{
  "manageEntity": {
    "action": "Save",
    "entityId": "442820463",
    "entityType": "Track",
    "nonce": "0xf1f02ecc2804dd7fc04a468de30dc32b4072be8c1f094b28fca673aa2914910d",
    "signature": "0x125e8aeb81de3684e69fd5f49ec26258e9a63886a7c6f0e2d8ae412bd689a9955367eee483c3a062770cdeb0f6f6c17136b2492ab35df7fe292246d08120c4f01c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}