{
  "manageEntity": {
    "action": "Save",
    "entityId": "805393455",
    "entityType": "Track",
    "nonce": "0x4e40fdb83e82a5c1e4b055ad5965c76ca1046d90c8840358dc059d6d120976f6",
    "signature": "0x1b0e1fe005feb578f8baf9213d93e502b5dd1e81d3363ce45772d2eaa2d52cd1609f2566fe511bcb8e534547a4ba56034b59d1354b40fa62559652db9313be921b",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}