{
  "manageEntity": {
    "action": "Save",
    "entityId": "72470324",
    "entityType": "Track",
    "nonce": "0x309a5d88e3a04fc068cd194217e5afc71c51baaf7a107d3b1b28a25a9508bdd9",
    "signature": "0x907002ca1cd7bb53f4e88f5ad598bcf96f8659437a23ce743ef5b66fd7348fc55141976008be0a3db4203310213bb0b45d6053cc0fb22842f1feed0582e413751b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}