{
  "manageEntity": {
    "action": "Save",
    "entityId": "726397655",
    "entityType": "Track",
    "nonce": "0xce9c2830314ca1138482c38a2b595f592ce3e433c7cf4aadd0de55542960d5b5",
    "signature": "0x868a629879f839299b710bb51b38f720cb53fd3adc123dba05af30f7ebe86b373103821911b79d80474994874e541e847b9483c6e319f3b619c4f6af3b59f1c71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}