{
  "manageEntity": {
    "action": "Save",
    "entityId": "664870119",
    "entityType": "Track",
    "nonce": "0x8aed6017603249d86b399451e1df0859c5856de090283d318792a1c3354b9364",
    "signature": "0x90d45b3fe961862ee29aa35ba01e2b82bcc60ad192cf4e5fbb636b9d1fd9a8b7340173ceeec2c892c156e1282552ae7700fcb8a2d1775fda51de25c44b3997d21c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}