{
  "manageEntity": {
    "action": "Save",
    "entityId": "15793452",
    "entityType": "Track",
    "nonce": "0x4678024f632a8eb21c37a9b6f6cb336b26d1a7e890e285187a5eba899d9c2756",
    "signature": "0x838bc69558bdf6b93c21fc4a268cb2e6ff66e98a70746ecd23ac7766898fa3982d1127f55b4b0b8933176d144787a4c96385e88c09a4d4ef8fb05e2de4e98fb31b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}