{
  "manageEntity": {
    "action": "Save",
    "entityId": "284801090",
    "entityType": "Track",
    "nonce": "0x3c038fe95d4990317d1368f7c39d0b10b281d8248536fd505a9bc955553263c9",
    "signature": "0xf4000b723b3ff624dae4f5ea7751634f1f7a8919a652aff5e90a0de222ec14a078d2a3bd9a3fb49f51ff16e03395179d111a1ec8a16f7b80afcd9f970aef471e1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}