{
  "manageEntity": {
    "action": "Save",
    "entityId": "1978678386",
    "entityType": "Track",
    "nonce": "0x41b67abf655852a6f12e26596e19858b6433c0eeec1c4bf6b592dcb749abed12",
    "signature": "0xca5ae29b0eb84cc739e8559477d272e9e7540c3f32a9b26ac53763dbefc8aa2e73f070a5ed4eca80998472f01223ebfd4e27ace04ee1cf2fbd82dc323dc08b071b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}