{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3c6cc27962d85c4a8cbbaecb8217d0feb4e68fcbfcca4e5fa1abb2f275efc37a",
    "signature": "0x9b1202e47db4faaac535d5a921ab77f8968f63d1f4bc364c5ab0d96cae7d97557f42eb0394666c270efb9da25d17fae4679cf468955a7998ef2c3b7477712f741b",
    "signer": "0x866189a6790Cbf46948B32D6067D8D60535Cf843",
    "userId": "732399724"
  }
}