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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Bitcoin stuck near $88,000 as gold's and silver's record-breaking rallies show exhaustion signs

"Gold and silver casually adding an entire bitcoin market cap in a single day," wrote one crypto analyst.
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