#blockchain · 8sync News

Double Spending: The Problem That Made Decentralized Digital Money Seem Impossible

Digital information can be copied infinitely, but money requires exclusive ownership — this is the double-spending problem that made decentralized digital currency seem impossible for years. Centralized systems like banks solve it via a trusted ledger, but Bitcoin's 2008 breakthrough eliminated the need for a central authority by combining a distributed blockchain ledger, cryptographic digital signatures, and a Proof of Work consensus mechanism. The result: thousands of strangers can agree on who owns what without trusting any single party. Residual risks remain — unconfirmed transactions, 51% attacks, and weakly secured networks — but the core problem is largely solved, forming the foundation for every blockchain that exists today.

Unbounded State Bloat: How I Found a Chain-Halting DoS Bug in Injective’s Peggy Bridge

A security researcher details the discovery of a chain-halting DoS vulnerability in Injective's Peggy Bridge during a Code4rena audit. The bug stems from unbounded state accumulation in the rate limiting module: every bridge transfer appends to an uncapped slice, and the Cosmos SDK EndBlocker iterates over all tokens × all transfers on every block, creating O(N×M) complexity. An attacker can bloat state with dust transactions across many tokens, causing CPU exhaustion that exceeds consensus timeouts and halts the chain. A PoC unit test confirmed 100% CPU spike. The recommended fix involves hard caps on the Transfers slice and efficient KVStore indexing using composite keys for range-based pruning.

The EF’s new structure

The Ethereum Foundation (EF) has completed a major reorganization, reducing its workforce by 54 people (roughly 20%) and restructuring into five domain clusters: Protocol Layer, Access Layer, User Layer, Community Layer, and Institutional Layer, plus operations and management clusters. The Protocol Layer focuses on hardening and scaling Ethereum's core protocol while preserving censorship resistance, privacy, and security. The Access Layer ensures self-sovereignty is practically available for key user actions. The User Layer grounds EF work in real user needs. The Community Layer manages EF's public presence and external relationships. The Institutional Layer engages enterprises, governments, and nonprofits on Ethereum adoption. Departing employees receive severance of one month per year worked (or local legal minimum, whichever is higher) plus transition support including career coaching grants.