On Dec. 27, 2025, Bitcoin block 929,699 was mined, raising a thought experiment about using block height as a universal New Year reference instead of the civil calendar. The proposal treats consensus-verified block counts as a shared time layer for cross-border settlement, but the stochastic nature of block discovery creates multi-day uncertainty bands around any “year-end” block target. While exchanges and custodians could anchor reports and proofs to specific block hashes, tax rules and statutory reporting remain tied to jurisdictional time, forcing users and institutions to navigate block time and wall-clock time in parallel.

On Dec. 27, CEO Brian Armstrong said Coinbase is working with Hyderabad Police in India after the arrest of a former customer support agent linked to an insider bribery and data theft scheme. Public filings show the breach was discovered in May 2025, ultimately affecting 69,461 people and leading Coinbase to recognize $355 million in related costs across Q2 and Q3 2025.

Ethereum's 2026 plan is built around two parallel efforts: increasing rollup data capacity with blobs via Fusaka, which activated on Dec. 3, 2025, and lifting base-layer throughput through higher gas limits. That execution-side path relies on validators shifting from full block re-execution to verifying ZK execution proofs, supported by proposals such as PeerDAS, ePBS, BALs, and broader gas repricing. The roadmap introduces new liveness and decentralization risks tied to proving markets, bandwidth limits, and validator operations as upgrades like Glamsterdam and Hegota move through 2026 timelines.

On Dec. 26, 2024, Bitcoin closed at about $95,714. On Dec. 26, 2025, it traded near $88,500; at 10:24 am UTC the price was $88,694.67, up 1.51% over 24 hours with a market capitalization of $1.77 trillion and 24 hour volume of $33.4 billion, according to the article. The year end pattern suggests sentiment cooled from 2024 despite support from ETF flows.

Solana Mobile has ended software update and security patch support for the Saga phone, warning that app compatibility "cannot be guaranteed" and limiting Saga-specific customer service. Seeker devices remain supported and are slated to ship worldwide on Aug. 4, 2025, with SKR incentives planned for January 2026. The shift raises practical risks for wallets on unpatched Saga devices.

Fidelity's director of global macro Jurrien Timmer argues that Bitcoin has likely completed another four-year halving cycle after hitting an October high close to $125,000, with a potential peak near $126,200. He maps out a support zone between $65,000 and $75,000 based on historical drawdowns and cycle timing, suggesting 2026 could be a cooling "off-year" as ETF flows and macro conditions drive price behavior.

A court‑appointed administrator overseeing Terraform’s wind‑down sued Jump for $4 billion, alleging undisclosed trading and incentive arrangements used to defend TerraUSD’s peg, according to The Wall Street Journal. The dispute emerges as dollar‑pegged tokens gain roles in settlement and remittances, testing what $1 stability really entails. Jump has denied the claims.

Bitcoin does not store encrypted secrets on-chain, so a quantum computer would target signature forgery on revealed public keys rather than "decrypt" the ledger. The near‑term levers are public‑key exposure and wallet behavior, while migration to quantum‑resistant spending paths is a protocol and UX challenge rather than an immediate crisis.

Bitcoin traded near $89,000 after its 14-day relative strength index dropped below 30 in mid-November, a level many traders treat as a capitulation signal. An event-study chart shared by Julien Bittel compares this oversold break with the previous five such instances and sketches an average path toward roughly $180,000 about 90 days later, implying about a 105% gain if repeated. Analysts now focus on key levels such as $106,400, ETF flow trends, and liquidity conditions to gauge whether the current rebound can evolve from a range-bound bounce into a sustained advance.