{
  "manageEntity": {
    "action": "Save",
    "entityId": "210805538",
    "entityType": "Track",
    "nonce": "0x2a2b8ea396fa95b9e3f601ddc51004a430fcfdb4b2a7081f367ebb7eb4f3e040",
    "signature": "0xb49149d1f16813b05b88f87052f06b9d342195f2328533e6cd4225ebc434e1901ad179c56b45b3b4ba139dbc72a7b2e3e380af4e132454c9ebdb2477d89b3e181b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}