{
  "manageEntity": {
    "action": "Save",
    "entityId": "322298",
    "entityType": "Track",
    "nonce": "0x1b4bc128fd4cdf7ca5ba55f2e67e47bfae749ad1551f09b39fc00e5d7020a408",
    "signature": "0x03873546cef2e57c6f23880fd321bce4f75a8cfd44413c4fefe4ab1d900ad89e2b74ae52a4ff8b5b38e09c68d3734dc7d4570124bbd1d3f6ab7112412f5a2f911c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}