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通貨オプション入門

通貨オプション入門

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What is bitcoin?

Learn how the largest cryptocurrency works, along with the key risks to understand.

  • Fidelity Active Investor
  • – 05/18/2022
  • 1000

Key takeaways

  • Digital currencies like bitcoin are different from traditional payment methods.
  • Bitcoin, which is the first and largest cryptocurrency, and its underlying blockchain technology have a range of benefits.
  • Bitcoin can be a store of value and an investment.
  • Investing in cryptocurrencies like bitcoin has become increasingly popular, but it involves risks and is not for everyone.

You can't go very far these days without hearing about cryptocurrencies. Rappers rap about them. Celebs tweet about them. Prominent CEOs opine about 通貨オプション入門 通貨オプション入門 them. And this year for the first time the IRS is asking us on its tax Form 1040 if we invested in them.

But just because crypto seems to be everywhere doesn't mean it is easy to understand, or that it is right for you. Here's a laymen's guide to help you better understand the ins and outs of the most familiar of cryptos—bitcoin.

Get more Viewpoints. Sign up for the Fidelity Viewpoints® weekly email for our latest insights. Subscribe now.

What is 通貨オプション入門 通貨オプション入門 bitcoin?

Bitcoin, also known as BTC, is the world's first and largest decentralized digital money. Decentralized means it's not backed, controlled, or owned by any government, central bank, corporation, or other institution. Instead, 通貨オプション入門 Bitcoin is managed by computer software that anyone with access to the internet can download and use to monitor and verify transactions. Compare that with a dollar, for example, which is backed by the US government and regulated by the US Federal Reserve.

Bitcoin is the network of connected computers where the digital token (also known as bitcoin) lives. The currency is digital only, meaning it cannot be removed from its digital network and therefore does not exist in a physical form like paper money. You cannot place a physical bitcoin in your wallet, even if you buy it at a bitcoin ATM (通貨オプション入門 yes, those exist).

In addition to being a digital currency that can be used to make transactions, bitcoin can also be used as a store of value and as an investment. While there are 通貨オプション入門 thousands of cryptocurrencies, bitcoin is the most widely held and traded.

How does bitcoin work?

The technology powering bitcoin—and all other cryptocurrencies—is called blockchain. Think of blockchain as a gigantic digital database (referred to as the ledger) that stores details of every single bitcoin transaction and distributes them across the internet to computers that are running the Bitcoin software. Every cryptocurrency uses its own specific blockchain. The computers running 通貨オプション入門 the software batch transactions together in groups, called "blocks," which are then added to the database or ledger in chronological order, forming a chain using cryptographic functions—hence the terms "blockchain" and "cryptocurrency." The total number of computers running the Bitcoin software (called nodes) is in the tens of thousands.

What is bitcoin mining and how does it work?

Bitcoin mining is the process through which new transactions on the bitcoin blockchain are verified.

Bitcoin miners compete with one another to solve cryptographic puzzles to verify any transactions involving bitcoin. Consequently, transactions take 10 to 60 minutes on average, and this can vary depending 通貨オプション入門 on how much you want to pay in fees and how sure you want to be that the transaction is fully confirmed. While this is significantly faster than electronic fund transfers, which can take days to process, it's not nearly as fast as credit card transactions, which can take just a few seconds.

Bitcoin mining releases new bitcoin into circulation as a reward to miners who have dedicated computing power and electricity to help secure the Bitcoin network by verifying transactions. New bitcoin are also released according to a schedule that was already preprogrammed into its code when it was created.

Who 通貨オプション入門 created Bitcoin?

In 2008, a person or team referred to as Satoshi Nakamoto published a paper outlining the principles governing Bitcoin technology. Then, in 2009, BTC itself was launched. To this day, no one really 通貨オプション入門 knows who Satoshi Nakamoto is.

How many bitcoin are there?

According to Bitcoin's current code, there cannot be more than 21 million bitcoin in existence. It is highly unlikely this cap will be changed due to Bitcoin's software code and how the rules are maintained. Of the 21 million that might eventually exist, there are currently a little over 19 million bitcoin already released, and the rate 通貨オプション入門 at which new bitcoin are released gets cut in half approximately every 4 years.

