{
  "manageEntity": {
    "action": "Save",
    "entityId": "421047",
    "entityType": "Track",
    "nonce": "0x18ca51836472c5bb12172310efd3d814910b3d6a2a3db058de943ac9a8e619f8",
    "signature": "0x4b5f9a1718849cef2e0bef0ddd939a6be5e4d9e2b4b5081a426d83de540104ad6a7cd6193d082a9b83b178cc75acd54e968df36f4624a3cbb52e7a76c4c4270a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}