{
  "manageEntity": {
    "action": "Save",
    "entityId": "557780832",
    "entityType": "Track",
    "nonce": "0x4862041b08b21a0f751dcf87fae7c32ce91050af9ea5c26a7bb0116eff0c1b57",
    "signature": "0xfc6c6642d8aeaccca9d16130b775ffa1b2b3ee9ed76091b85fdf75bf01dfd1f957aa26d4bfc7c4c50d2e6625585129a6ff1cbfcfa751de257479463de069056e1b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}