@o2k Reviews 

30
TrustScore 4.5 out of 5

4.7

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Rated 5 out of 5 stars

I completed both the Beginner and Intermediary bundles of the O2K Ultimate Guide to Taxation and Regulation of Crypto Assets, and I genuinely learned a lot. If you're looking for a crypto tax course t... See more

Rated 5 out of 5 stars

This was a very informative and well-structured course on crypto assets taxation. The content was explained in a clear and accessible way, making it suitable for both beginners and those with some pri... See more

Company replied

Rated 5 out of 5 stars

I completed a legal internship at O2K and had a very positive experience. The team was welcoming, professional, and always willing to support me throughout my internship. During my time there,... See more

Company replied

Company details

  1. Tax Lawyer
  2. Cryptocurrency Service
  3. Education Centre
  4. Lawyer
  5. Tax consultant
  6. Tax Preparation

Written by the company

@O2K is a tax and legal consulting firm established in 2020 in Amsterdam, specialized in crypto assets and their international taxation and regulation. We advise individuals, companies, institutions, and governments through one-on-one consulting and tailor-made training, covering crypto and traditional assets in cross-border contexts. Our services include international crypto tax and compliance, regulatory and legal advice, KYC & AML frameworks, company formation and structuring, crypto licensing in Europe, NFT valuation, and part-time Head of Tax / Legal roles. @O2K also developed the 10-lesson “Ultimate Guide to Taxation and Regulation of Crypto Assets”, the only course on the market addressing crypto from a fully international tax perspective.


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4.7

Excellent

TrustScore 4.5 out of 5

30 reviews

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4.7

All reviews

(30)

21 reviews in the last 12 months

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Rated 5 out of 5 stars

O2K courses

I completed both the Beginner and Intermediary O2K crypto tax courses and found them very insightful. The material is clear, structured, and a great resource for understanding crypto taxation.

1 March 2026
Unprompted review
Rated 5 out of 5 stars

This was a very informative and…

This was a very informative and well-structured course on crypto assets taxation. The content was explained in a clear and accessible way, making it suitable for both beginners and those with some prior knowledge. I would definitely recommend this course to anyone who wants to better understand the taxation of crypto assets.

28 February 2026
Unprompted review
@o2k logo

Reply from @o2k

thank you, Esra!

Rated 5 out of 5 stars

Highly Recommend the O2K Crypto Tax Courses

I completed both the Beginner and Intermediary bundles of the O2K Ultimate Guide to Taxation and Regulation of Crypto Assets, and I genuinely learned a lot. If you're looking for a crypto tax course that actually makes sense, this is it. You don't necessarily need prior knowledge of crypto assets, blockchain, or tax law to follow along, the content is incredibly digestible and builds up gradually. The courses cover everything from crypto asset classification to key taxable events in the crypto industry, making it a great resource for anyone interested in cryptocurrency taxation, crypto compliance, or crypto regulation. The content is peer-reviewed by real subject matter experts, and the quizzes do a great job of testing your knowledge along the way. Already looking forward to the upcoming courses in the series!

2 March 2026
Unprompted review
Rated 5 out of 5 stars

I completed a legal internship at O2K

I completed a legal internship at O2K and had a very positive experience. The team was welcoming, professional, and always willing to support me throughout my internship.

During my time there, I had the opportunity to gain practical insight into legal work and assist with various tasks that helped me develop my skills and understanding of the field.

A special thank you to Antonia Eilander for her guidance, kindness, and support during my internship. Her advice and encouragement made this experience even more valuable.

I would definitely recommend O2K to anyone looking for an opportunity to gain experience in crypto. Thank you to the whole team for this great opportunity.

9 March 2025
Unprompted review
@o2k logo

Reply from @o2k

Thank you for your kind words and thoughtful review. It was a pleasure having you at O2K.

You are an amazing professional and you have wonderful personality. We miss you.

Wishing you continued success in your legal career, and we hope our paths cross again in the future. 🚀

Rated 5 out of 5 stars

The team’s support is immerse

The team’s support is immerse. They would hold you by the hand and guide you all the way through. This made a huge difference for me.

16 December 2025
Unprompted review
@o2k logo

Reply from @o2k

Thank you so much, Prosper :)

Rated 5 out of 5 stars

Finally understand crypto taxation!

I enrolled in o2k's Bundle 1 and Bundle 2 courses, and they completely changed my understanding of crypto taxation.

The content is clear, practical, and covers everything you need to know about how crypto taxation really works.

The instructors explain complex regulations in a way that's easy to understand even if you're not a tax professional.

Highly recommend o2k for anyone wanting to properly understand digital asset taxation!

12 November 2025
Unprompted review
@o2k logo

Reply from @o2k

Thank you so much

Rated 5 out of 5 stars

Exceptional international tax…

Exceptional international tax expertise. Clear, structured, and pragmatic from day one. Complex cross-border issues were explained in a way that actually made sense, with a strong focus on risk management and long-term strategy rather than quick fixes. Communication was precise, timelines were respected, and every recommendation was grounded in solid legal reasoning. You get the feeling you’re working with someone who has seen every edge case and knows how to navigate them calmly and confidently. Highly recommended for anyone dealing with international structures or multi-jurisdictional tax questions.

29 January 2026
Unprompted review
@o2k logo

Reply from @o2k

Thank you, Harry. It was a pleasure working with you. For a non tax/legal person, you really understood everything and even contributed yourself.

Rated 5 out of 5 stars

Best in class

Best in class! Antonia and her team are excellent. Would truly recommend to everyone.

28 January 2026
Unprompted review
@o2k logo

Reply from @o2k

Thank you!

Rated 5 out of 5 stars

A must have for Web3 entrepreneurs

This company is highly competent in areas as regulatory, tax and compliance advisory advices relating to Web3 and crypto assets. Trustworthy, responsive and cost competitive!

16 April 2025
Unprompted review
@o2k logo

Reply from @o2k

Thank you! Appreciated

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