{
  "manageEntity": {
    "action": "Save",
    "entityId": "1390290205",
    "entityType": "Track",
    "nonce": "0x5f5fed25d1febd19622ed881761dd7976b4c8e80f60174cca22a0bd295f7d4d7",
    "signature": "0x747cd15a199a9ce732e019965ccc1d9ce0153ad7710f8433afb42118cded931d7f3b8773c7e0886fa1490b025584633c0b0d809b18cefc6d47c12f9666e935e91c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}