Algorithm 7 Smart-Contract-Based SLA Compliance Enforcement

1:Input: SLA contract $\mathcal{S}=\{\mathrm{deadline},\max \text{\_}\mathrm{spoilage},\mathrm{reward},\mathrm{penalty}\}$, delivery log $\mathcal{D}$, sensor data $\mathcal{X}$   2:Output: Smart contract outcome (reward or penalty execution)   3:Extract delivery time $t_d$ and item condition $q_d$ from $\mathcal{D}$ and $\mathcal{X}$   4:Extract SLA thresholds: $t_{\max },q_{\min }$ from $\mathcal{S}$   5: if $t_d\le t_{\max }$ and $q_d\ge q_{\min }$ then   6:   Outcome: Success   7:   Trigger smart contract: execute reward payment $\mathcal{S}.\mathrm{reward}$   8: else   9:   Outcome: Violation 10:      if $t_d>t_{\max }$ then 11:         Log: "Late delivery by $(t_d-t_{\max })$ units" 12:      end if 13:      if $q_d<q_{\min }$ then 14:         Log: "Spoilage exceeded threshold by $(q_{\min }-q_d)$ units" 15:      end if 16:      Trigger smart contract: execute penalty $\mathcal{S}.\mathrm{penalty}$ 17: end if 18:Record outcome on blockchain ledger for transparency and auditability