<p>pafin Inc., the operator of cryptact, crypto tax software with more than 300,000 users, has joined the Digital Economy Council of Australia (DECA) as a business member. As a member, pafin will share its experience in crypto tax calculation with Australia’s digital economy community.<br>&nbsp;</p><p>For more details, please visit the <a target="_blank" rel="noopener noreferrer" href="https://www.cryptact.com/en/news/pr-deca-membership-en">cryptact News Page</a>.</p>

Launched in Australia in July, cryptact will work with local experts to help crypto investors lodge accurate tax returns.

Joins the Digital Economy Council of Australia

プレスリリース

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オーストラリアのデジタル経済業界団体「DECA」に入会

pafin

ニュース

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jimin-comittee-2026

出席のお知らせ（自由民主党『予算・税制等に関する政策懇談会』 【金融・証券関係】）

<h3>Showcasing what cross-functional teams built at pafin Hackathon through AI-driven development</h3><p>pafin Inc., the company behind cryptact, a crypto tax platform with more than 200,000 users in Japan, today launched a <a target="_blank" rel="noopener noreferrer" href="https://www.pafin.com/en/hackathon">dedicated page</a> on its website for its internal hackathon, pafin Hackathon. Two projects from pafin Hackathon 2026 have already launched: fakestream, an open-source emulator for developers, and Sumazou, a service that sends medical scan images straight to patients' smartphones and went on sale on Oct. 1.</p><p>pafin first held the hackathon in 2024. The second edition, pafin Hackathon 2026, took place in June with the goal of putting AI tools to work across the whole company. Teams had just a few days to take an idea from plan to working prototype. The page introduces each edition of the hackathon, the teams behind it and the projects they built.</p><p>&nbsp;</p><h3>What sets pafin Hackathon apart</h3><h4>Mixed teams, open briefs</h4><p>Each team mixed engineers with colleagues from business development, marketing, customer success, HR and design. Each team picked its own project, with no requirement to tie it to pafin's existing products.</p><p>&nbsp;</p><h4>24 participants, 11 nationalities</h4><p>The participants are from Japan, Morocco, France, Belgium, India, Nepal, China, South Korea, New Zealand, Canada and the United States.</p><p>&nbsp;</p><h4>Beyond the prototype</h4><p>In addition to the projects released publicly, some hackathon projects are now part of how pafin works every day. Two internal tools from the first edition in 2024 are still in use today: pafin TV, which shows daily sales and other figures on the office TV, and bottin, a directory that gathers pafin’s internal tools in one place.</p><p>&nbsp;</p><h3>Why pafin runs a hackathon</h3><p>“AI is changing the way we work, and we have to keep up,” said Amin Azmoudeh, Co-CEO of pafin. “We run this hackathon for three reasons. We want everyone at pafin to be fluent with AI tools. We want to close the gap in how different teams use AI. And we want to find the next products and businesses worth building.</p><p>“When people build something side by side with colleagues who know the tools well, it changes how they work every day. That sharpens our creativity and problem-solving, and it’s what keeps us building services our users actually find useful.”</p><p>&nbsp;</p><h3>Projects from pafin Hackathon</h3><h4>fakestream (2026 hackathon · open source)</h4><p>fakestream is a small local emulator for Amazon Kinesis Data Streams, AWS's data streaming service, that runs on a developer's machine or in a CI job. Written in Rust, it was built to solve a problem in pafin's own development environment. pafin released it on Sept. 7, 2026, as open source under the MIT license, which allows commercial use and modification.</p><p>GitHub: <a target="_blank" rel="noopener noreferrer" href="https://github.com/pafin-inc/fakestream">https://github.com/pafin-inc/fakestream</a></p><p>&nbsp;</p><h4>Sumazou (2026 hackathon · on sale)</h4><p>Sumazou works with diagnostic images, such as CT and MRI scans, that hospitals give patients on a CD or DVD. From a dedicated kiosk installed in the hospital, it sends those images directly to the patient's own smartphone. The patient inserts the disc into the kiosk and scans a QR code with the free Sumazou app, and the whole transfer happens right there in the hospital. pafin began selling the service on Oct. 1, 2026, and announced that Kanto Neurosurgical Hospital has adopted it.</p><p>Website (Japanese): <a target="_blank" rel="noopener noreferrer" href="https://sumazou.com/">https://sumazou.com/</a></p><p>&nbsp;</p><h4>Crypto Tax Simulator (2024 hackathon · free tool)</h4><p>This free tool estimates how much tax users would owe on crypto gains under Japanese tax rules, based on their annual income and crypto profits. It also works for sole proprietors. Released on Dec. 2, 2024, it passed 70,000 users in July 2025.</p><p>Tool (Japanese): <a target="_blank" rel="noopener noreferrer" href="https://www.cryptact.com/crypto-tax-simulator">https://www.cryptact.com/crypto-tax-simulator</a></p><p>&nbsp;</p><h4>Other projects presented at the hackathon</h4><ul><li><strong>Cryptrack: </strong>a single feed for crypto regulation, exchange and coin news</li><li><strong>Emojact: </strong>a tool that finds custom Slack emoji by meaning</li><li><strong>necho: </strong>a social network where people hang out and do nothing in particular with AI companions that take the form of cats, rocks and clouds</li></ul><div class="d-flex align-items-center justify-content-center m-4 text-center" data-variation="pafin"><div class="gradient-btn"><div class="div-btn"><div class="inner-div-btn button-lg"><a target="_blank" rel="noopener noreferrer" href="https://www.pafin.com/en/hackathon"><span style="color:hsl(0,0%,100%);"><span>Visit the hackathon page</span></span></a></div></div></div></div><p>&nbsp;</p><h3>About pafin Inc.</h3><h4>Services</h4><p><strong>cryptact: automated crypto tax calculation</strong><br>With more than 200,000 users in Japan, cryptact is one of the country's largest crypto tax calculation platforms. It provides automated profit-and-loss calculation and portfolio management to help users prepare their tax returns.<br>Website: <a target="_blank" rel="noopener noreferrer" href="https://www.cryptact.com/en">https://www.cryptact.com/en</a><br>X: <a target="_blank" rel="noopener noreferrer" href="https://x.com/CryptactGlobal">https://x.com/CryptactGlobal</a></p><p>&nbsp;</p><p><strong>Guardian: crypto tax filing support</strong><br>Crypto-savvy tax accountants and a dedicated calculation team handle everything from profit-and-loss calculation to filing the tax return.<br>Website: <a target="_blank" rel="noopener noreferrer" href="https://guardian.pafin.com/">https://guardian.pafin.com/</a></p><p>&nbsp;</p><p><strong>defitact: a portfolio tracker for Web3</strong><br>Enter a wallet address and defitact instantly pulls together your on-chain transactions and visualizes your portfolio. It shows activity across multiple decentralized applications, along with real-time balances and the market value of the assets in your wallet.<br>Website: <a target="_blank" rel="noopener noreferrer" href="https://www.defitact.com/">https://www.defitact.com/</a></p><p>&nbsp;</p><h4>Company Profile</h4><p><strong>Company Name:</strong> pafin Inc.<br><strong>Location:</strong> Frontier Kojimachi 5F, Kojimachi 3-2-4, Chiyoda City, Tokyo, Japan 102-0083<br><strong>Representative Directors:</strong> Amin Azmoudeh, Co-CEO / Gaku Saito, Co-CEO<br><strong>Date Founded:</strong> January 2018<br><strong>Website:</strong> <a target="_blank" rel="noopener noreferrer" href="https://www.pafin.com/">https://www.pafin.com/</a><br><strong>YouTube:</strong> <a target="_blank" rel="noopener noreferrer" href="https://www.youtube.com/@pafin">https://www.youtube.com/@pafin</a></p><p>&nbsp;</p><p><strong>Media Contact</strong><br>pafin Inc. Public Relations<br>Email: <a href="mailto:pr@pafin.com">pr@pafin.com</a></p>

