{
  "manageEntity": {
    "action": "Save",
    "entityId": "755679384",
    "entityType": "Track",
    "nonce": "0x98919a38260493a4e59f0c6132c77b39d336dfe347c62cb2659c5dfea901a798",
    "signature": "0xd3799faf807af83c6762b76247ae77f0365a39a7f987222083b8b638b00d38733eb3f97f8cbca5c78a3eddf01d978aec40599f08bf8430219233e1da78c5b9cb1b",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}