{
  "manageEntity": {
    "action": "Save",
    "entityId": "1345133864",
    "entityType": "Track",
    "nonce": "0x53566954a5e4e3dcf51f25f6d2e46c91e6421c827946ea955b8bbb76b5c72e2f",
    "signature": "0x299d3869dc30b3a720d5259f61cf9bcff6fee5eb5a7b9186e3a4d7afb475a3f72b8fe1530a4d942861080e9df6d01e4ab94f5b8f0a71462aec67039e847f17b51b",
    "signer": "0xE7A4a8f1d081B44C96Ed68610B6c3016ce8cD6E0",
    "userId": "464427506"
  }
}