{
  "manageEntity": {
    "action": "Save",
    "entityId": "878046760",
    "entityType": "Track",
    "nonce": "0x37ff4ec986d2319c7e284eceb2b341effcc2900ecc428593e6d227f5a2b80e26",
    "signature": "0xc10f3be282404900428f95cda268030ac15a425725a2ce76c4e685a9463796cd0d4372502ae7c4beaa97214fd1ec86d815223e746ec3274273ef2ff334c5c1291b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}