{
  "manageEntity": {
    "action": "Save",
    "entityId": "303018406",
    "entityType": "Track",
    "nonce": "0xd258e9b0d3ce1da757d0e75add2d4182d0339e10f02942db28d6365a6c0ffcba",
    "signature": "0x754751a0c702977bd1d241dd124de6421279cbe5f3929bcc384f500db0b6a16412e30d81ff2d158ae69762f45c7c9ae93f7011bd4f268b0f2fe39f727bcc58f71b",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}