diff --git a/packages/interface/src/capability.ts b/packages/interface/src/capability.ts
index 0c0b717d..49b18f68 100644
--- a/packages/interface/src/capability.ts
+++ b/packages/interface/src/capability.ts
@@ -1,7 +1,7 @@
 import { Ability, Capability, DID, Link, Resource } from '@ipld/dag-ucan'
 import * as UCAN from '@ipld/dag-ucan'
 import {
-  AuthorityProver,
+  SessionAuthorizer,
   Delegation,
   Result,
   Failure,
@@ -378,7 +378,7 @@ export interface ValidationOptions<
     PrincipalResolver,
     ProofResolver,
     RevocationChecker,
-    Partial<AuthorityProver> {
+    Partial<SessionAuthorizer> {
   capability: CapabilityParser<Match<C, any>>
 }
 
@@ -389,7 +389,7 @@ export interface ClaimOptions
     PrincipalResolver,
     ProofResolver,
     RevocationChecker,
-    Partial<AuthorityProver> {}
+    Partial<SessionAuthorizer> {}
 
 export interface DelegationError extends Failure {
   name: 'InvalidClaim'
diff --git a/packages/interface/src/lib.ts b/packages/interface/src/lib.ts
index c4b7b905..452b894d 100644
--- a/packages/interface/src/lib.ts
+++ b/packages/interface/src/lib.ts
@@ -978,7 +978,7 @@ export interface HTTPError {
 /**
  * Options for UCAN validation.
  */
-export interface ValidatorOptions extends PrincipalResolver, Partial<AuthorityProver> {
+export interface ValidatorOptions extends PrincipalResolver, Partial<SessionAuthorizer> {
   /**
    * Schema allowing invocations to be accepted for audiences other than the
    * service itself.
@@ -1097,13 +1097,16 @@ export interface PrincipalResolver {
 }
 
 /**
- * `AuthorityProver` provides a set of proofs of authority.
+ * `SessionAuthorizer` configures the means for authorizing a session.
  */
-export interface AuthorityProver {
+export interface SessionAuthorizer {
   /**
-   * Proof(s) of authority.
+   * Authorities we trust for session authorization. Note the authority for
+   * UCAN verification is implicitly trusted so need not be included here. This
+   * is typically used to provide additional authorities that are trusted to
+   * authorize a session.
    */
-  proofs: Delegation[]
+  sessionAuthorities: Principal[]
 }
 
 /**
diff --git a/packages/validator/src/lib.js b/packages/validator/src/lib.js
index 1b863d56..5fde4475 100644
--- a/packages/validator/src/lib.js
+++ b/packages/validator/src/lib.js
@@ -234,7 +234,7 @@ export const claim = async (
     resolveDIDKey = failDIDKeyResolution,
     canIssue = isSelfIssued,
     resolve = unavailable,
-    proofs: localProofs = [],
+    sessionAuthorities = [],
   }
 ) => {
   const config = {
@@ -245,7 +245,7 @@ export const claim = async (
     authority,
     validateAuthorization,
     resolveDIDKey,
-    proofs: localProofs,
+    sessionAuthorities,
   }
 
   const invalidProofs = []
@@ -569,13 +569,7 @@ const verifySignature = async (delegation, verifier) => {
  */
 const verifySession = async (delegation, proofs, config) => {
   // Recognize attestations from all authorized principals, not just authority
-  const withSchemas = config.proofs
-    .filter(
-      p =>
-        p.capabilities[0].can === 'ucan/attest' &&
-        p.capabilities[0].with === config.authority.did()
-    )
-    .map(p => Schema.literal(p.audience.did()))
+  const withSchemas = config.sessionAuthorities.map(a => Schema.literal(a.did()))
 
   const withSchema = withSchemas.length
     ? Schema.union([Schema.literal(config.authority.did()), ...withSchemas])
diff --git a/packages/validator/test/session.spec.js b/packages/validator/test/session.spec.js
index efdeb32d..dce91076 100644
--- a/packages/validator/test/session.spec.js
+++ b/packages/validator/test/session.spec.js
@@ -126,13 +126,7 @@ test('validate mailto attested by another service', async () => {
       }
       return { error: new DIDKeyResolutionError(did) }
     },
-    proofs: [
-      await attest.delegate({
-        issuer: w3,
-        audience: other,
-        with: w3.did()
-      })
-    ],
+    sessionAuthorities: [other]
   })
 
   assert.containSubset(result, {
@@ -785,9 +779,6 @@ test('fail with multiple invalid verifiers', async () => {
     }
   })
 
-  console.log('Result:', result)
-  console.log('Result error:', result.error)
-
   assert.match(
     `${result.error}`,
     /Proof .* does not has a valid signature from did:key:/