{
  "manageEntity": {
    "action": "Save",
    "entityId": "545433",
    "entityType": "Track",
    "nonce": "0x6dae059159105d41781dab12932f7a4ddc06f99ecf39fd3919b82d542cc48282",
    "signature": "0xca96cff0467a6b934467e97fc289596c6d62e33b2ec68a6c47369a8c2e53c61672eff5f3a578cebf371d34369540b3882d11e2e52b3bfc533564ff11870326ae1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}