# Adam Back

> Adam Back is a post-ipo equity investor at Blockstream backing Bitcoin and Blockchain. See 15 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Blockstream](https://shizune.co/investors/profile/blockstream)
- Total investments: 15
- Last investment: May 2026
- Lead investor: 53%
- Last updated: Aug 2026
- LinkedIn: http://www.linkedin.com/pub/adam-back/0/342/43
- X (Twitter): http://twitter.com/adam3us
- Website: https://x.com/adam3us

Adam Back is a post-ipo equity investor at Blockstream focused on Bitcoin and Blockchain. Having worked on e-cash protocols since 1995, Adam is an applied cryptographer and inventor of the hashcash proof-of-work and decentralized mining used in Bitcoin.In addition to implementing credlib, he was an e-cash consultant to Nokia and later to Credentica (acquired by Microsoft). Adam was an architect and cryptographer at Zero-KnowledgeSystems working on its Freedom network, a precursor to Tor. He has also consulted for leading security companies, including oneID, Vmware and QWcap. Most recently, Adam co-founded Picorp, which was acquired by EMC and where he was CSO of the company’s consumer division, Decho. Adam holds a Ph.D. in distributed systems and computer science from the University of Exeter.

## Round sizes

| Stage | Round size |
| --- | --- |
| Post-IPO Debt | $3.3M–$13M |
| Post-IPO Equity | $788k–$510M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Bitcoin | 3 | 20% |
| Blockchain | 2 | 13% |
| Video Games | 2 | 13% |
| Cryptocurrency | 2 | 13% |
| Gaming | 1 | 7% |

16 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Post-IPO Equity | 4 | 27% |
| Funding Round | 2 | 13% |
| Post-IPO Debt | 2 | 13% |
| Seed | 1 | 7% |
| Private Equity | 1 | 7% |

6 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 2 | 13% |
| China | 1 | 7% |
| France | 1 | 7% |
| Sweden | 1 | 7% |
| Hong Kong | 1 | 7% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Capital B | The Blockchain Group is  a blockchain-powered ecosystem. They enable firms to utilize the ability of distributed energy through their many divisions. They offer to incubate, build, develop operationally, and strategically invest in internet and technology companies. | $17.9M | Post-IPO Equity | May 11, 2026 |  |
| Capital B | The Blockchain Group is  a blockchain-powered ecosystem. They enable firms to utilize the ability of distributed energy through their many divisions. They offer to incubate, build, develop operationally, and strategically invest in internet and technology companies. | $1.3M | Post-IPO Equity | May 04, 2026 |  |
| XCE | Connecting Excellence Group PLC (XCE) is a international executive recruitment firm that has integrated Bitcoin as a central component of its corporate treasury and growth strategy. The company focuses on a dual approach to growth that leverages its human capital and financial strategy. | $788.4K | Post-IPO Equity | Apr 23, 2026 |  |
| Resolvr | Resolvr facilitates cross-border reinsurance transactions at 10% of the cost and 5x the speed of traditional payment methods, greatly reducing foreign exchange costs, transaction fees, and administrative back office burden. |  | Seed | Sep 16, 2025 |  |
| EchoX | EchoX is a leading Web3 solutions provider in the Asia-Pacific region, dedicated to bridging traditional finance with blockchain innovation. The company specializes in delivering compliant cross-border virtual asset services and comprehensive digital finance tools for financial institutions, enterprises, and high-net-worth individuals. Theseofferings include digital asset management platforms, payment solutions, and web-based applications. With deep expertise in blockchain technology, EchoX continues to expand real-world applications of digital assets, drive fintech innovation, and foster the development of the digital asset ecosystem across APAC. |  |  | Sep 04, 2025 |  |
| Capital B | The Blockchain Group is  a blockchain-powered ecosystem. They enable firms to utilize the ability of distributed energy through their many divisions. They offer to incubate, build, develop operationally, and strategically invest in internet and technology companies. | $7M | Post-IPO Equity | Jul 15, 2025 |  |
| Capital B | The Blockchain Group is  a blockchain-powered ecosystem. They enable firms to utilize the ability of distributed energy through their many divisions. They offer to incubate, build, develop operationally, and strategically invest in internet and technology companies. | $4.3M | Post-IPO Equity | Jun 13, 2025 |  |
| H100 Group | H100 is a data-driven, scalable model to optimize user health journeys by integrating digital health services, professional coaching, and AI-enhanced insights. | $7.3M | Post-IPO Equity | Jun 11, 2025 |  |
| H100 Group | H100 is a data-driven, scalable model to optimize user health journeys by integrating digital health services, professional coaching, and AI-enhanced insights. | $3.3M | Post-IPO Debt | Jun 11, 2025 |  |
| H100 Group | H100 is a data-driven, scalable model to optimize user health journeys by integrating digital health services, professional coaching, and AI-enhanced insights. | $2.2M | Post-IPO Equity | May 26, 2025 |  |

10 of 15 investments shown.

## Co-investors
- [TOBAM](https://shizune.co/investors/profile/tobam) — VC Fund, 2 deals together
- [UTXO Management](https://shizune.co/investors/profile/utxo-management) — VC Fund, 2 deals together
- [AC Capital](https://shizune.co/investors/profile/ac-capital) — VC Fund, 1 deal together
- [ACTAI Ventures](https://shizune.co/investors/profile/actai-ventures) — VC Fund, 1 deal together
- [Alundo Invest](https://shizune.co/investors/profile/alundo-invest) — VC Fund, 1 deal together
- [Arrington Capital](https://shizune.co/investors/profile/arrington-capital-9858) — VC Fund, 1 deal together

## About Blockstream

VC Fund · Victoria, Canada

Blockstream is a blockchain technology supplier that has remained at the forefront of cryptography and distributed system research. Their products and services form the foundation for the financial infrastructure of the future. Blockstream offers a range of key products and services designed to enhance Bitcoin and blockchain functionality. Notableofferings include Blockstream Satellite, which broadcasts the Bitcoin blockchain via satellite for users without internet access, and the Liquid Network, a sidechain solution that enables faster and more confidential transactions. Their Green Wallet is a non-custodial Bitcoin wallet focused on security and user control. Additionally, Blockstream provides blockchain APIs for developers to integrate blockchain functionalities into their applications, along with solutions for efficient Bitcoin mining operations. They also focus on cryptographic proofs to enhance privacy and security in transactions. Together, these products aim to improve the usability and capabilities of Bitcoin and blockchain technologies.

5 contacts available at Blockstream.

| Name | Title | Profile |
| --- | --- | --- |
| Adam Back | CEO | https://shizune.co/investors/profile/adam-back |
| Andrew Poelstra | Director of Research | https://shizune.co/investors/profile/andrew-poelstra |
| Basak Haznedaroglu | Head of Design | https://shizune.co/investors/profile/basak-haznedaroglu |
| Christian Decker | Core Tech Engineer | https://shizune.co/investors/profile/christian-decker |
| Erik Svenson | Co-Founder & Chief Operating Officer | https://shizune.co/investors/profile/erik-svenson |

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## FAQ

### What does Adam Back invest in?

Adam Back invests primarily in Bitcoin, Blockchain and Video Games startups, most often at Post-IPO Equity and Funding Round stage. Most of the 15 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Adam Back's check size?

Adam Back typically joins rounds of $3.3M–$13M at Post-IPO Debt and $788k–$510M at Post-IPO Equity. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Adam Back participates in.

### When did Adam Back last invest?

The most recent investment recorded for Adam Back closed in May 2026. Shizune tracks 15 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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