{
  "manageEntity": {
    "action": "Save",
    "entityId": "477774765",
    "entityType": "Track",
    "nonce": "0x794955609f0360be9781fafd59249b325413ac9fb9c4e59d2c9b28af4369a210",
    "signature": "0xcbd4ee06e74e30af1c802bdf4797a7bbcc67eadab88467d81e52806161f46b3b688931f772481b5725f8c03c74fae7ebf932c80c59f336ccf6a3d60e96f67ed31c",
    "signer": "0x92328BFDeD38C9a9De6E253A0CF5CB46A3B28611",
    "userId": "831117417"
  }
}