{
  "manageEntity": {
    "action": "Save",
    "entityId": "4449226",
    "entityType": "Track",
    "nonce": "0xb4371a6cfeaddb8bffe2ca259abf913e668192901ef7572e5243280aaf45b3b6",
    "signature": "0xbd09a45a787040940fb1c9a8d28b45923d0dd744bcd885c9f8e498c37938c191541e353a7d9982c0a2796651212be07ab9842dac2f4293e008bbed9ccd7f31641b",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}