{
  "manageEntity": {
    "action": "Save",
    "entityId": "369745",
    "entityType": "Track",
    "nonce": "0x90eacaeb5ce751821e0e7e54ba9eada8d8190c7824507275e71290208ed55cc2",
    "signature": "0x70b6ed20e7743e2cb3e3127789845c031ca8419d13fa2e16b441ba900baca75237652230ba59e88c2742a612690e7d79ed7630bdef9a787cf446e101c0e9beb11b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}