{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554866529",
    "entityType": "Track",
    "nonce": "0x7b56c78eb9e5ee618fe4dc58ba28a5af6dfaac6a621a61368702fa7b265d5439",
    "signature": "0x12cf10e00750418a1da0ab7b095ac11b3563e44e15f82a27d5cf828e27f4e4c03fe6656c0136e4a2ce47eb4f3f267e798f4ae30c6a1ecbe5c9bd1ffb1d0bfaff1b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}