{
  "manageEntity": {
    "action": "Save",
    "entityId": "1204068258",
    "entityType": "Track",
    "nonce": "0xca40333216b6cfee0fa9ce9aac6e38e6c690fa1863ab0b66cae77224262cbe71",
    "signature": "0xc16119d2a5f53a9af7adfa1f55d5f6704675e98b591244b48b7173ca6a0180b3782d48be1ffef72c11c129290b9a191ba82ca3b6e584a575e66b35f117f589c11c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}