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.

Class meets on Thursdays, 9:00 AM to 12:15 PM. Today is Tuesday. Next sign-in opens Thursday, October 15 at 9:00 AM.

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.

Details

Schedule
Thursdays, 9:00 AM to 12:15 PM (America/New_York)
Network
Arbitrum One
Contract
0x33820C178fb55581F69236f93a54dBE63d0197DF
Roster
Any wallet can sign in.