# Why Shibuya using the wrong chainID so many years? **URL:** \ **Category:** General\ **Created:** [May 3, 2024, 12:21am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766 "2024-05-03T00:21:52Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Shiden](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/shiden/32/2838_2.png) [@Shiden](https://forum.astar.network/u/Shiden)\ **Post date:** [May 3, 2024, 12:21am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/1 "2024-05-03T00:21:52Z")
I posted this topic in discord ( Japan channel ). And now asking core team about it through an agent. Waiting for answer. I think it should be shared with non-Japanese people as well. Astar testnet, Shibuya using wrong chainID( **81** ) long time( from start ). It belong to **Japan Open Chain Mainnet** , officially. > **[Chainlist](https://chainid.network/)** > > A list of EVM-based chains that also allows you to add chains to your favorite Web3 wallet. Many developper know about it, but they don’t point it out or improve it. I don’t know why? Considering the future multi-chain era, I don’t think this will continue as it is. JOC( [Japan Open Chain](https://www.japanopenchain.org/en/) ) has recently become more active. And many web3 & data tools don’t work well from this( wrong chainID ). ✨ We can’t choose Shibuya, **Shibuya doesn’t officially exist.** ✨ 😭 For example I use LayerZeroScan ( [https://layerzeroscan.com/](https://layerzeroscan.com/) ) to check the status of the bridge problem, JOC Mainnet & Astar testnet are same chainID, so it don’t work well. In a simpler case, user can’t use Metamask, JOC & Shibuya chain at the same time ( or **can’t use unofficial Shibuya chain** in the future ). ---
**Author:** ![Maarten](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/maarten/32/4735_2.png) [@Maarten](https://forum.astar.network/u/Maarten)\ **Post date:** [May 3, 2024, 6:36am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/2 "2024-05-03T06:36:05Z")
> [@Shiden](#): > > Astar testnet, Shibuya using wrong chainID( **81** ) long time( from start ). > It belong to **Japan Open Chain Mainnet** , officially. A better question would be, why did JOC choose for a ChainID that already exist. They are making it very difficult now for them and their users. When we registered Shibuya, ChainID 81 was free. Can you explain more, why this was wrong at that time to take 81? ---
**Author:** ![souleater](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/souleater/32/210_2.png) [@souleater](https://forum.astar.network/u/souleater)\ **Post date:** [May 3, 2024, 7:31am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/3 "2024-05-03T07:31:08Z")
The registration of a chain ID for EVM is actually is FCFS, the later team should be doing research before registering a chain ID. This kind of issue actually already being discussed years ago before the rising of EVM-based chain. And I agree with Maarten, that when Astar registered ID 81 is free, and no one is using it, and our Shibuya testnet was already existed from 3 years ago. ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [May 3, 2024, 10:11am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/4 "2024-05-03T10:11:43Z")
I don’t know why? But I think ChainID 81 is NOT belong to Astar( Plasm ) **officially** , Even if Shibuya was already existed from 3 years ago. I think. ( At least this two years long, **officially** , I know. Before that, I dont know. ) I’m just wondering, and I just want this problem to be resolved **as a user**. ❄ **DONT ask me ( Shiden = naoyo4 ) again !!** ❄ , Ask JOC or FCFS etc, please!! 🥰 ❄ **And answer it and solve it !!** ❄ AND DONT BAN US ANY MORE !! ( We need more accounts ?? on discord or telegram or forum ?? ) without any reason. Please!! 🥰 **Ask again, where is Shibuya officially exist ?** ---
**Author:** ![Gaius\_sama](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/gaius_sama/32/4741_2.png) [@Gaius\_sama](https://forum.astar.network/u/Gaius_sama)\ **Post date:** [May 3, 2024, 11:02am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/5 "2024-05-03T11:02:22Z")
Shibuya First Block was generated 3 years ago: 2021-09-06 14:14:00 (+UTC) > **[Subscan | Aggregate Substrate ecological network high-precision Web3 explorer](https://shibuya.subscan.io/block/1)** > > Subscan | Substrate ecological explorer: Search, analyze, and visualize blockchain that occurs on Substrate based network (Polkadot, Kusama, Moonbeam, Acala, Darwinia), such as extrinsics, transfers, accounts, tokens, prices, staking, PLO and other... Chain ID `81` was registered for Shibuya on 2021-09-06. ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [May 3, 2024, 11:30am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/6 "2024-05-03T11:30:21Z")
So, what ? Ask again, where is Shibuya **officially** exist ? > **[Chainlist](https://chainid.network/)** > > A list of EVM-based chains that also allows you to add chains to your favorite Web3 wallet. ---
