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Twitter’s Jack Dorsey Slashes 4,000 Jobs at Block Because of AI

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Twitter’s Jack Dorsey Slashes 4,000 Jobs at Block Because of AI

Twitter co-founder Jack Dorsey said that his company, Block, will reduce its workforce by nearly half, cutting more than 4,000 employees and shrinking the company from over 10,000 staff to just under 6,000.

The company is reportedly laying off staff become of AI tools potentially making them redundant. 

AI-Driven Layoffs Continue

In a note to employees, Dorsey described the move as “one of the hardest decisions” in the company’s history. He said the layoffs were not driven by financial distress, stating that gross profit continues to grow and profitability is improving. 

Instead, he pointed to rapid advances in intelligence tools and a shift toward smaller, flatter teams as the reason for the restructuring.

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Affected employees will receive 20 weeks of salary plus one additional week per year of tenure. 

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They will also receive equity vested through the end of May, six months of healthcare coverage, corporate devices, and $5,000 in transition support. International terms will vary based on local laws.

Dorsey said he chose to act immediately rather than implement gradual reductions. He argued that repeated rounds of layoffs would damage morale and trust

Major Tech Companies Affected by Layoffs in 2025. Source: Novelvista

Block, formerly known as Square, operates merchant payment systems and the peer-to-peer service Cash App. 

Cash App allows users to buy and sell Bitcoin. The company also holds Bitcoin on its balance sheet and invests in Bitcoin infrastructure, including self-custody tools and mining initiatives. 

Dorsey has positioned Block as closely aligned with Bitcoin development.

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Previously, Dorsey co-founded Twitter in 2006 and served as CEO twice. He stepped down in November 2021. 

In October 2022, Elon Musk completed the acquisition of Twitter and later rebranded it as X. Dorsey publicly supported the takeover at the time.

The restructuring marks a significant shift for Block as Dorsey moves to run the company with smaller teams and intelligence-driven systems at its core.

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Circle Reveals Plans for Native Arc Token

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Circle Reveals Plans for Native Arc Token

Circle is advancing its Arc blockchain project, with plans for a native token, according to CEO Jeremy Allaire.

Circle, one of the largest stablecoin issuers in the industry, is exploring the possibility of a native token for its Arc blockchain, according to the company’s chief executive Jeremy Allaire.

During the company’s Q4 2025 earnings call, Allaire said Circle is exploring a native token for the Arc blockchain and that the company is gaining a strong understanding of how it would work.

“We’re getting a very good understanding of how a token can play a key role in providing stakeholder incentives, governance, security, utility and other things on the Arc network,” Allaire said, though no timeline for a launch was revealed.

The company launched the public testnet for Arc in October 2025, with plans for a full mainnet release expected later this year.

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Circle announced Arc in August last year, designing the network specifically for issuing and transacting stablecoins. As The Defiant reported, the network would focus on faster settlement and lower transaction costs compared with existing public blockchains.

Kevin Lehtiniitty, CEO of Borderless.xyz, told The Defiant last year that the competition for the “stablecoin chain” just brings the industry back to fragmented payment systems with new branding. As Lehtiniitty explained, “The answer that does push open finance forward in my mind is connectivity and interoperability; not another chain or another token.”

This article was generated with the assistance of AI workflows.

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Buterin Outlines Ethereum’s Quantum Resistance Roadmap

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Buterin Outlines Ethereum’s Quantum Resistance Roadmap

Ethereum co-founder Vitalik Buterin has identified and proposed a plan to address four areas of the network that he sees as most quantum-vulnerable.

Quantum computing and crypto have been in the headlines recently as concerns mount over Bitcoin and other blockchains’ resistance to quantum-capable supercomputers.

Buterin posted his quantum resistance roadmap for Ethereum on Thursday, stating that the four areas are: validator signatures, data storage, user account signatures, and zero-knowledge proofs.

He said that replacing the current BLS (Boneh-Lynn-Shacham) consensus signatures with “Lean” quantum-safe hash-based signatures would fix that component. The tricky part is picking the right hash function, since this choice will likely stick around for a long time.

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“This may be ‘Ethereum’s last hash function’, so it’s important to choose wisely,” he said. 

Ethereum Foundation researcher Justin Drake proposed “Lean Ethereum,” a plan to make the network quantum-secure, in August 2025. 

Quantum safe data storage and accounts  

Regarding data storage, or “blobs”, Ethereum currently uses a system called KZG (Kate-Zaverucha-Goldberg) for storing and verifying data. 

The plan is to swap this out for STARKs (Zero-Knowledge Scalable Transparent Argument of Knowledge), which are quantum-resistant. “It’s manageable, but there’s a lot of engineering work to do,” said Buterin.

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Related: Buterin outlines 4-year roadmap to speed up and quantum-proof Ethereum

The third challenge is user accounts. Ethereum currently uses ECDSA (Elliptic Curve Digital Signature Algorithm) signatures, which are standard cryptographic keys. The fix is to upgrade the network so that accounts can use any signature scheme, including “lattice-based” quantum-resistant ones.

However, quantum-safe signatures are much heavier computationally and would consume more gas.

“The long-term fix is protocol-layer recursive signature and proof aggregation, which could reduce these gas overheads to near-zero,” he said. 

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Quantum-resistant proofs are very expensive 

Quantum-resistant proofs are extremely expensive to run onchain so “the solution again is protocol-layer recursive signature and proof aggregation,” said Buterin.

Instead of verifying every signature and proof individually onchain, a single master proof or “validation frame” would verify thousands of them at once, keeping costs near zero.

“This way, a block could ‘contain’ a thousand validation frames, each of which contains either a 3kB signature or even a 256kB proof,” he explained. 

Buterin floated the concept of a recursive-STARK-based bandwidth-efficient mempool in January. Source: ETHresearch

Buterin also commented on the Ethereum Foundation’s “Strawmap” on Thursday, stating that he expects to see “progressive decreases of both slot time and finality time.” 

Magazine: Bitcoin may take 7 years to upgrade to post-quantum: BIP-360 co-author

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