Blockchain and Cryptocurrency

Columbia Business School · Fall 2026

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Tap the coin with your phone to sign in.

Hold the top of your phone against the coin. A notification will appear. Tap it, confirm your wallet, and an attendance NFT is minted to you.

Sign-in is open now for Tuesday, October 27, 2026.

Before class

  1. Install MetaMask on your phone and create or import your wallet.
  2. Make sure your phone can read NFC: iPhone XS or newer, or an Android phone with NFC on.

In class

  1. Hold the top of your phone to the coin and open the notification.
  2. First time only: tap Connect MetaMask, approve in MetaMask, come back, tap Sign & sign in, approve again.
  3. Every week after that: tap the coin, open the notification, and you are signed in automatically.

Your badges

Every class you attend mints one badge to your wallet. After your first sign-in, they are listed here on this phone, no wallet app needed.

Details

Schedule
Thursdays, 9:00 AM to 12:15 PM (America/New_York)
Network
Arbitrum One
Contract
0x36aee627877c22CB1B0ca8391C4Ba3760c510888
Roster
Any wallet can sign in.