**Author:** ![Gaius\_sama](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/gaius_sama/32/4741_2.png) [@Gaius\_sama](https://forum.astar.network/u/Gaius_sama)\ **Post date:** [May 3, 2024, 12:14pm UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/7 "2024-05-03T12:14:51Z")
To be exact, this ethereum repo [GitHub - ethereum-lists/chains: provides metadata for chains](https://github.com/ethereum-lists/chains) is where projects **can** register IDs. However, there is no central authority that controls chain IDs, anyone can use any number and the social consensus of first come, first served applies. In the case of JOP, they are taking a huge risk by using the existing Shibuya ID, as three years of transactions on Shibuya can now be replayed on the JOC chain, and they are therefore facing the risk of replay attacks on their chain. _Note: there are 6 million blocks on Shibuya, many of which contain EVM transactions that can be replayed._ > **[What is a Blockchain Replay Attack? 5 Most Common Types](https://www.cyfrin.io/blog/replay-attack-in-ethereum)** > > Learn what a blockchain replay attack is how it works through 5 common examples. Shibuya ID 81 was not registered on Chain at the time, as this is not a mandatory practice and was not common for testnet networks. However, mentions of Shibuya ID 81 on the internet were present since September 2021 and also in 2022. > **[Announcement: PolkaEx is partnering with Shiden Network to launch a stress...](https://polkaex.medium.com/announcement-polkaex-is-partnering-with-shiden-network-to-launch-a-stress-test-campaign-on-shibuya-59facad2f2f8)** > > During and After the just ended Dusty Testnet Campaign, we received a lot of valuable feedback to help optimize and iterate PolkaEx. This… > **[Test Campaign: The First Decentralized Auction Platform & Zero Code Token...](https://polkaex.medium.com/test-campaign-the-first-decentralized-auction-platform-zero-code-token-creation-on-astar-network-9a17d00c7826)** > > Create token with no codes, list on the Auction page and raise funds for your project. > **[How to add Astar to MetaMask | Mainnet & Testnet](https://www.blockmeadow.com/how-to-add-astar-to-metamask/)** > > In this guide, we show you how to connect Astar network to your MetaMask Wallet, both mainnet and testnet > > > \## Issue > > See also: #4779 > > So in addition to Etherscan, Sourcify, and Blocks…cout, \[Subscan\](https://www.subscan.io/) also supports contract verification. At least, on some of its networks; not on most of them. But it supports it on a few of them, and even some ones that Etherscan and Sourcify currently don't. > > (Note: One of these is Astar's Shibuya network, which uses chain ID 81, but which doesn't appear in any of the usual chain directories -- those list chain ID 81 as belonging to the Zenith testnet Vilnius...) > > Now, I haven't yet tried this out, so I don't actually know yet whether its API will suffice for our purposes. But, I should try this out later and report back on whether it's good enough. And if it is, then there should be a Subscan source fetcher! > > \## Environment > > \* Truffle version (\`truffle version\`): 5.6.5 > **[Sirius Finance Shibuya Testnet Guide: Step-by-Step Tutorial](https://medium.com/@siriusfinance/sirius-finance-shibuya-testnet-guide-step-by-step-tutorial-5accc0b3b4b5)** > > Hello, Siriusers! The debate is not about who owns chain ID 81 at the moment, but about the big risk to JOC of using an existing chain ID and therefore the risk for their ecosystem and users. ---
**Author:** ![tksarah](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/tksarah/32/1947_2.png) [@tksarah](https://forum.astar.network/u/tksarah)\ **Post date:** [May 3, 2024, 12:44pm UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/8 "2024-05-03T12:44:15Z")
Hi @Gaius_sama@Maarten @souleater, Thank you for the very informative advice. I thought it was a very important point. Regarding the topic of ID81, I have connections with the JOC, so I would like to share information with the relevant parties at JOC. I look forward to your continued support. ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [May 10, 2024, 4:12am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/9 "2024-05-10T04:12:58Z")
@tksarah Thank you for your contribution. Any progress ? 🙏 ---
**Author:** ![tksarah](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/tksarah/32/1947_2.png) [@tksarah](https://forum.astar.network/u/tksarah)\ **Post date:** [May 10, 2024, 5:12am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/10 "2024-05-10T05:12:39Z")
This issue sharing has already taken place and is currently being confirmed by the JOC. ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [May 13, 2024, 2:54am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/11 "2024-05-13T02:54:56Z")
