{
  "manageEntity": {
    "action": "Save",
    "entityId": "567983919",
    "entityType": "Track",
    "nonce": "0x66e7fbd5239cf257d563e906f1e52e37e64210e2cd442aa122c2f67f174a7c02",
    "signature": "0xd5631ec7e7ce6a403fa5c6535496dbceec50cef194f49f091e508f5e1737bba73f7f6f70f1176ac508aeca8bb8d5bab65575c1ca814c8e9e46efc21eca43042a1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}