{
  "manageEntity": {
    "action": "Save",
    "entityId": "638239656",
    "entityType": "Track",
    "nonce": "0x742bb388696f1b3804487276e98df7fa21df2d47a351ac27c8290674fb5a1b13",
    "signature": "0x11947dc587441f914847fb32935dbef6cda0ad612684f1e1b7d7165cffad81aa297e50d979141890a9e8cc8abfac22d70be0fd2c8a0e492a658f8d40196da5181c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}