{
  "manageEntity": {
    "action": "Save",
    "entityId": "657130292",
    "entityType": "Track",
    "nonce": "0x1568b090d736c773653bf707de6143da4efc632de85f5a0fa5f15cdff4cb38ca",
    "signature": "0x75e56e1cf62944a1400be6a050e796197a2fcc4745fafa66e7eb24912f2300621aeb3979fe30dd4a73f78a0b16f5f2efc3fd2896ebe927871b0c3d7b075a66e11b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}