{
  "manageEntity": {
    "action": "Save",
    "entityId": "974893777",
    "entityType": "Track",
    "nonce": "0x84c8cb2bc273ddb014e3a566a49925fd872485f1752ef968c1980eb15cb06c27",
    "signature": "0x4dd5201315c592a4a5ff455d6c699462d38be4a9987d7d4e4ba0a05c2a8a737e080ad53adfd3b2a17bb86ef292f1125f217aba3ecdb477213f15407aede188fc1c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}