{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x023bc8464ee4b7ced92f188e3ae503281534349cf6f312eb5fb0ed210b94cace",
    "signature": "0x7b5ddbeff55dff147a2d8dcd21a438fac44a77f8a29aafc23c4d361f25021ca03d0ce3bf922b985be427a73bf02b56b702078672c27cd40e7114244f4562c0521c",
    "signer": "0x5C40b7A4d7eFF7C2F861E6357FD69f07a7b59f7d",
    "userId": "321575597"
  }
}