In addition, bitcoin is readily divisible, which allows you to buy small pieces of the cryptocurrency. The smallest unit of bitcoin is called a Satoshi or "sat" for short. There are 100 million sats per bitcoin, making bitcoin divisible to 8 decimal places—more than most traditional currencies. So, if the price of a whole 通貨オプション入門 bitcoin were $1 million, each sat would be equivalent to one cent.

What is bitcoin's price, and how is it determined?

BTC's price was around $29,000 as of mid-May 2022.

Graphic charts the price of bitcoin over the past 5 years, illustrating its volatility.

The 通貨オプション入門 通貨オプション入門 price of bitcoin is determined by the supply and demand, much like the price of shares of stocks or other currencies. Factors that can influence the supply and demand of bitcoin include the acceptance 通貨オプション入門 of bitcoin by companies and individuals, investor sentiment, central bank monetary policy, inflation, and foreign currency exchange rates.

How to use bitcoin

With bitcoin, people can send each other money directly over the internet without involving 通貨オプション入門 a third party like a bank or credit card company. This is known as a "peer-to-peer" transaction.

Similar to how some other digital wallet providers like Venmo, PayPal, Cash App, or Zelle enable electronic 通貨オプション入門 transfers with traditional currencies, bitcoin transfers can be made online or through a smartphone app on the Bitcoin network. Unlike those other digital wallet providers, Bitcoin is an open system, which can be accessed and used by anyone in the world.

You can also buy bitcoin as an investment. Bitcoin's price has risen from $0.09 at its founding in 2009 to roughly $29,000 as of mid-May 2022—with huge price swings occurring on a frequent basis (see graph). Investors need to be sure they can stomach that kind of volatility and risk of loss.

What is a bitcoin wallet?

A bitcoin wallet is essentially an electronic vault where you can hold bitcoin. Just like your bank or investment account has a routing number, your bitcoin wallet will have a public address. It consists of seemingly random letters and numbers that aren't necessarily linked to names, home or business addresses, or other personally identifying information.

You will need your public address, along with password-like codes called public and private keys, to send, receive, and access your bitcoin.

Bitcoin fees

In most cases, those who purchase, sell, or transfer bitcoin will be charged transaction fees by the platforms where they hold their cryptocurrency. Transaction costs can vary widely, ranging from 0.5% to 4%, depending on the funding method used.

Every bitcoin transaction also has a so-called network fee. This is automatically deducted from the bitcoin sent, and the amount of 通貨オプション入門 the fee varies based on a variety of factors. Transaction fees on the core Bitcoin network fluctuate, depending on how congested the network is.

Bitcoin taxes

Sales or other dispositions of bitcoin (and other cryptocurrencies) are generally taxable events. Taxes on cryptocurrencies are similar in many respects to those of other capital assets like stocks and bonds—with short- and long-term holding period tax rules applying. But beware that complexity can exist with crypto taxes, such as if you are actively trading and making many crypto trades. Consider consulting a tax professional if you have crypto tax questions.

Risks of investing in bitcoin

Some people have 通貨オプション入門 been drawn to bitcoin trading as a way to make a quick profit. However, as is the case with most speculative investments, you need to be careful. Buying, selling, and using bitcoin carry numerous risks, including:

  • The price of bitcoin and other digital currencies has fluctuated unpredictably and drastically. You could experience significant and rapid losses as well as gains.
  • Digital currency such as bitcoin is not 通貨オプション入門 通貨オプション入門 legal tender. No law requires companies or individuals to accept bitcoin as a form of payment. Instead, bitcoin use is limited to businesses and individuals that are willing to accept bitcoin. Additionally, regulation of cryptocurrencies could change at any time, potentially altering each cryptocurrency's investing outlook.
  • Platforms that buy and sell bitcoin may be unregulated, can be hacked, may stop operating, and some have failed. In addition, 通貨オプション入門 like the platforms themselves, digital wallets can be hacked. As a result, consumers can—and have—lost money.
  • Bitcoin transactions can be subject to fraud and theft. For example, a fraudster could pose as a bitcoin exchange, bitcoin intermediary, or trader in an effort to lure you to send money, which is then stolen.
  • Bitcoin keys can be permanently lost if you forget the information you need to access 通貨オプション入門 them.
  • Unlike banking institutions that can provide FDIC insurance, there are not similar safeguards provided to digital wallets.
  • Bitcoin payments are designed to be irreversible. Once you complete a transaction, you cannot 通貨オプション入門 reverse it. Reversing a transaction depends solely on the willingness of the recipient to send back your bitcoin.

