{
  "manageEntity": {
    "action": "Save",
    "entityId": "1459474987",
    "entityType": "Track",
    "nonce": "0xd90269e25b9f87e57f5d91d237e0fa947d2118f566b499e286382e9758899d3f",
    "signature": "0x48823a3510bf7fe885413660f14833a3c234a47f24e9dc9e94425e5f8514b17d4c228a850ec500962f608fab471b9393f3ff4c52775642ba46c32d6ca07fa4601c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}