diff --git a/lib/facts/blob-service.js b/lib/facts/blob-service.js
new file mode 100644
--- /dev/null
+++ b/lib/facts/blob-service.js
@@ -0,0 +1,32 @@
+// @flow
+
+export type BlobServiceHTTPEndpoint = {
+  +path: string,
+  +method: 'GET' | 'POST' | 'PUT' | 'DELETE',
+};
+
+const httpEndpoints = Object.freeze({
+  GET_BLOB: {
+    path: '/blob/:holder',
+    method: 'GET',
+  },
+  ASSIGN_HOLDER: {
+    path: '/blob',
+    method: 'POST',
+  },
+  UPLOAD_BLOB: {
+    path: '/blob',
+    method: 'PUT',
+  },
+  DELETE_BLOB: {
+    path: '/blob/:holder',
+    method: 'DELETE',
+  },
+});
+
+const config = {
+  url: 'https://blob.commtechnologies.org',
+  httpEndpoints,
+};
+
+export default config;
diff --git a/lib/utils/blob-service.js b/lib/utils/blob-service.js
new file mode 100644
--- /dev/null
+++ b/lib/utils/blob-service.js
@@ -0,0 +1,54 @@
+// @flow
+
+import invariant from 'invariant';
+
+import type { BlobServiceHTTPEndpoint } from '../facts/blob-service.js';
+import blobServiceConfig from '../facts/blob-service.js';
+
+const BLOB_SERVICE_URI_PREFIX = 'comm-blob-service://';
+
+function makeBlobServiceURI(holder: string): string {
+  return `${BLOB_SERVICE_URI_PREFIX}${holder}`;
+}
+
+function isBlobServiceURI(uri: string): boolean {
+  return uri.startsWith(BLOB_SERVICE_URI_PREFIX);
+}
+
+function holderFromBlobServiceURI(uri: string): string {
+  invariant(isBlobServiceURI(uri), 'Not a blob service URI');
+  return uri.slice(BLOB_SERVICE_URI_PREFIX.length);
+}
+
+function holderFromURI(uri: string): ?string {
+  if (!isBlobServiceURI(uri)) {
+    return null;
+  }
+  return holderFromBlobServiceURI(uri);
+}
+
+function makeBlobServiceEndpointURL(
+  endpoint: BlobServiceHTTPEndpoint,
+  params: { +[name: string]: string } = {},
+): string {
+  let path = endpoint.path;
+  for (const name in params) {
+    path = path.replace(`:${name}`, params[name]);
+  }
+  return `${blobServiceConfig.url}${path}`;
+}
+
+function getBlobFetchableURL(holder: string): string {
+  return makeBlobServiceEndpointURL(blobServiceConfig.httpEndpoints.GET_BLOB, {
+    holder,
+  });
+}
+
+export {
+  makeBlobServiceURI,
+  isBlobServiceURI,
+  holderFromURI,
+  holderFromBlobServiceURI,
+  getBlobFetchableURL,
+  makeBlobServiceEndpointURL,
+};