{
  "manageEntity": {
    "action": "Save",
    "entityId": "433787489",
    "entityType": "Track",
    "nonce": "0x3c623a6bdaa8b2d51624c965daa9c71adfadb3f38eb914587567b6f8ec34fb78",
    "signature": "0xc8d89d36f33994b0ce62be297bfcf6b86e12cc6ef68ae72cb3b192e6e81027df6426b1aa790c059de5f915582d04dc1a642643e51b8c75ab73ed3ab18ccff7ce1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}