{
  "manageEntity": {
    "action": "Save",
    "entityId": "894684753",
    "entityType": "Track",
    "nonce": "0xa5936e8d5b329497f407d352bed8f10acebfcf0defab22e45628fdaa84aa25ca",
    "signature": "0x8dde679454ff4f11f0e2678d61255e516caa1925db01f025bb212c6676cb6d992e6f555e865c4ab018ed8c054f2558e56fdc6cd1fa0567d6cfd42a3d7d72a1121b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}