{
  "manageEntity": {
    "action": "Save",
    "entityId": "1878243143",
    "entityType": "Track",
    "nonce": "0x601a85269f534d01a6040b69b02781a67a4961eb874a5468fc9090cbb0db8796",
    "signature": "0x54df962d65f9395745b134b11e76ff9139b04f8cf577df39770182a0630d49b8743c28fe3387cbada0d2632241c52449bdc93057521fe2e56c975b14d0c290561b",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}