{
  "manageEntity": {
    "action": "Save",
    "entityId": "538506009",
    "entityType": "Track",
    "nonce": "0x42d80f1eaf15e31a322b1e83ff72611144d1efd422b2c7baf347fc6042ca5821",
    "signature": "0xb8f6c59e93814ab5f1c9ed22fbb4709c717350ad19f87903d5a8f77d409245a83aab7d24d1e6ad73ab6a3b7cb04b36c9c70a1954c76b2acc2896522d6f88c5b21c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}