{
  "manageEntity": {
    "action": "Save",
    "entityId": "291333079",
    "entityType": "Track",
    "nonce": "0x183043c2e55bc65bf88de588c081e0e506803fe08a3258e0e43a6f9b1433e402",
    "signature": "0xe7b3ae0a27b61191348992a904b60f9e2b36260353c3c87f62826b1a045daf0c1d37dff5c9d6396c231d638e91d556e1e6b9a2f73d71ef1f05ddbec642eeb8d01c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}