{
  "manageEntity": {
    "action": "Save",
    "entityId": "604202",
    "entityType": "Track",
    "nonce": "0x3423e0be603ca4653f3a2184dde2e822d29681099cc09b5778e9610c3747032e",
    "signature": "0xcaa6e7a248266799011aa860655026dab7d490a405618577cb3e88193520a07779bb018a53cf538699e846d3c273596e2984745f178c0086e3aedafcddea36721c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}