{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0cb480609bdbd7880bc9944e0b11dcb3dc729e3d9bc1e9f9b410dbc473a2eeb5",
    "signature": "0x265c7c949b01568f5cd1bbb4a63de43c01784a5636d5e6c898f283ca4bf1878c22c3d3cbb894ec3f64008bb6a8ab9231e2caf9614de6f44b25e998f52e56e0e01b",
    "signer": "0x52Cb91F38E0558Bc7C3b3F9e2A6a4f8AA31f5d5a",
    "userId": "129460210"
  }
}