{
  "manageEntity": {
    "action": "Save",
    "entityId": "684481495",
    "entityType": "Track",
    "nonce": "0xa8c1620741700ec89094d9391477eb2788f35bc19a90bfa218287661ff264a9c",
    "signature": "0x50f4c21653c603ddec365db26091bad17ccf83435e41495f51fd58522f255b7e5483f0f67ddb567170e147f6504b3c6b3be5e2a4d506d08a8f28a9c41eef4d661b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}