{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x972017aefdc56d8e93912fc56f625e2249d3e58c07f48c30d6663b7968bb667b",
    "signature": "0x20388a2ea222d40d1a4a0eaaa635d9dce1a6cf1be90650f4ed48b3de69ee7ae64f34a4811f1e27586f5d4375978b2fbbf09eeb21827371086c7a90fafa40e4951b",
    "signer": "0xba39E57aa62E649F2b3250E2Cf1456c117127a40",
    "userId": "555663956"
  }
}