This story was originally published on HackerNoon at: https://hackernoon.com/designing-a-blockchain-based-universal-healthcare-identity-system-with-hyperledger-and-gcp.
A technical blueprint for building a blockchain-based Universal Healthcare ID system using Hyperledger Fabric, Google Cloud, and FHIR interoperability standards
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This story was written by: @dshivani. Learn more about this writer by checking @dshivani's about page, and for more stories, please visit hackernoon.com.

This article proposes a production-grade Universal Healthcare ID (UHID) architecture designed to solve patient identity fragmentation across the U.S. healthcare system. Using Hyperledger Fabric for decentralized identity anchoring, Google Cloud Platform for healthcare data infrastructure, and FHIR/SMART interoperability standards for EMR integration, the piece outlines a three-layer system for secure patient identity resolution, consent management, and cross-provider healthcare coordination. It also explores governance, HIPAA compliance, auditability, and privacy challenges associated with nationwide healthcare identity infrastructure

This story was originally published on HackerNoon at: https://hackernoon.com/bitcoin-miners-are-not-disappearing-they-are-being-repriced-as-ai-infrastructure.
Bitcoin mining difficulty fell 7.76% at block 941,472 on March 21, 2026, marking the second-largest negative adjustment of the year.
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This story was written by: @MichaelJerlis. Learn more about this writer by checking @MichaelJerlis's about page, and for more stories, please visit hackernoon.com.

Bitcoin mining difficulty fell 7.76% at block 941,472 on March 21, 2026, marking the second-largest negative adjustment of the year.

This story was originally published on HackerNoon at: https://hackernoon.com/critical-minerals-africa-and-the-case-for-tokenization-as-a-serious-financing-mechanism.
Africa holds 30% of the world's critical minerals but can't access the capital being built around them. Here's why tokenization may change that.
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This story was written by: @audreynesbitt. Learn more about this writer by checking @audreynesbitt's about page, and for more stories, please visit hackernoon.com.

Western governments have built a financing architecture that makes critical minerals projects bankable, but it was designed for allied nations. Africa holds the geology the world needs and is largely locked out of that system. Tokenization of real-world mining assets is one of the more credible mechanisms for closing that gap, but only where the legal, infrastructure, and regulatory conditions exist to support it.

This story was originally published on HackerNoon at: https://hackernoon.com/smart-contract-security-a-taxonomy-of-vulnerabilities-attacks-and-defenses.
A practical taxonomy of smart contract vulnerabilities, covering reentrancy, integer overflow, access control, MEV, invariant violations, and key defense strate
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This story was written by: @kamronbek. Learn more about this writer by checking @kamronbek's about page, and for more stories, please visit hackernoon.com.

Smart contracts are immutable once deployed. A single bug can drain millions in minutes. This article builds a practical taxonomy of the most dangerous vulnerability classes: reentrancy, integer overflow, access control, MEV, and invariant violations. Each section explains the vulnerability with Solidity code, formal notation, and systematic defenses.

This story was originally published on HackerNoon at: https://hackernoon.com/europe-is-tightening-crypto-rules-while-the-us-fights-over-them.
Europe and the US are taking sharply different approaches to stablecoin regulation as digital assets become embedded in global finance.
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This story was written by: @thetechpanda. Learn more about this writer by checking @thetechpanda's about page, and for more stories, please visit hackernoon.com.

This article examines the widening regulatory divide shaping the future of crypto and stablecoins. While the European Union moves toward stricter enforcement under MiCA to consolidate oversight and reduce systemic risk, major US banks are considering legal action against regulators over frameworks that may allow crypto firms to operate like banks without equivalent supervision. Together, these developments highlight competing visions for how digital finance should integrate into the global financial system.

This story was originally published on HackerNoon at: https://hackernoon.com/wefi-visa-deal-shows-stablecoins-still-need-a-spending-layer.
The volume is there. The checkout isn't. WeFi's stablecoin Visa card targets the gap between holding USDC and actually buying something with it.
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This story was written by: @gabrielmanga. Learn more about this writer by checking @gabrielmanga's about page, and for more stories, please visit hackernoon.com.

The volume is there. The checkout isn't. WeFi's stablecoin Visa card targets the gap between holding USDC and actually buying something with it.

This story was originally published on HackerNoon at: https://hackernoon.com/why-the-sec-delayed-prediction-market-etfs.
Prediction market ETFs were supposed to launch. The SEC paused them. Here's why settlement is broken, who has jurisdiction, and who ends up unprotected.
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This story was written by: @vitaliiyatskiv. Learn more about this writer by checking @vitaliiyatskiv's about page, and for more stories, please visit hackernoon.com.

Prediction market ETFs cleared the standard SEC review window, then the regulator asked for more time. The real issue is structural: event contracts settle on interpreted outcomes, not objective data, which creates ambiguity the ETF wrapper concentrates rather than resolves. There's also a jurisdiction gap between the CFTC, which oversees the underlying platforms, and the SEC, which oversees the fund. Neither agency has worked out what happens when those frameworks collide during a contested resolution with retail money already in the fund. The delay is likely temporary, but the problems it surfaces are not.

This story was originally published on HackerNoon at: https://hackernoon.com/is-bip-110-bitcoins-defense-against-spam-or-the-start-of-a-chain-split.
An opinion-driven analysis of BIP-110, Bitcoin spam mitigation, and the growing ideological conflict around arbitrary data on Bitcoin.
Check more stories related to web3 at: https://hackernoon.com/c/web3. You can also check exclusive content about #bitcoin, #bip-110, #spam-prevention, #spam-filter, #bitcoin-ordinals, #bitcoin-knots, #bitcoin-core, #hackernoon-top-story, and more.

This story was written by: @eduardoprospero. Learn more about this writer by checking @eduardoprospero's about page, and for more stories, please visit hackernoon.com.

This article examines the growing controversy surrounding BIP-110, a proposed Bitcoin soft fork aimed at mitigating arbitrary data and inscription-related spam on the Bitcoin blockchain. Framed from an anti-spam perspective, the piece argues that Ordinals, Runes, and recent Bitcoin Core changes threaten Bitcoin’s role as sound money, while also exploring broader tensions around governance, decentralization, node operation costs, and the future direction of the Bitcoin ecosystem.