{
  "manageEntity": {
    "action": "Save",
    "entityId": "815487271",
    "entityType": "Track",
    "nonce": "0x4d53af962ddf878c563732716b36bbf8ad51ff16fea73242686abb251cf37c86",
    "signature": "0xda42753f628332ba7748e0d300520e5fcc540f9646f9c8a909cbe4a840459de82edd579b66d7f13e7a719c858c61357d09938890676c5c313dc6eb73b6ea3bbd1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}