When researching and evaluating any investment, it's important to determine whether it fits with your 通貨オプション入門 time horizon, financial circumstances, tolerance for volatility, and risk of loss. If you're thinking of investing in bitcoin or related opportunities, take the time to get educated about digital assets, be prepared for significant price gyrations, and proceed with caution.

What is bitcoin?

Learn how the largest cryptocurrency works, along with the key risks to understand.

  • Fidelity Active Investor
  • – 05/18/2022
  • 1000

Key takeaways

  • Digital currencies like 通貨オプション入門 bitcoin are different from traditional payment methods.
  • Bitcoin, which is the first and largest cryptocurrency, and its underlying blockchain technology have a range of benefits.
  • Bitcoin can be a store of value and an investment.
  • Investing in cryptocurrencies like bitcoin has become increasingly popular, but it involves risks and is not for everyone.

You can't go very far these days without hearing about cryptocurrencies. Rappers 通貨オプション入門 通貨オプション入門 rap about them. Celebs tweet about them. Prominent CEOs opine about them. And this year for the first time the IRS is asking us on its tax Form 1040 if we invested in them.

But just because crypto seems to be everywhere doesn't mean it is easy to understand, or that it is right for you. Here's a laymen's guide to help you better understand the 通貨オプション入門 ins and outs of the most familiar of cryptos—bitcoin.

Get more Viewpoints. Sign up for the Fidelity Viewpoints® weekly email for our latest insights. Subscribe now.

What is bitcoin?

Bitcoin, also known as BTC, is the world's first and largest decentralized digital money. Decentralized means it's not backed, controlled, 通貨オプション入門 通貨オプション入門 通貨オプション入門 or owned by any government, central bank, corporation, or other institution. Instead, Bitcoin is managed by computer software that anyone with access to the internet can download and use to monitor and verify transactions. Compare 通貨オプション入門 that with a dollar, for example, which is backed by the US government and regulated by the US Federal Reserve.

Bitcoin is the network of connected computers where the digital token (also known as bitcoin) lives. The currency is digital only, meaning it cannot be removed from its digital network and therefore does not exist in a physical form like paper money. You cannot place a physical bitcoin 通貨オプション入門 in your wallet, even if you buy it at a bitcoin ATM (yes, those exist).

In addition to being a digital currency that can be used to make transactions, bitcoin can also be used as 通貨オプション入門 a store of value and as an investment. While there are thousands of cryptocurrencies, bitcoin is the most widely held and traded.

How does bitcoin work?

The technology powering bitcoin—and all other cryptocurrencies—is called 通貨オプション入門 通貨オプション入門 blockchain. Think of blockchain as a gigantic digital database (referred to as the ledger) that stores details of every single bitcoin transaction and distributes them across the internet to computers that are running the Bitcoin 通貨オプション入門 software. Every cryptocurrency uses its own specific blockchain. The computers running the software batch transactions together in groups, called "blocks," which are then added to the database or ledger in chronological order, forming a 通貨オプション入門 chain using cryptographic functions—hence the terms "blockchain" and "cryptocurrency." The total number of computers running the Bitcoin software (called nodes) is in the tens of thousands.

What is bitcoin mining and how does it work?通貨オプション入門

Bitcoin mining is the process through which new transactions on the bitcoin blockchain are verified.

Bitcoin miners compete with one another to solve cryptographic puzzles to verify any transactions involving bitcoin. Consequently, transactions take 通貨オプション入門 10 to 60 minutes on average, and this can vary depending on how much you want to pay in fees and how sure you want to be that the transaction is fully confirmed. While this is significantly faster than electronic fund transfers, which can take days to process, it's not nearly as fast as credit card transactions, which can take just a few seconds.

Bitcoin mining releases new 通貨オプション入門 bitcoin into circulation as a reward to miners who have dedicated computing power and electricity to help secure the Bitcoin network by verifying transactions. New bitcoin are also released according to a schedule that 通貨オプション入門 was already preprogrammed into its code when it was created.

Who created Bitcoin?

In 2008, a person or team referred to as Satoshi Nakamoto published a paper outlining the principles governing Bitcoin technology. Then, in 2009, BTC itself was launched. To this day, no one really knows who Satoshi Nakamoto is.

