{
  "manageEntity": {
    "action": "Save",
    "entityId": "144569951",
    "entityType": "Track",
    "nonce": "0x1fefec92b2a1093936d96a67bd247ee934399ccbfa27f8d6d61eb8b4a23514f7",
    "signature": "0xad9d12bdddb017cff19f7b88a668c955458766f7bb1d4e94069ed73fdd9ab7907b2a198ea93b2e383f84ab5c493da79e7b3034593a1155252cac5167586858c51b",
    "signer": "0x1642AB480EAD0cea9776277347Cbd3e5Fe9889f6",
    "userId": "711757920"
  }
}