{
  "manageEntity": {
    "action": "Save",
    "entityId": "220818",
    "entityType": "Track",
    "nonce": "0x3a4c2e5f36190c6179c89f8bdfba321ee0179055c1cd7c1d7970b2a089cc6df3",
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    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}