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Email Paywall System ‘Mailman' Wins Coinbase Hackathon

Mailman has won Coinbase's second hackathon, which gave away $70,000 worth of bitcoin in prizes.

Updated Apr 10, 2024, 3:12 a.m. Published Jul 3, 2015, 10:03 a.m.
bitcoin hackathon winner

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.

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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 DixonFred Wilson and Gavin Andresen.

Winning medal image via Shutterstock.

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KuCoin Hits Record Market Share as 2025 Volumes Outpace Crypto Market

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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

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From yield potential to custody risks, here’s how direct ETH and staking funds compare for different investor goals.

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  • Investors can now choose between owning ether directly or buying shares in a staking ETF that earns rewards on their behalf.
  • While staking ETFs offers yield, they come with risks and less control than holding ETH in an exchange or wallet.
  • Grayscale’s Ethereum staking ETF recently paid $0.083178 per share, yielding $3.16 in rewards on a $1,000 investment.