{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616050645",
    "entityType": "Track",
    "nonce": "0x7502f6121b3abc9a5d092821a421f02f78ad545874a6de87850aad0130a8d766",
    "signature": "0x3e7e7865a6924f1e8dbcad1e4f04c98f77901a34852cfbbdaa65616580c8f0a62551999cb051f8ba6d1104a153b19f16f7fc42f27dc5937692bf9aa1cada4acf1b",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}