owner = addressToScriptHash("NM7Aky765FG8NhhwtxjXRx7jEL1cnw7PBP");
@DisplayName("Transfer")
static Event3Args<Hash160, Hash160, Integer> onTransfer;
static final int initialSupply = 200_000_000;
static final int decimals = 8;
static final String assetPrefix = "asset";
static final String totalSupplyKey = "totalSupply";
static final StorageContext sc = Storage.getStorageContext();
static final StorageMap assetMap = sc.createMap(assetPrefix);
public static String symbol() {
return "FGT";
}
public static int decimals() {
return decimals;
}
public static int totalSupply() {
return getTotalSupply();
}
static int getTotalSupply() {
return Storage.getInteger(sc, totalSupplyKey);
}
public static boolean transfer(Hash160 from, Hash160 to, int amount, Object[] data)
throws Exception {
if (!Hash160.isValid(from) || !Hash160.isValid(to)) {
throw new Exception("From or To address is not a valid address.");
}
if (amount < 0) {
throw new Exception("The transfer amount was negative.");
}
if (!Runtime.checkWitness(from) && from != Runtime.getCallingScriptHash()) {
throw new Exception("Invalid sender signature. The sender of the tokens needs to be "
+ "the signing account.");
}
if (getBalance(from) < amount) {
return false;
}
if (from != to && amount != 0) {
deductFromBalance(from, amount);
addToBalance(to, amount);
}
onTransfer.fire(from, to, amount);
if (ContractManagement.getContract(to) != null) {
Contract.call(to, "onNEP17Payment", CallFlags.All, data);
}
return true;
}
public static int balanceOf(Hash160 account) throws Exception {
if (!Hash160.isValid(account)) {
throw new Exception("Argument is not a valid address.");
}
return getBalance(account);
}
@OnDeployment
public static void deploy(Object data, boolean update) throws Exception {
throwIfSignerIsNotOwner();
if (!update) {
if (Storage.get(sc, totalSupplyKey) != null) {
throw new Exception("Contract was already deployed.");
}
// Initialize supply
Storage.put(sc, totalSupplyKey, initialSupply);
// And allocate all tokens to the contract owner.
assetMap.put(owner.toByteArray(), initialSupply);
}
}
public static void update(ByteString script, String manifest) throws Exception {
throwIfSignerIsNotOwner();
if (script.length() == 0 && manifest.length() == 0) {
throw new Exception("The new contract script and manifest must not be empty.");
}
ContractManagement.update(script, manifest);
}
public static void destroy() throws Exception {
throwIfSignerIsNotOwner();
ContractManagement.destroy();
}
@OnVerification
public static boolean verify() throws Exception {
throwIfSignerIsNotOwner();
return true;
}
/**
* Gets the address of the contract owner.
*
* @return the address of the contract owner.
*/
public static Hash160 contractOwner() {
return owner;
}
private static void throwIfSignerIsNotOwner() throws Exception {
if (!Runtime.checkWitness(owner)) {
throw new Exception("The calling entity is not the owner of this contract.");
}
}
private static void addToBalance(Hash160 key, int value) {
assetMap.put(key.toByteArray(), getBalance(key) + value);
}
private static void deductFromBalance(Hash160 key, int value) {
int oldValue = getBalance(key);
if (oldValue == value) {
assetMap.delete(key.toByteArray());
} else {
assetMap.put(key.toByteArray(), oldValue - value);
}
}
private static int getBalance(Hash160 key) {
return assetMap.getInteger(key.toByteArray());
}
}
</code>
</pre>
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<br /><br /> GAS is used to pay for network fees, smart contract deployments, and in dApp purchases.
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would receive up to
</div>
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<div class="result-col result-col-neo">
<div class="result-num result-holding ngc-result-holding">0.44</div>
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data-original="https://neo-web.azureedge.net/images/home/Gas-Symbol.svg" />
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Gas Per Month<span class="green">*</span>
</div>
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</div>
<div class="plus-sign"><i class="iconfont">&#xe603;</i></div>
<div class="result-col result-col-gas">
<div class="result-num result-governance ngc-result-governance">17.52</div>
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data-original="https://neo-web.azureedge.net/images/home/Gas-Symbol.svg" />
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</div>
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</div>
</div>
<div class="foot-note">
<span class="green">*</span>estimate based on average 20% circulating NEO voting participation
</div>
</div>
</div>
<script>
document.addEventListener('DOMContentLoaded', function () {
$("#calculator-slider").on("input", function (e) {
const { value } = e.currentTarget
$(".ngc-slider-current-value").html(value)
const holdingGas = (+value * 10512000 * 0.1 / 100000000 / 12).toFixed(2)
const governanceGas = (+value * 10512000 * 0.8 / 20000000 / 12).toFixed(2)
$(".ngc-result-holding").html(holdingGas)
$(".ngc-result-governance").html(governanceGas)
})
})
</script>
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$(".github-forks").html(forks);
const subCount = +(data.subscribers_count);
const sub = subCount > 1000 ? `${(subCount / 1000).toFixed(1)}K` : `${subCount}`
$(".github-sub").html(sub);
});
} catch {
console.log('Failed to get GitHub status.')
}
});
$(".language-icon").on("click", function () {
$(".language-icon.selected").removeClass("selected")
const $el = $(this)
$el.addClass("selected")
const lang = $el.data("lang")
$(".code-window").addClass("d-none")
$("#code-" + lang).removeClass("d-none")
$('html').attr('data-code-window-open', lang)
})
const scrollDistance = 300;
function debounce(func, wait, immediate) {
var timeout;
return function () {
var context = this, args = arguments;
var later = function () {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
};
$("#scroll-wrapper").on("scroll", debounce(function (e) {
const scrollWrapper = $("#scroll-wrapper")
console.log(scrollWrapper.scrollLeft(), scrollWrapper.innerWidth());
if (scrollWrapper.scrollLeft() > 0) {
$("#scroll-left-btn").removeClass("disabled")
} else {
$("#scroll-left-btn").addClass("disabled")
}
if (scrollWrapper.scrollLeft() + 8 < scrollWrapper.width()) {
$("#scroll-right-btn").removeClass("disabled")
} else {
$("#scroll-right-btn").addClass("disabled")
}
}, 50))
$("#scroll-left-btn").click(function (e) {
if ($(this).hasClass("disabled")) {
e.preventDefault();
return;
}
$("#scroll-wrapper").animate({
scrollLeft: "-=" + scrollDistance
}, 650)
})
$("#scroll-right-btn").click(function (e) {
if ($(this).hasClass("disabled")) {
e.preventDefault();
return;
}
$("#scroll-wrapper").animate({
scrollLeft: "+=" + scrollDistance
}, 650)
})
$(".close-icon").on("click", function () {
$(".language-icon.selected").removeClass("selected");
$(".code-window").addClass("d-none")
$('html').removeAttr('data-code-window-open')
})
</script>
<script>
var scroll_active_top = 650;
</script>
</body>
</html>
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