pafin launched a dedicated page for its internal pafin Hackathon.

pafin Launches Page for Its Internal Hackathon That Produced an Open-Source Infrastructure Tool and a Medical Image Transfer Service

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ITインフラOSSと検査画像スマートフォン転送サービスが誕生した社内ハッカソン特設ページを公開

スマぞう「第24回 日本臨床医療福祉学会」出展のお知らせ

株式会社エッサム「『すぐに使える！』暗号資産の所得計算 完全実務セミナー」10/14登壇のお知らせ

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病院のCT・MRI画像を受診者のスマートフォンへ。院内LAN・PACSに接続しない検査画像転送サービス「スマぞう」販売開始

メディア掲載

Yahoo!ファイナンスに当社執筆の暗号資産税制に関する記事が掲載されました。

<h3>Written in Rust, released under the MIT license. Built at pafin Hackathon 2026, our second in-house hackathon.</h3><p style="margin-bottom:1.2em;">pafin Inc., the company behind cryptact, a crypto tax platform with more than 200,000 users in Japan, has released fakestream as open source under the MIT license, which allows commercial use and modification. fakestream emulates Amazon Kinesis Data Streams on a developer's machine or in a CI job. It is the first project to come out of pafin Hackathon 2026, the in-house hackathon we held to accelerate AI adoption across the company.</p><h3><strong>Background</strong></h3><p style="margin-bottom:1.2em;">We have used Kinesis for about eight years. It moves transaction data between our services: the crawlers that fetch trades from exchanges and blockchains, the translation layer that normalizes them, and the ledger engine that computes gains and losses.</p><p style="margin-bottom:1.2em;">Reproducing that pipeline on a developer's machine and in CI, however, had been a problem for a long time. We ran LocalStack, with its JVM-based engine enabled to get the throughput we needed. Even with several gigabytes of heap it ran out of memory on large wallets, and every restart of the stack waited on the JVM to start. In CI, one instance per test job limited how many jobs fit on a runner. As DeFi grew and our data volume grew with it, that cost rose year after year.</p><p style="margin-bottom:1.2em;">In March 2026 LocalStack ended its Community edition. The remaining free tier requires an account and an auth token and is limited to non-commercial use. That change was what pushed us to solve a problem we had been working around.</p><p>&nbsp;</p><h3><strong>Why we built it</strong></h3><p style="margin-bottom:1.2em;">After looking at the existing alternatives, we measured what we actually call. It came to ten Kinesis operations: managing streams and shards, and reading and writing records. With a surface that small, we decided to use the hackathon week to write our own server in Rust, with no runtime like the JVM underneath it, and to see whether it could replace Kinesis in our development environment.</p><p style="margin-bottom:1.2em;">The replacement was finished during the hackathon, and fakestream now runs in our local development stacks every day.</p><p>&nbsp;</p><h3><strong>Results</strong></h3><p style="margin-bottom:1.2em;">Idle memory is about 2 MB, down from the multi-gigabyte heap the previous setup needed. Startup takes milliseconds, and the out-of-memory failures on large wallets are gone. In CI, each test job costs less, so a single runner fits more jobs in parallel.</p><p style="margin-bottom:1.2em;">On performance: on a developer laptop, replaying our own ingestion traffic at about twelve times its peak rate, fakestream sustained 171 MB/s of writes and 227 MB/s of reads. It had headroom left at that point; the load generator was the limit.</p><p>&nbsp;</p><h3><strong>Scope and caveats</strong></h3><p style="margin-bottom:1.2em;">fakestream runs as a single binary, and using it is a matter of pointing your AWS SDK's Kinesis endpoint at it. SQS, DynamoDB, S3 and the rest of your setup stay as they are.</p><p style="margin-bottom:1.2em;">It is a development and CI tool. It has no authentication, so it should run on trusted networks only: localhost, a CI job or a private container network. It is not a replacement for Kinesis in production.</p><p style="margin-bottom:1.2em;">Technical details — the operations it supports, the Kinesis limits it enforces, the persistence option and the full benchmarks — are published on the project site.