{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303009116",
    "entityType": "Track",
    "nonce": "0xa57c199cf1ee10a7f6bfbec7808d034605ab4197a890151ea91193e6d580607b",
    "signature": "0x7c4ae8a214b7848a165cf77bf484e0403a70398eb8634f1964f6dd222e5e9e00775cc5ee55e68820352ba46de5668aa103976716345a2593f65a7cdb4c0c207a1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}