{
  "manageEntity": {
    "action": "Save",
    "entityId": "974049087",
    "entityType": "Track",
    "nonce": "0x72402298106e939bc47d79f88b92838bea5ef77051a1a2799e45cfde1fa7f1e5",
    "signature": "0xe5074d709dfa28def0d015fd68ea8daf6d53c86b9393a15da1e66652e8b689ca4360530833a6284e1f01b7066165ad219271dff0d958559e7794481ffec945dc1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}