{
  "manageEntity": {
    "action": "Save",
    "entityId": "2107939855",
    "entityType": "Track",
    "nonce": "0x2ef5d5081dfd291ee349e3dd91a55c3974554d2ff538edd231332214a840409f",
    "signature": "0x44d4e79103936de92f547096eac909ed67f84061847099a4f6477e13af832b1800b7ba1533ba43605e7a7ab6006306e090ae39cd8919839291076d0b3bda5d291b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}