{
  "manageEntity": {
    "action": "Save",
    "entityId": "263508870",
    "entityType": "Track",
    "nonce": "0xe533657a123823555d65e49cdd5af0173a0947238a49412e17cdb46b84c972e0",
    "signature": "0x8578c3e1577d24269a3f7c485025d170fac2d661e27f393534b7ccb580ce75433c760a357c1ea4bd00665077e7eed26dd1456a0f24ec04ed2aa8d67cf1868ddc1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}