{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4c25472e440b19665a4076d6cb66c1acf8979004dd9a3a7c519ff37300dcbcd1",
    "signature": "0x23cf60bf69103143e473010c3841daa8e928009c6e6f3bc82ccf508c3110e4f739806287ee39a3a37da18143ef17f5d9112a0c569d1352ecf4cceb6d6cdcd6371b",
    "signer": "0x66008518C65C48901f513b6ECea53397aDFd1500",
    "userId": "359981248"
  }
}