{
  "manageEntity": {
    "action": "Save",
    "entityId": "219192488",
    "entityType": "Track",
    "nonce": "0x5e8cb7f233353e8d91d337083903af6d7ad6de95d069d79a89c56c6c565dee7c",
    "signature": "0x7b676d946e8824868cc457108131817f69be107fb95e63ec97e0b339239497db6f5ab7a991ce0ff12ab6c3bc8a16e43767e0fa27caea593d37cc3a6e9194f1761c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}