{
  "manageEntity": {
    "action": "Save",
    "entityId": "1251152753",
    "entityType": "Track",
    "nonce": "0x1dd8e315ec41f2988ccb6c5290b9416c4dc9662e72189e05500310059661afd4",
    "signature": "0xd4a6c07c42f9a62c2089535631cf8414e292f4ba75aba3a7b81fa094e9bc8a9f0f744bbf7182718ef121f0eb5ee725894b36f9adc77593eb4a53a90dda3d43851c",
    "signer": "0x1D0c500EC847246923045cB0a285242A93723f30",
    "userId": "302385956"
  }
}