{
  "manageEntity": {
    "action": "Save",
    "entityId": "658507491",
    "entityType": "Track",
    "nonce": "0xf14639e17023ee61b9ddd56988067429904017c18b6eef6305183a209a8da44d",
    "signature": "0x5ffbf818b2fa9109b98198bb6dc11dc213bd596390aa53140db2c27dae76250001224dee3c6503538010b93df82a776146a5d95426e3b889908009bdae90f04d1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}