{
  "manageEntity": {
    "action": "Save",
    "entityId": "28148",
    "entityType": "Track",
    "nonce": "0x61a02f8b71c958d3610690b1d57a11e252f9faed11025bc26123152655903999",
    "signature": "0x72cf30c404def1d8268d89eae3ac6a1ed664eb689feb24e4dc007eab16ab145a213bf106a6770074a392f80c9f9c5b5791f78751a83661d4ba04f2e68cad95001c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}