Email Paywall System ‘Mailman' Wins Coinbase Hackathon
Mailman has won Coinbase's second hackathon, which gave away $70,000 worth of bitcoin in prizes.

Email paywall system Mailman has won Coinbase's second hackathon, which gave away $70,000 worth of bitcoin in prizes.
The system, which rewards consumers in bitcoin and uses the blockchain to filter spam messages, received a $10,000 prize in bitcoin and a place on Boost VC's bitcoin accelerator class, reportedly worth $50,000.
Coming in second and receiving a prize of $5,000 was SatoshiPay, a bitcoin paywall for publishers.
Remittance aggregator Rebittance came third, receiving $3,000, while BlockchainME, a tool which creates verifiable IDs on the blockchain, came in fourth and received $1,500. BitcoinDial, a bitcoin mobile top-up service, was last, receiving $500.
The competition, which received 84 qualified submissions from twelve countries, was judged by Adam Draper, Chris Dixon, Fred Wilson and Gavin Andresen.
Winning medal image via Shutterstock.
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KuCoin captured a record share of centralised exchange volume in 2025, with more than $1.25tn traded as its volumes grew faster than the wider crypto market.
What to know:
- KuCoin recorded over $1.25 trillion in total trading volume in 2025, equivalent to an average of roughly $114 billion per month, marking its strongest year on record.
- This performance translated into an all-time high share of centralised exchange volume, as KuCoin’s activity expanded faster than aggregate CEX volumes, which slowed during periods of lower market volatility.
- Spot and derivatives volumes were evenly split, each exceeding $500 billion for the year, signalling broad-based usage rather than reliance on a single product line.
- Altcoins accounted for the majority of trading activity, reinforcing KuCoin’s role as a primary liquidity venue beyond BTC and ETH at a time when majors saw more muted turnover.
- Even as overall crypto volumes softened mid-year, KuCoin maintained elevated baseline activity, indicating structurally higher user engagement rather than short-lived volume spikes.
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Crypto ETFs with staking can supercharge returns but they may not be for everyone

From yield potential to custody risks, here’s how direct ETH and staking funds compare for different investor goals.
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- Grayscale’s Ethereum staking ETF recently paid $0.083178 per share, yielding $3.16 in rewards on a $1,000 investment.











