{
  "manageEntity": {
    "action": "Save",
    "entityId": "903583887",
    "entityType": "Track",
    "nonce": "0x2303e2a505eaa0d696b98ed015b28adbee37fbe11210bf1d273a198dd7af4dfa",
    "signature": "0xd188da3f8176b8fc8c12c20a6b6b195626ca289fbbc12a3e1fb7d885086b86b0636417381b41ba8f73784e9c2e5f1fa6fdaf9efce601fdb8eaa69de4b5f2632b1b",
    "signer": "0x85F59ae09C50C39DC9CE1660B0D49082C751ce0B",
    "userId": "162449215"
  }
}