</p><p>&nbsp;</p><h3><strong>Getting started</strong></h3><div style="border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,0.35);font-family:'SF Mono','Menlo','Consolas','Liberation Mono',monospace;font-size:0.85em;margin:1em 0 1.5em;overflow:hidden;"><div style="background-color:#313244;color:#a6adc8;font-size:0.75em;letter-spacing:0.08em;padding:7px 20px;text-transform:uppercase;">Shell</div><div style="background-color:#1e1e2e;color:#cdd6f4;line-height:1.7;overflow-x:auto;padding:16px 20px;"><div><span style="color:#89b4fa;">docker</span> run <span style="color:#eba0ac;">--rm</span> <span style="color:#eba0ac;">-p</span> 4567:4567 ghcr.io/pafin-inc/fakestream</div></div></div><p style="margin-bottom:0.6em;">For full setup instructions, see the repository or the project site.</p><ul><li><p style="margin-left:24px;">Repository: <a target="_blank" rel="noopener noreferrer" href="https://github.com/pafin-inc/fakestream">https://github.com/pafin-inc/fakestream</a></p></li><li><p style="margin-left:24px;">Project site: <a target="_blank" rel="noopener noreferrer" href="https://fakestream.pafin.com/">https://fakestream.pafin.com/</a></p></li></ul><p style="margin-top:0.8em;">fakestream is released under the MIT license. It is free to use, including commercially, and requires no account and no auth token. It can also be modified and redistributed, with no restrictions on building it into your own development environment or CI.</p><p>&nbsp;</p><h3><strong>About pafin Hackathon 2026</strong></h3><p>pafin Hackathon 2026 was our second in-house hackathon. We are accelerating AI adoption across the company, and the hackathon brought engineers and business teams together to build a wide range of ideas with AI, from internal tooling improvements and new cryptact features to entirely new services.</p><p><img style="aspect-ratio:4080/3072;" src="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/1_d725745900.jpg" alt="The opening of pafin Hackathon 2026" srcset="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/thumbnail_1_d725745900.jpg 207w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/small_1_d725745900.jpg 500w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/medium_1_d725745900.jpg 750w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/large_1_d725745900.jpg 1000w," sizes="100vw" width="" height=""></p><p>&nbsp;</p><p><img style="aspect-ratio:3159/1778;" src="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/Kakao_Talk_20260629_100435147_28_2_83322eabac.jpg" alt="The fakestream team's presentation" srcset="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/thumbnail_Kakao_Talk_20260629_100435147_28_2_83322eabac.jpg 245w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/small_Kakao_Talk_20260629_100435147_28_2_83322eabac.jpg 500w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/medium_Kakao_Talk_20260629_100435147_28_2_83322eabac.jpg 750w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/large_Kakao_Talk_20260629_100435147_28_2_83322eabac.jpg 1000w," sizes="100vw" width="" height=""></p><p>&nbsp;</p><p><img style="aspect-ratio:4080/3072;" src="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/2_f3cf3aba66.jpg" alt="A product demo during the hackathon" srcset="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/thumbnail_2_f3cf3aba66.jpg 207w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/small_2_f3cf3aba66.jpg 500w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/medium_2_f3cf3aba66.jpg 750w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/large_2_f3cf3aba66.jpg 1000w," sizes="100vw" width="" height=""></p><p>&nbsp;</p><p><img style="aspect-ratio:4000/2252;" src="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/3_ebd45af3e1.jpg" alt="A team presenting its work" srcset="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/thumbnail_3_ebd45af3e1.jpg 245w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/small_3_ebd45af3e1.jpg 500w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/medium_3_ebd45af3e1.jpg 750w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/large_3_ebd45af3e1.jpg 1000w," sizes="100vw" width="" height=""></p><p>&nbsp;</p><p><img style="aspect-ratio:4000/2252;" src="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/4_021085fc80.jpg" alt="A presentation