{
  "manageEntity": {
    "action": "Save",
    "entityId": "949608",
    "entityType": "Track",
    "nonce": "0x1611ee2a87e034964242f0afcc8cdf3688f9962347bc3bf3f27516249d24cde1",
    "signature": "0x770ce749829fe77fc3e4b52aa5bd8d201b938daa979587fabdc5f24a1a674bbc7c27814d296f39e7a45ab375f96963c9f7d121fb094c91bbc0a63ac09012512f1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}