{
  "manageEntity": {
    "action": "Save",
    "entityId": "752387872",
    "entityType": "Track",
    "nonce": "0x357ec264801192c48486fe386ca9de8f8c2e0a27ab06ff1a8a0953a5fe291a39",
    "signature": "0x6c05d6dc69248f7e9602ba5f2ba67393b7d7b7b98937a0ea5654ed13e455b27d5a3701742ee7953e24d2c0b1182c8b703929be005a947abbac056977467c4be71c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}