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Key Health Check

This is a simple Clarity smart contract that runs on the Stacks blockchain.

It contains a map that stores a user's principal and the last block height checked in at by calling the contract.

There are two functions:

  • check-in: public function that takes the contract-caller address and stores it in the map along with the current block height
  • last-checked: read-only function that requires a principal as input, then returns either the last block height they checked in or an error if not found

Testing

Given the simplicity of this contract I tested it via Clarinet Console, sample commands below:

::advance_chain_tip 5
(contract-call? .key-health-check check-in)
(contract-call? .key-health-check last-checked 'ST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM)
(contract-call? .key-health-check last-checked 'ST2NEB84ASENDXKYGJPQW86YXQCEFEX2ZQPG87ND)
::advance_chain_tip 95
(contract-call? .key-health-check check-in)
(contract-call? .key-health-check last-checked 'ST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM)