{
  "manageEntity": {
    "action": "Save",
    "entityId": "74173689",
    "entityType": "Track",
    "nonce": "0x72c00c015ac2af7addb14e4a8bd7422ffda1c9cf8900f7ce996dbf6d240e4beb",
    "signature": "0xc5fcbf4003c112fc1eedef40c78f6f1883a421a52a5e85a13a1f320ef1c76d1b6a6421751deb54bf7d23ce6c038e5ddc7d381998a864b4d13f440c981d4ab8f11c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}