{
  "manageEntity": {
    "action": "Save",
    "entityId": "767605987",
    "entityType": "Track",
    "nonce": "0x9d279647bdcba5737c1a8e1281f535508498cae01f4a9e6529aaaaeb9a798860",
    "signature": "0x693a50befec76960e8b54ee1cce28f28584f8f2b8e6dad416d8cdc1d256f1ee248c022e537425b912722778cfa4e164db8eb6062a2bd2622faffc76388006e511c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}