{
  "manageEntity": {
    "action": "Save",
    "entityId": "511554",
    "entityType": "Track",
    "nonce": "0x4aa5e140cee02e64f20ab99a4444d44cf6edb294d344b73e0685b7a753637541",
    "signature": "0xfaeab1c5859746bd06400c5f3d16ca4c0d0207e01298b2da3cf3d51f52d46ae80fd68fca85006d6a394ef0ea0d107f1227309986fc1b2e735b604c2e19d825811b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}