{
  "manageEntity": {
    "action": "Save",
    "entityId": "428396",
    "entityType": "Track",
    "nonce": "0x42080e2d3bfb913def415ce65dfad8419b712068ed27100574bd63c6755a8eed",
    "signature": "0x2156a120627c75533914ab24063e892380c6a053414ba39318cfc8ee88f3b48b3e171fcee1a70e92e3a92c21b4e5a3920e4e065d919252df914b516d1d8efd271b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}