How many bitcoin are there?

According to Bitcoin's current code, there cannot be more than 21 million bitcoin in existence. It is highly unlikely this cap will be changed due to Bitcoin's software code and how the rules are maintained. Of the 21 million that might eventually exist, there are currently a little over 19 million bitcoin already released, and the rate at which new bitcoin are released gets cut in half approximately every 4 years.

In addition, bitcoin is readily divisible, which allows you to buy small pieces of the cryptocurrency. The smallest unit of bitcoin is called a Satoshi or "sat" for short. There are 100 million sats per bitcoin, making bitcoin divisible to 8 decimal places—more 通貨オプション入門 通貨オプション入門 通貨オプション入門 than most traditional currencies. So, if the price of a whole bitcoin were $1 million, each sat would be equivalent to one cent.

What is bitcoin's price, and how is it determined?

BTC's 通貨オプション入門 通貨オプション入門 price was around $29,000 as of mid-May 2022.

Graphic charts the price of bitcoin over the past 5 years, illustrating its volatility.

The price of bitcoin is determined by the supply and demand, much like the price of shares of stocks or other currencies. Factors that 通貨オプション入門 通貨オプション入門 can influence the supply and demand of bitcoin include the acceptance of bitcoin by companies and individuals, investor sentiment, central bank monetary policy, inflation, and foreign currency exchange rates.

How to use bitcoin

With bitcoin, people can send each other money directly over the internet without involving a third party like a bank or credit card company. This is known as a "peer-to-peer" transaction.

Similar to how some other digital 通貨オプション入門 通貨オプション入門 wallet providers like Venmo, PayPal, Cash App, or Zelle enable electronic transfers with traditional currencies, bitcoin transfers can be made online or through a smartphone app on the Bitcoin network. Unlike those other digital wallet providers, Bitcoin is an open system, which can be accessed and used by anyone in the world.

You can also buy bitcoin as an investment. Bitcoin's price has risen from $0.09 at 通貨オプション入門 its founding in 2009 to roughly $29,000 as of mid-May 2022—with huge price swings occurring on a frequent basis (see graph). Investors need to be sure they can stomach that kind of volatility and risk of loss.

What is a bitcoin wallet?

A bitcoin wallet is essentially an electronic vault where you can hold bitcoin. Just like your bank or investment account has a routing number, your 通貨オプション入門 bitcoin wallet will have a public address. It consists of seemingly random letters and numbers that aren't necessarily linked to names, home or business addresses, or other personally identifying information.

You will need your 通貨オプション入門 public address, along with password-like codes called public and private keys, to send, receive, and access your bitcoin.

Bitcoin fees

In most cases, those who purchase, sell, or transfer bitcoin will be charged transaction fees 通貨オプション入門 by the platforms where they hold their cryptocurrency. Transaction costs can vary widely, ranging from 0.5% to 4%, depending on the funding method used.

Every bitcoin transaction also has a so-called network fee. This 通貨オプション入門 is automatically deducted from the bitcoin sent, and the amount of the fee varies based on a variety of factors. Transaction fees on the core Bitcoin network fluctuate, depending on how congested the network 通貨オプション入門 is.

Bitcoin taxes

Sales or other dispositions of bitcoin (and other cryptocurrencies) are generally taxable events. Taxes on cryptocurrencies are similar in many respects to those of other capital assets like stocks and bonds—with short- and 通貨オプション入門 long-term holding period tax rules applying. But beware that complexity can exist with crypto taxes, such as if you are actively trading and making many crypto trades. Consider consulting a tax professional if you 通貨オプション入門 通貨オプション入門 have crypto tax questions.

