> For the complete documentation index, see [llms.txt](https://docs.derupt.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.derupt.io/latest/contracts/.derupt-stackers.md).

# .derupt-stackers

**The following function calls are only callable by .derupt-core-yyyymmdd:**

* log-stack
* log-stacking-claim-reward

{% hint style="info" %}
Work in Progress
{% endhint %}

```
;; title: derupt-stackers
;; version: 1.3.1
;; summary: Stackers Contract
;; description: used to log stacking and stacking reward claims

(define-constant ERR-UNAUTHORIZED (err u100))
(define-constant ERR-NOTFOUND (err u101))

;; Get Derupt core contract
(define-read-only (get-derupt-core-contract)
  (contract-call? .derupt-feed get-derupt-core-contract)
)

;; Log Stack
(define-public (log-stack (stacker principal) (dislike-ft-total uint) (lockPeriod uint))
  (let
    ((derupt-core-contract (unwrap! (get-derupt-core-contract) ERR-NOTFOUND))) 
    (asserts! (is-eq contract-caller derupt-core-contract) ERR-UNAUTHORIZED)
    (print { event: "stack", stacker: stacker, dislike-ft-total: dislike-ft-total, lockPeriod: lockPeriod })
    (ok true)
  )
)

;; Log Stacking Reward Claim
(define-public (log-stacking-reward-claim (targetCycles (list 32 uint)))
  (let 
    ((derupt-core-contract (unwrap! (get-derupt-core-contract) ERR-NOTFOUND))) 
    (asserts! (is-eq contract-caller derupt-core-contract) ERR-UNAUTHORIZED)
    (print { event: "stacking-reward-claim", stacker: tx-sender, targetCycles: targetCycles })
    (ok true)
  )
)
```


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