during the final demos" srcset="https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/thumbnail_4_021085fc80.jpg 245w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/small_4_021085fc80.jpg 500w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/medium_4_021085fc80.jpg 750w,https://pafin-cortex-production.s3.ap-northeast-1.amazonaws.com/large_4_021085fc80.jpg 1000w," sizes="100vw" width="" height=""></p><p>&nbsp;</p><div class="boilerplate" style="-webkit-text-stroke-width:0px;background-color:rgb(255, 255, 255);box-sizing:border-box;color:rgb(36, 53, 77);font-family:&quot;Plus Jakarta Sans&quot;, &quot;Plus Jakarta Sans Fallback&quot;, &quot;Plus Jakarta Sans&quot;, sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-weight:400;letter-spacing:normal;orphans:2;text-align:start;text-decoration-color:initial;text-decoration-style:initial;text-decoration-thickness:initial;text-indent:0px;text-transform:none;white-space:normal;widows:2;word-spacing:0px;"><h3 style="box-sizing:border-box;color:rgb(36, 53, 77);font-size:1.75rem;line-height:1.33;margin-bottom:20px;margin-top:0px;scroll-margin-top:130px;"><strong>About pafin Inc.</strong></h3><p style="box-sizing:border-box;line-height:1.6em;margin-bottom:20px;margin-top:0px;"><strong>Services</strong><br><strong>cryptact - Crypto tax calculations: Simplified -</strong><br>Automatically calculate capital gains, access all the information you need for tax filing, and efficiently manage your portfolio -- all in one place. Trusted by over 200,000 users.<br>Website: <a style="box-sizing:border-box;color:rgb(42, 109, 176);text-decoration:none;transition:color 0.1s ease-out;" target="_blank" rel="noopener noreferrer" href="https://www.cryptact.com/en">https://www.cryptact.com/en</a><br>X: <a style="box-sizing:border-box;color:rgb(42, 109, 176);text-decoration:none;transition:color 0.1s ease-out;" target="_blank" rel="noopener noreferrer" href="https://x.com/CryptactGlobal">https://x.com/CryptactGlobal</a></p><p style="margin-bottom:20px;"><strong>Guardian — Crypto Tax Filing Support</strong><br>A full-service solution where crypto-specialized tax professionals and dedicated P&amp;L specialists handle everything from gain/loss calculations to filing your tax return.<br>Website: <a target="_blank" rel="noopener noreferrer" href="https://crypto-city.net/guardian">https://crypto-city.net/guardian</a></p><p style="margin-bottom:20px;"><strong>defitact - Your Web3 Sidekick -</strong><br>defitact allows you visualize, analyze and manage your DeFi assets, NFTs and transactions through a highly intuitive and interactive interface. All features are for free.<br>Website: <a target="_blank" rel="noopener noreferrer" href="https://www.defitact.com/">https://www.defitact.com/</a></p><p style="box-sizing:border-box;line-height:1.6em;margin-bottom:20px;margin-top:0px;"><strong>Company Name:</strong> pafin Inc.<br><strong>Date Founded:</strong> January 2018<br><strong>Representative Directors:</strong> Amin Azmoudeh, Co-CEO / Gaku Saito, Co-CEO<br><strong>Location:</strong> Frontier Kojimachi 5F, Kojimachi 3-2-4, Chiyoda City, Tokyo, Japan 102-0083</p></div><div class="contact" style="-webkit-text-stroke-width:0px;background-color:rgb(255, 255, 255);box-sizing:border-box;color:rgb(36, 53, 77);font-family:&quot;Plus Jakarta Sans&quot;, &quot;Plus Jakarta Sans Fallback&quot;, &quot;Plus Jakarta Sans&quot;, sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-variant-ligatures:normal;font-weight:400;letter-spacing:normal;orphans:2;text-align:start;text-decoration-color:initial;text-decoration-style:initial;text-decoration-thickness:initial;text-indent:0px;text-transform:none;white-space:normal;widows:2;word-spacing:0px;"><p style="box-sizing:border-box;line-height:1.6em;margin-bottom:20px;margin-top:0px;"><strong>Media Contact</strong><br>Email: <a style="box-sizing:border-box;color:rgb(42, 109, 176);text-decoration:none;transition:color 0.1s ease-out;" href="mailto:pr@pafin.com">pr@pafin.com</a></p></div><p style="border-top:1px solid #E5E7EB;color:#6B7280;font-size:0.8em;line-height:1.6;margin-top:32px;padding-top:16px;">fakestream is not affiliated with Amazon Web Services, Inc. Amazon Kinesis is a trademark of Amazon.com, Inc.</p>

