Revert "feat(vendors): add EY starlight"

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to the IPTF Map are documented here.
 ## [Unreleased]
 
 ### Added
-- feat(pattern): [EY: Starlight](vendors/ey.md#starlight) - Solidity transpiler for private on-chain state. Consolidated EY products into a single vendor file.
+
 - feat(pattern): [Network-Level Anonymity](patterns/pattern-network-anonymity.md) - Umbrella pattern for transport-layer sender anonymity (Tor, mixnets, private RPC, TEE-assisted, VPN)
 - feat(pattern): [TEE-Assisted Network Anonymity](patterns/pattern-tee-network-anonymity.md) - TEE+secret-sharing approach for low-latency sender anonymity (Flashbots Flashnet)
 - feat(pattern): [Private Shared State](patterns/pattern-private-shared-state.md) - Umbrella pattern for multi-party private state (FHE, MPC+ZK, TEE comparison)

approaches/approach-private-broadcasting.md

@@ -47,7 +47,7 @@ These problems interact because traditional broadcasting requires public visibil
 - Hidden state with encrypted mempool
 - 2 categories:
   - Shared [Private Rollups](../patterns/pattern-privacy-l2s.md) (Aztec, Fhenix)
-  - Enterprise Rollups: [ZKsync Prividium](../vendors/zksync-prividium.md), [EY Nightfall](../vendors/ey.md#nightfall-v4)
+  - Enterprise Rollups: [ZKsync Prividium](../vendors/zksync-prividium.md), [EY Nightfall](../vendors/ey-nightfall.md)
 
 ### Recommended Architecture
 

vendors/ey-nightfall.md

@@ -0,0 +1,62 @@
+---
+title: "Vendor: EY Nightfall"
+status: production
+---
+
+# EY - Nightfall v4 (Enterprise Privacy Rollup)
+
+## What it is
+
+A production-ready Zero-Knowledge rollup for private token transfers with enterprise compliance features. Nightfall v4 implements a ZK rollup that provides immediate finality and supports ERC20, ERC721, ERC1155, and ERC3525 tokens with X509 certificate-based access control.
+
+## Fits with patterns
+
+- Private Stablecoin Shielded Payments
+- Privacy L2s
+- Regulatory Disclosure Keys Proofs
+- Private ISO20022
+
+## Not a substitute for
+
+- General-purpose privacy L2s (focused on enterprise transfers)
+- Public DeFi composability (limited composability by design)
+- Low-resource deployment environments (requires significant compute)
+
+## Architecture
+
+Client-Proposer model with separate containerized roles. Clients generate UltraPlonk proofs for private transactions and submit to Proposers who create Layer 2 blocks with rollup proofs. X509 certificate validation gates all network access. Uses commitment-nullifier privacy model (UTXO-style) with MongoDB storage for metadata and Merkle tree state. Supports webhook integration for asynchronous processing.
+
+## Privacy domains (if applicable)
+
+- Certificate-gated private transfers with immediate ZK rollup finality
+- Selective disclosure for regulatory compliance and audit trails
+- Enterprise treasury operations with confidential payment flows
+
+## Enterprise demand and use cases
+
+Target segments include multinational corporations, financial institutions
+
+## Technical details
+
+- UltraPlonk proof system with no per-circuit trusted setup
+- supporting ERC20/721/1155/3525 standards
+- RESTful APIs for deposit, transfer, withdraw operations with X-Request-ID tracking
+- Integration with LocalWallet, AzureWallet, and HSM for enterprise key management
+- Sophisticated chain reorganization handling and immediate finality from ZK rollup architecture.
+
+## Strengths
+
+- Production-ready with mature ZK technology and enterprise compliance features
+- Advanced cryptography using UltraPlonk proofs eliminating trusted setup requirements
+- Built-in X509 certificate validation and selective disclosure for regulatory compliance
+- Immediate finality from pure ZK rollup architecture (no optimistic challenge periods)
+
+## Risks and open questions
+
+- Extremely high compute requirements (144 cores, 750GB RAM) limit proposer decentralization
+- Complex infrastructure requirements may limit deployment scenarios
+- Limited composability compared to general-purpose privacy L2s
+
+## Links
+
+- [Nightfall v4 GitHub](https://github.com/EYBlockchain/nightfall_4_CE)