{
  "manageEntity": {
    "action": "Save",
    "entityId": "1894740796",
    "entityType": "Track",
    "nonce": "0x8b5c3d5c863a9d0c77c3b92652ba9cdc03377735c178e4f2ece631855a0da077",
    "signature": "0x20e9f5b41e64660d61e40fbd29d97124f54ddf0ada911d42b8d4796c43a54f610f5df52cd75848e689816566e66e49f3047a1cbb2dec3ef71804d427c2998f191b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}