{
  "manageEntity": {
    "action": "Save",
    "entityId": "485231518",
    "entityType": "Track",
    "nonce": "0xb665e55850c75b3b2b6444aaab43b7ec18ce40a2acfa37e8c2fdf6945155ca97",
    "signature": "0xa85729901a597ac40d49272e056a51595a7ea53f6c2d1934c93fd398aa61b34347504b602e7a78e4dc4e8f709c455853b599e1fcf477b53b8c26050f2bc54b2b1b",
    "signer": "0x94072C091E5edAf7bbccf2aC8257a1590541a307",
    "userId": "987917854"
  }
}