{
  "manageEntity": {
    "action": "Save",
    "entityId": "1409970220",
    "entityType": "Track",
    "nonce": "0xb579f85cea01bf37ef2f78e3206514960f4a3ca747ce55dbb8900ba433407cea",
    "signature": "0x8566a773fe8df5631f5021fc79a1beb413232b7ee231083b358301bf7a6d311b488dd1ef4951462452a98ed59ff8ff5b1bceade9bcf6d7c8936e25e5f1f546531c",
    "signer": "0xF66719AC0E8463f8c9660B4412B4972e1dB48183",
    "userId": "57021"
  }
}