{
  "manageEntity": {
    "action": "Save",
    "entityId": "456754",
    "entityType": "Track",
    "nonce": "0x27e4176c91e492eaf6a0dfa623088cea1263be17a6f4643a1c7b9c450763f2a3",
    "signature": "0x062f04586e38d5de4dc145b8e4f28d84568a028f7ee6e4cab37d6e91d5b17c8922e30bfdbe10f3e270826aa44067e8b3dc00da525d59d4b01f8bd38cb27d0a1e1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}