{
  "manageEntity": {
    "action": "Save",
    "entityId": "689047458",
    "entityType": "Track",
    "nonce": "0x08362cc16117e8dece98abd3fa21d6c7be696124262ea385228578ee08f8b513",
    "signature": "0x7c1a4e978102a7f6fd0dcc8108afc4e9722154a17aec441469eed0685cf3435f59a8705ae399df8412192be7759cebbc5843ac6d075014ae76531ec9931f08e61b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}