{
  "manageEntity": {
    "action": "Save",
    "entityId": "957248473",
    "entityType": "Track",
    "nonce": "0x3630811ad7d4275eca4f851b1f682aee09806d27331ede7aefce021bc90d1182",
    "signature": "0xc25737db8e315d809df0c0974d6f7c13d5d72e2d8b7dbb0a0b87b720fec9272c1be8fe5240af907441a646a8317b5e1ccac18d8b8e64f67e1c7a82e24613dc901b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}