{
  "manageEntity": {
    "action": "Save",
    "entityId": "266309448",
    "entityType": "Track",
    "nonce": "0x0e87e9c1e1d886abd144a11ebdae3f245c8be9d4a25aa331219fba6cec4dfd0b",
    "signature": "0x23da333843b6837f0ec2b61c4a8a2e794a1a3a3d1876cdbfdb589c60e99ced7b124f7d8de2dd6b72761afd014ee9a5b2d402b0e47c32a1916844f7ddffd178431b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}