{
  "manageEntity": {
    "action": "Save",
    "entityId": "54738954",
    "entityType": "Track",
    "nonce": "0x70c8d03c592b535bdc657933d4593a24c834f0b057d7e19a6ef5ac167f6eda9c",
    "signature": "0x9f0feb6c53a72f8977751cb5f21395c55ecfc7087c32562ccba3e6590f722b620c03086c79379fd87d7d19b2793d23e4dc281a7a9b6448a858a0e905dacefd241c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}