{
  "manageEntity": {
    "action": "Save",
    "entityId": "899936699",
    "entityType": "Track",
    "nonce": "0x42744d684b32cc0848a04883c20888b32ec8d56f1dad618a569d12f43b2b2ee8",
    "signature": "0x46b136dba2fe8b50de80fd9f8a0993704149f1a48bb9637853a10baaade6ca1e361817eac4733b96d6492ce6344f439bb8430d8b1ef33012a04bb6e914291cfd1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}