{
  "manageEntity": {
    "action": "Save",
    "entityId": "820673471",
    "entityType": "Track",
    "nonce": "0xc8acca8e3c50de8a728de52b01eb4ab09fe02513b0907a3886337d7cc00fb884",
    "signature": "0xeab1d00a255c066d05d2acf7e3a0d41fa3636e5b6e9a837a36e8142c7c1690ec7819f01a0d89aded622a014904c2e9b68a2b3f90b9b5a8998be9ebe5a80097981b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}