pafin has open sourced fakestream, a small local emulator for Amazon Kinesis Data Streams. Written in Rust, MIT licensed, built at our second hackathon.

pafin open sources fakestream, a small local emulator for Amazon Kinesis Data Streams

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Amazon Kinesis Data Streamsの軽量なローカルエミュレータ「fakestream」をOSS公開

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登壇のお知らせ 『OKJアカデミー OKJ×Metaplanet ～変化の激しい市場で挑戦を続ける理由～』9月15日

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登壇のお知らせ 『税金までしっかりわかる！JPYSCレンディングセミナー』8月19日

pafinからの最新ニュース

オーストラリアのデジタル経済業界団体「DECA」に入会

出席のお知らせ（自由民主党『予算・税制等に関する政策懇談会』【金融・証券関係】）

ITインフラOSSと検査画像スマートフォン転送サービスが誕生した社内ハッカソン特設ページを公開

スマぞう「第24回日本臨床医療福祉学会」出展のお知らせ

株式会社エッサム「『すぐに使える！』暗号資産の所得計算完全実務セミナー」10/14登壇のお知らせ

病院のCT・MRI画像を受診者のスマートフォンへ。院内LAN・PACSに接続しない検査画像転送サービス「スマぞう」販売開始

Yahoo!ファイナンスに当社執筆の暗号資産税制に関する記事が掲載されました。

Amazon Kinesis Data Streamsの軽量なローカルエミュレータ「fakestream」をOSS公開

登壇のお知らせ『OKJアカデミー OKJ×Metaplanet ～変化の激しい市場で挑戦を続ける理由～』9月15日

登壇のお知らせ『税金までしっかりわかる！JPYSCレンディングセミナー』8月19日

pafinからの最新ニュース

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