{
  "manageEntity": {
    "action": "Save",
    "entityId": "1537309719",
    "entityType": "Track",
    "nonce": "0xaaf7e482fb6dfe04844bbbe0ee7d87a234517f329f8ff82bfdab611ed3673a6b",
    "signature": "0xf24f9e3929f3941796afec1bd0d845bb07c7805ac0d9a1a5ba9be3b5740595396868ad842c36bfd95ccf445167031ddb69664f182ff168b562fa75870caeca841b",
    "signer": "0x14d7618B82Da4e7176FDe32e4379943eCd69798D",
    "userId": "238125623"
  }
}