Share this article

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.

STORY CONTINUES BELOW
Don't miss another story.Subscribe to the Crypto Daybook Americas Newsletter today. See all newsletters

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.

More For You

Protocol Research: GoPlus Security

GP Basic Image

What to know:

  • As of October 2025, GoPlus has generated $4.7M in total revenue across its product lines. The GoPlus App is the primary revenue driver, contributing $2.5M (approx. 53%), followed by the SafeToken Protocol at $1.7M.
  • GoPlus Intelligence's Token Security API averaged 717 million monthly calls year-to-date in 2025 , with a peak of nearly 1 billion calls in February 2025. Total blockchain-level requests, including transaction simulations, averaged an additional 350 million per month.
  • Since its January 2025 launch , the $GPS token has registered over $5B in total spot volume and $10B in derivatives volume in 2025. Monthly spot volume peaked in March 2025 at over $1.1B , while derivatives volume peaked the same month at over $4B.

More For You

Bitcoin drifts lower as $81.3k emerges as the market’s key fault line: Asia Morning Briefing

Bitcoin Logo (Midjourney/modified by CoinDesk)

With large caps still tracking bitcoin and high-beta assets already weakened, Glassnode’s True Market Mean has become the line investors are watching most closely.

What to know:

  • Bitcoin's True Market Mean at $81.3k is a critical level, with potential market-wide implications if breached.
  • Large-cap crypto assets remain closely correlated with bitcoin, reinforcing its role as the market's anchor.
  • Gold prices have surged to record highs, driven by central bank buying and geopolitical risks, with forecasts suggesting further increases.