{
  "manageEntity": {
    "action": "Save",
    "entityId": "439926435",
    "entityType": "Track",
    "nonce": "0xb21f8abc06eaeab1793465539282192506a9e377ff2fe7804d594b0a26acd00d",
    "signature": "0x850040828a93367c6969e724980fea5ad85c149b51aa4a0da26e25ff289728ff06eebc7bccc90554750b4bd5c79e441760d1fe431bd0ce97d0efb40a9d9cd8ea1b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}