{
  "manageEntity": {
    "action": "Save",
    "entityId": "455003797",
    "entityType": "Track",
    "nonce": "0x8d5db3800f56b8dfa58104d58efb5983ce83af90da76b1698a2bb72d01e61064",
    "signature": "0xbb68ed5bd061867e01d2017eb2838eebdf0e9a533cd0d0a37aa37480fd88c57a59ed9a29a023fc5052368a2e175122fea31bfb6fafcc92566ed610d0c571046c1b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}