diff --git a/packages/upload-api/src/blob/accept.js b/packages/upload-api/src/blob/accept.js
index 94bdd3f5f..12e1b2be5 100644
--- a/packages/upload-api/src/blob/accept.js
+++ b/packages/upload-api/src/blob/accept.js
@@ -54,6 +54,12 @@ export function blobAcceptProvider(context) {
         expiration: Infinity,
       })
 
+      // Publish this claim to the content claims service
+      const pubClaim = await publishLocationClaim(context, { digest, location: createUrl.ok })
+      if (pubClaim.error) {
+        return pubClaim
+      }
+
       // Create result object
       /** @type {API.OkBuilder<API.BlobAcceptSuccess, API.BlobAcceptFailure>} */
       const result = Server.ok({
@@ -137,3 +143,23 @@ export const poll = async (context, receipt) => {
 
   return { ok: {} }
 }
+
+/**
+ * @param {API.ClaimsClientContext} ctx
+ * @param {{ digest: API.MultihashDigest, location: API.URI }} params
+ */
+const publishLocationClaim = async (ctx, { digest, location }) => {
+  const { invocationConfig, connection } = ctx.claimsService
+  const { issuer, audience, with: resource, proofs } = invocationConfig
+  const res = await Assert.location
+    .invoke({
+      issuer,
+      audience,
+      with: resource,
+      nb: { content: { digest: digest.bytes }, location: [location] },
+      expiration: Infinity,
+      proofs,
+    })
+    .execute(connection)
+  return res.out
+}
diff --git a/packages/upload-api/src/types.ts b/packages/upload-api/src/types.ts
index c56d9a893..9e3fecb52 100644
--- a/packages/upload-api/src/types.ts
+++ b/packages/upload-api/src/types.ts
@@ -203,7 +203,7 @@ import { StorageGetError } from './types/storage.js'
 import { AllocationsStorage, BlobsStorage, BlobAddInput } from './types/blob.js'
 export type { AllocationsStorage, BlobsStorage, BlobAddInput }
 import { IPNIService, IndexServiceContext } from './types/index.js'
-import { ClaimsClientConfig } from './types/content-claims.js'
+import { ClaimsClientConfig, ClaimsClientContext } from './types/content-claims.js'
 import { Claim } from '@web3-storage/content-claims/client/api'
 export type {
   IndexServiceContext,
@@ -378,7 +378,7 @@ export type BlobServiceContext = SpaceServiceContext & {
   getServiceConnection: () => ConnectionView<Service>
 }
 
-export type W3ServiceContext = SpaceServiceContext & {
+export type W3ServiceContext = SpaceServiceContext & ClaimsClientContext & {
   /**
    * Service signer
    */
diff --git a/packages/upload-api/test/handlers/blob.js b/packages/upload-api/test/handlers/blob.js
index 10595937e..530fba4e1 100644
--- a/packages/upload-api/test/handlers/blob.js
+++ b/packages/upload-api/test/handlers/blob.js
@@ -9,6 +9,7 @@ import { alice, registerSpace } from '../util.js'
 import { BlobSizeOutsideOfSupportedRangeName } from '../../src/blob/lib.js'
 import { createConcludeInvocation } from '../../src/ucan/conclude.js'
 import { parseBlobAddReceiptNext } from '../helpers/blob.js'
+import * as Result from '../helpers/result.js'
 
 /**
  * @type {API.Tests}
@@ -426,6 +427,67 @@ export const test = {
       'accept was not successful'
     )
   },
+  'blob/accept publishes location claim to claims service': async (
+    assert,
+    context
+  ) => {
+    const { proof, spaceDid } = await registerSpace(alice, context)
+
+    const data = new Uint8Array([11, 22, 34, 44, 55])
+    const digest = await sha256.digest(data)
+    const size = data.byteLength
+
+    const service = createServer(context)
+    const connection = connect({ id: context.id, channel: service })
+
+    const blobAddInvocation = BlobCapabilities.add.invoke({
+      issuer: alice,
+      audience: context.id,
+      with: spaceDid,
+      nb: { blob: { digest: digest.bytes, size } },
+      proofs: [proof],
+    })
+    const receipt = await blobAddInvocation.execute(connection)
+    assert.ok(receipt.out.ok)
+
+    const nextTasks = parseBlobAddReceiptNext(receipt)
+    const { address } = Result.unwrap(nextTasks.allocate.receipt.out)
+    assert.ok(address)
+
+    if (address) {
+      const httpPut = await fetch(address.url, {
+        method: 'PUT',
+        mode: 'cors',
+        body: data,
+        headers: address.headers,
+      })
+      assert.equal(httpPut.status, 200, await httpPut.text())
+    }
+
+    const keys =
+      /** @type {API.SignerArchive<API.DID, typeof ed25519.signatureCode>} */
+      (nextTasks.put.task.facts[0]['keys'])
+    const blobProvider = ed25519.from(keys)
+    const httpPutReceipt = await Receipt.issue({
+      issuer: blobProvider,
+      ran: nextTasks.put.task.link(),
+      result: { ok: {} },
+    })
+    const httpPutConcludeInvocation = createConcludeInvocation(
+      alice,
+      context.id,
+      httpPutReceipt
+    )
+    const ucanConclude = await httpPutConcludeInvocation.execute(connection)
+    assert.ok(ucanConclude.out.ok)
+
+    // ensure a location claim exists for the content root
+    const claims = Result.unwrap(await context.claimsService.read(digest))
+    assert.ok(
+      claims.some(c => c.type === 'assert/location'),
+      'did not find location claim'
+    )
+  },
   'blob/add fails when a blob with size bigger than maximum size is added':
     async (assert, context) => {
       const { proof, spaceDid } = await registerSpace(alice, context)