{
  "manageEntity": {
    "action": "Save",
    "entityId": "444354497",
    "entityType": "Track",
    "nonce": "0xd91bef57a97a16e219d09c1fe4cbd1a559dc9827ef46a874e9c3359b46788e44",
    "signature": "0x2cd3b70140f3688040107cb7c202b6f1892cde8420afad4626b11df5b1488880527262c97cc36fe0ba1e162aec20de62b0f5a96888b177b7b1e89211400005531c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}