{
  "manageEntity": {
    "action": "Save",
    "entityId": "4790455",
    "entityType": "Track",
    "nonce": "0x279f2816e5cae19865d4025974f8b976c3f6b0136bdad0e1108c65fc72fd3f0a",
    "signature": "0xd2e8185fdef324be7cd838553ed61da358b932c068223b663ff15036da7d209d3d9e157f56526e051e0001ffb5cce067e8df3783af3b61b5eb5ebf107f37fa6b1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}