Risks of investing in bitcoin

Some people have been drawn to bitcoin trading as a way to make a quick profit. However, as is the case with most speculative investments, you 通貨オプション入門 need to be careful. Buying, selling, and using bitcoin carry numerous risks, including:

  • The price of bitcoin and other digital currencies has fluctuated unpredictably and drastically. You could experience significant and rapid losses as 通貨オプション入門 well as gains.
  • Digital currency such as bitcoin is not legal tender. No law requires companies or individuals to accept bitcoin as a form of payment. Instead, bitcoin use is limited to businesses and individuals that are willing to accept bitcoin. Additionally, regulation of cryptocurrencies could change at any time, potentially altering each cryptocurrency's investing outlook.
  • Platforms that buy and sell bitcoin may be unregulated, can be hacked, may stop operating, and some have failed. In addition, like the platforms themselves, digital wallets can be hacked. As a result, consumers can—and have—lost money.
  • Bitcoin transactions can be subject to 通貨オプション入門 fraud and theft. For example, a fraudster could pose as a bitcoin exchange, bitcoin intermediary, or trader in an effort to lure you to send money, which is then stolen.
  • Bitcoin keys can 通貨オプション入門 be permanently lost if you forget the information you need to access them.
  • Unlike banking institutions that can provide FDIC insurance, there are not similar safeguards provided to digital wallets.
  • Bitcoin payments are designed to be irreversible. Once you complete a transaction, you cannot reverse it. Reversing a transaction depends solely on the willingness of the recipient to send back your bitcoin.

When researching and evaluating any investment, it's important to determine whether it fits with your time horizon, financial circumstances, tolerance for volatility, and risk of loss. If you're thinking of investing in bitcoin or related opportunities, take the time to get educated about digital assets, be prepared for significant price gyrations, and proceed with caution.

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[人気株500激辛診断/米国株150]

◎巻頭特集

2022年後半の日本株&為替大予測

●日本株:秋に底入れ年末3万円へ
●為替:1ドル130円の時代に突入

◎第1特集
10万円未満で買える株は111銘柄!
人気の株500+Jリート14激辛診断

●2022年夏のイチオシ株
・10万円株/高配当株/株主優待株/Jリート
●気になる人気株
・大型株/新興株/Jリート
●儲かる株の見つけ方
旬の3大テーマ円安メリット株」「株主還元強化株」「会社予想が保守的な株
5大ランキング今期最新予想が大幅増収」「アナリストが強気
高配当利回り株」「少額で買える株
●投資判断に異変アリ!
日本通運、住友不動産が「買い」に格上げ 通貨オプション入門
東急、新生銀行、シャープが「弱気」に転落

◎第2特集
高利回り&割安株を狙え
波乱相場ならではの狙い目株が続々!
人気株500以外からセレクトした「買いの株100」

●桐谷さんオススメ株主優待株
●増配かつ高配当な株
●初心者オススメ5万円株
●上方修正に期待大の株
●波乱に負けない高成長株

◎第3特集
人気の米国株150診断

●どうなる米国株?
「インフレなどで波乱は続くが10月末から上昇へ転じる!」
●注目銘柄
「有力定番IT株」「高配当割安株」「ディフェンシブ株」
●定点観測
GAFAM+αテスラ、エヌビディア、ネットフリックスなど

伝説のスゴ腕投資家バフェット が10年ぶりに株をオトナ買い
バフェットはいまの米国株をこう見てる&バフェットが買った銘柄をチェック!


◎人気連載もお楽しみに!
●10倍株を探せ! IPO株研究所
●自腹でガチンコ投資!AKB48ガチ株バトル
●AKB48武藤十夢のわくわくFX生活!
●株入門マンガ恋する株式相場!
●どこから来てどこへ行くのか日本国
●人気毎月分配型100本の「分配金」

【マンガでわかる!お金超入門】暗号資産(仮想通貨)はやっておくべき?初心者向けに超基礎知識を解説!

