nova-carbon-offset-market

;; Nova Carbon Offset Market
;; Trading platform for carbon credits

(define-constant ERR-INSUFFICIENT-CREDITS (err u100))

(define-map carbon-credits
    { owner: principal }
    { balance: uint }
)

(define-public (issue-credits (recipient principal) (amount uint))
    ;; In production, restricted to authorized verifiers
    (let
        (
            (current-balance (default-to u0 (get balance (map-get? carbon-credits { owner: recipient }))))
        )
        (ok (map-set carbon-credits
            { owner: recipient }
            { balance: (+ current-balance amount) }
        ))
    )
)

(define-public (retire-credits (amount uint))
    (let
        (
            (balance (default-to u0 (get balance (map-get? carbon-credits { owner: tx-sender }))))
        )
        (asserts! (>= balance amount) ERR-INSUFFICIENT-CREDITS)
        (ok (map-set carbon-credits
            { owner: tx-sender }
            { balance: (- balance amount) }
        ))
    )
)

(define-read-only (get-balance (account principal))
    (default-to u0 (get balance (map-get? carbon-credits { owner: account })))
)