diff --git a/README.md b/README.md
index 2d4dd32..2cdb5ce 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,8 @@ docs/
   platform-spec-alignment-review.md
   contracts/
     membership-platform-interfaces.md
+  conformance/
+    membership-gating-vectors.md
   schemas/
     offer.v1.schema.json
     entitlement.v1.schema.json
diff --git a/docs/conformance/membership-gating-vectors.md b/docs/conformance/membership-gating-vectors.md
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+# EDUT Membership and Entitlement Gating Conformance Vectors (v1)
+
+This document defines deterministic pass/fail vectors for membership-gated commerce.
+
+## Vector Group A: Wallet Intent and Signature
+
+1. A1 `intent_success`
+- Given valid wallet address, origin, and chain
+- When `POST /secret/wallet/intent` is called
+- Then status is `pending_signature` and nonce+deadline are returned
+
+2. A2 `intent_replay_blocked`
+- Given an already consumed `intent_id`
+- When verify is called again
+- Then request is rejected and state does not regress
+
+3. A3 `signature_address_mismatch`
+- Given signature recovered to wallet X and request address wallet Y
+- When verify executes
+- Then state becomes `rejected` and no membership quote is issued
+
+4. A4 `intent_expired`
+- Given intent past deadline
+- When verify executes
+- Then result is `intent_expired`
+
+## Vector Group B: Membership Mint Activation
+
+1. B1 `quote_requires_verified_signature`
+- Given designation not in `signature_verified`
+- When quote is requested
+- Then quote is denied
+
+2. B2 `quote_expired`
+- Given quote past deadline
+- When confirm is called
+- Then membership remains inactive
+
+3. B3 `confirm_tx_success`
+- Given valid tx hash with expected currency/amount/recipient
+- When confirm executes
+- Then state transitions to `membership_active`
+
+4. B4 `confirm_tx_wrong_amount`
+- Given tx amount does not match quote
+- When confirm executes
+- Then state remains `pending_membership_mint`
+
+5. B5 `confirm_tx_wrong_recipient`
+- Given tx recipient is not membership contract
+- When confirm executes
+- Then state remains `pending_membership_mint`
+
+6. B6 `confirm_wrong_chain`
+- Given tx on disallowed chain
+- When confirm executes
+- Then request fails closed
+
+## Vector Group C: Checkout Membership Gate
+
+1. C1 `checkout_block_no_membership`
+- Given wallet with no active membership
+- When checkout quote is requested
+- Then checkout is denied
+
+2. C2 `checkout_allow_active_membership`
+- Given wallet with active membership
+- When checkout quote is requested
+- Then quote is returned
+
+3. C3 `checkout_block_suspended_membership`
+- Given suspended membership
+- When checkout is requested
+- Then checkout is denied
+
+4. C4 `checkout_block_revoked_membership`
+- Given revoked membership
+- When checkout is requested
+- Then checkout is denied
+
+## Vector Group D: Entitlement Activation Gate
+
+1. D1 `activation_allow_active_entitlement`
+- Given entitlement state `ACTIVE`
+- When runtime activation is requested
+- Then activation succeeds
+
+2. D2 `activation_block_suspended`
+- Given entitlement state `SUSPENDED`
+- When runtime activation is requested
+- Then activation fails closed
+
+3. D3 `activation_block_revoked`
+- Given entitlement state `REVOKED`
+- When runtime activation is requested
+- Then activation fails closed
+
+4. D4 `activation_block_expired`
+- Given entitlement state `EXPIRED`
+- When runtime activation is requested
+- Then activation fails closed
+
+## Vector Group E: Evidence Integrity
+
+1. E1 `receipt_fields_complete`
+- Every successful membership and purchase receipt contains:
+  - wallet
+  - membership status snapshot
+  - offer_id
+  - policy_hash
+  - quote_id
+  - tx_hash
+  - chain_id
+  - entitlement_id (for purchase)
+
+2. E2 `receipt_hash_stable`
+- Given identical input payload
+- Receipt hash must be identical across replays
+
+3. E3 `audit_non_regression`
+- Once state reaches `membership_active`, audit log cannot be removed or mutated without append-only evidence entry
+
+## Pass Criteria
+
+A build is conformant only when all vectors pass.
+
+## Fail-Closed Rule
+
+Any uncertainty in chain confirmation, quote validity, policy hash, or state sync must block activation/purchase by default.