Web3 signing architecture combining AWS EKS, HCP Vault, and Web3Signer for secure blockchain transaction signing with Kubernetes-native secret injection. Users and DApps send HTTPS requests through ALB and WAF to the API Gateway, which routes to application services and the blockchain signing layer where Web3Signer handles transaction signing via Vault-injected credentials. External Secrets Operator syncs HCP Vault secrets (Transit Engine and KV Secrets) into Kubernetes as mounted volumes, with Vault Agent Injector providing sidecar-based secret delivery and AWS KMS auto-unsealing Vault for high availability. This architecture demonstrates zero-trust principles by isolating signing operations in a dedicated pod group, encrypting secrets in transit, and leveraging Kubernetes RBAC with Vault's Kubernetes Auth Method. Fork and customize this diagram on Diagrams.so to adapt signing thresholds, add additional blockchain adapters, or integrate with your CI/CD pipeline for automated deployment.