Below is from JOC to me. I belong both community. 🍀 Original Japanese and translate to English by **GPT-4o**. お世話になっております。先日よりいただいておりました件についてご連絡いたしました。 チェーン81はAstar様含め、世界では過去には様々なテストチェーンが81番を利用した実績がございますが、最終的にはEthereum Foundationにて弊社のJapan Open Chainがメインネットとして正式認定されております。Ethereum Foundationが認定し管理するチェーンIDが事実上のデファクトとなっており、他のウォレットがそちらを正式なものとして採用することが一般的であるため、大変恐縮ですが他のテストチェーンを新しいIDで立て直していただくことが必要であると思われます。なお、Japan Open Chainのテストネットも、当初99999番で立てていたところ、すでにそのチェーンがEthereum Foundationに他のテストチェーンとして登録されていることが判明し、10081番のチェーンを立て直した実績もございます。その後10081番のテストチェーンとして、Ethereum Foundationに登録しております。 今後ともJapan Open Chainをよろしくお願いいたします。 Thank you for your continued support. I am writing to follow up on the matter we discussed previously. Regarding Chain 81, various test chains have historically used the number 81 globally, including those of Astar. However, our Japan Open Chain has been officially recognized as the mainnet by the Ethereum Foundation. The chain ID managed and certified by the Ethereum Foundation has effectively become the de facto standard. As a result, other wallets generally adopt this as the official chain ID. **Therefore, we regret to inform you that it is necessary to re-establish other test chains with a new ID.** Additionally, our Japan Open Chain testnet was initially set up with the ID 99999, but we discovered that this chain ID was already registered by the Ethereum Foundation for another test chain. Consequently, we re-established it with the chain ID 10081. This test chain with ID 10081 is also registered with the Ethereum Foundation. We appreciate your continued support of Japan Open Chain. ---
**Author:** ![tksarah](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/tksarah/32/1947_2.png) [@tksarah](https://forum.astar.network/u/tksarah)\ **Post date:** [May 13, 2024, 8:41am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/12 "2024-05-13T08:41:28Z")
@Gaius_sama@Maarten As posted in the forum by “Naoyo4,” the response I received from the JOC side was the same. I am translating from the Japanese version I received: “Chain 81, including Astar, has a history of various test chains using the number 81 worldwide. Ultimately, our Japan Open Chain has been officially recognized as the mainnet by the Ethereum Foundation. The chain ID managed and certified by the Ethereum Foundation has become the de facto standard. It is common for other wallets to adopt it as the official one. Therefore, we regret to inform you that it seems necessary to re-establish other test chains with new IDs. Additionally, the Japan Open Chain testnet was initially set up with the number 99999. However, it was discovered that this chain had already been registered with the Ethereum Foundation as another test chain, leading us to re-establish it with the chain number 10081. Since then, we have registered it as the test chain number 10081 with the Ethereum Foundation.” ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [May 14, 2024, 6:25am UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/13 "2024-05-14T06:25:06Z")
@Maarten @Gaius_sama We got answer from JOC. How about Astar Foundation ? Any Answer about it ? 🙏 ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [June 27, 2024, 10:52pm UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/14 "2024-06-27T22:52:38Z")
@Gaius_sama Is this your Answer ? What a **public** chain !! 😭 ![Screenshot from 2024-06-28 07-49-58](https://us1.discourse-cdn.com/flex020/uploads/plasmnet/original/2X/1/1d1af23a2837bc751e002ad45298874b3433a94f.png) ![Screenshot from 2024-06-28 07-49-14](https://us1.discourse-cdn.com/flex020/uploads/plasmnet/original/2X/d/d7280ab73d5a01dff24a0a96b847edaccd665cc9.png) ![Screenshot from 2024-06-28 07-49-26](https://us1.discourse-cdn.com/flex020/uploads/plasmnet/original/2X/d/d36d8dd14fdaceb6f2dc4706d6e5c590b7b28812.png) ---
**Author:** ![Gaius\_sama](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/gaius_sama/32/4741_2.png) [@Gaius\_sama](https://forum.astar.network/u/Gaius_sama)\ **Post date:** [June 28, 2024, 3:27pm UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/15 "2024-06-28T15:27:35Z")
What do you mean by that? Shibuya is a testnet. What does that have to do with whether it’s public or not? I have a lot of SBY because it’s my role to distribute to the faucet and to teams building on Shibuya when they need SBY. ---
**Author:** ![naoyo4](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.astar.network/naoyo4/32/970_2.png) [@naoyo4](https://forum.astar.network/u/naoyo4)\ **Post date:** [June 28, 2024, 11:09pm UTC](https://forum.astar.network/t/why-shibuya-using-the-wrong-chainid-so-many-years/6766/16 "2024-06-28T23:09:51Z")
I don’t understand you, it’s **Public** testnet. Please DO the minimum announcement & follow public rules. JOC Mainnet( official register of ChainID:81 ) is Japanese important Public Chain. Astar is NOT anymore. I feel sad because I used to support Astar. ❄ **So, What is your answer to JOC.** ❄ ( I & Agent must answer back to JOC. Please understand us , our position too. )