「お金のことをもっと勉強しなきゃ」「お金の使い方を見直したい」と思いながら、何から手をつければよいかわからない――。そんな“お金超初心者”に、ファイナンシャルプランナーの坂本綾子さんが “お金の基本のキ”を教える連載がスタート。アベナオミさんのマンガとともに、これからの時代に知っておきたい「お金の知識」をわかりやすく楽しくガイドします! 【マンガ】私のヘソクリ計画 ■大儲けも大損もあり?暗号資産ってそもそもどんなもの? 短い期間でお金を何倍にも増やしたい、投資にそんな期待を持つ人ほど暗号資産に興味があるようです。実際、代表的な暗号資産であるビットコインが一時期大きく値上がりしました。しかし、その分、値下がりするときの下げ幅も大きく、価格変動の激しさは半端ではありません。大儲けできるかもしれないけど、大損するリスクも大きいのが暗号資産です。そもそも暗号資産とは、どんな仕組みのどんな資産なのでしょうか? 暗号資産は、一言で言えばインターネット上で取引ができる資産です。最初の暗号資産はビットコインで2009年に運用が始まり、コンピュータを使ったマイニング(採掘)によりその量は増加しています。インターネットに国境がないように、インターネット上の資産である暗号資産にも国境がありません。暗号資産は国を超えた送金が早くて便利なことから利用する人が増えました。 国の信用などの裏付けはないものの、改ざんされにくいブロックチェーン(分散型台帳)技術で管理されているので、暗号資産そのものの安全性は高いと言われています。人気が出て、円などの法定通貨と暗号資産を交換するときのレートが上がり、暗号資産は値上がりしたのです。イーサリアムなど新たな暗号資産も登場し、現在は数千もの暗号資産が世界中でやり取りされています。円に換算した価値の総額は数十兆円にもなるようです。 ■「仮想通貨」から「暗号資産」に呼び方が変わった理由とは? 暗号資産は、以前は仮想通貨と呼ばれていました。今でも仮想通貨と呼ぶ人もいますよね。どうして呼び方が変わったかというと、「通貨」という単語が誤解を招きやすいのが理由のようです。国の通貨、いわゆるお金は、中央銀行である日本銀行が発行し、国の信用が裏付けにあるので、国民は安心して使っています。これに対して暗号資産の運用には国は関わっていません。インターネット上の電子データなので現物も存在しません。海外での呼び方も参考に、2020年に法律上の呼び方が暗号資産に変更されました。 つまり暗号資産は、「お金としては認められていないが、お金と交換ができ、インターネット上でやりとりができる資産」です。 当初はごく一部の人のみが使っていましたが、個人も暗号資産の取引をするようになったことや、暗号資産を管理する取引所から暗号資産が不正に盗まれる事件が相次いだこと、暗号資産への投資を誘う詐欺も起きていることから、日本では2017年以降、法律で規制されています。 暗号資産に興味があり、持ってみたいのであれば、金融庁に登録された「暗号資産交換業者」を通すことです。円を暗号資産に交換する、暗号資産を別の暗号資産に交換する、暗号資産を円に交換することができます。業者を選ぶ際には、手数料や、暗号資産の保管方法、セキュリティ対策を確認しましょう。ただし、手に入れた暗号資産が値上がりするかどうかはわかりません。証拠金取引(預けたお金の何倍かの取引ができる)も可能ですが、さらにリスクが高くなります。 ■10年後には普通に使われているかも?暗号資産の今後 代表的な投資である株式は、株式会社が実際に商品やサービスを提供し、その売上が利益として会社に入り、そこから投資家に配当金が支払われます。また、その会社の株式を欲しい人が増えて株価が上がったりします。 暗号資産の値上がりは、実際の経済活動ではなく、値上がりへの期待から起きているといえます。逆に、期待が不安や失望に変われば売られて値下がりします。余裕資金で少し持ってみるのは自由ですが、一獲千金を夢見て多額のお金を投資するのはリスクが高いと言えるでしょう。ちなみに、暗号資産の取引で利益がでたときは、雑所得として税金がかかります。 では一般人は暗号資産とは無関係でいいのでしょうか?自分で暗号資産を持たないにしても、今後の動向には注目しておいた方がいいでしょう。暗号資産はインターネット時代だからこその資産です。インターネットも当初はごく一部の人が利用するのみでしたが、今では多くの人が日常的に使い、社会に欠かせないものになっています。暗号資産の技術は様々な場面で利用することが期待され、実際に取り組みが始まっています。今後どのような方向に進んでいくかは未知数ですが、もしかすると、10年後には普通に使われているかもしれません。 【著者 プロフィール】 坂本綾子/ファイナンシャルプランナー坂本綾子事務所代表。 20年を超える取材記者経験を生かして、生活者向けの金融・経済記事の執筆、家計相談、セミナーを行っている。 著書に「年収200万円の私でも心おだやかに毎日暮らせるお金の貯め方を教えてください!」(SBクリエイティブ)など。 【イラストレーター プロフィール】 アベナオミ/宮城県生まれ、宮城県在住。地元情報誌のデザイナーをしながらイラストレーターとしても活動。2016年にフリーランスに。著書に「マンガでわかる!妊娠・出産はじめてBOOK」(KADOKAWA)など。

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