{
  "manageEntity": {
    "action": "Save",
    "entityId": "390210",
    "entityType": "Track",
    "nonce": "0x55c891ab180b9beaf426dac2f42a29a5e84fda69578add43984341b0cef6afbc",
    "signature": "0xb1d3645466a1360a28a20ea3a8a32d8bda24e7f2b056c82009ce15fc731a7f0974c1a647897c2f2e87558e796e28ed294024375711237f8a9be1b5353028d1741b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}