{
  "manageEntity": {
    "action": "Save",
    "entityId": "1589564338",
    "entityType": "Track",
    "nonce": "0xb76080decf17d8ec4886f42d9a6cee4cc29838641ca507ddaa2e809ec3973041",
    "signature": "0xee35abbf4143638446ded2c21a2b4ae7ddd5146f694b69c794542ff83db2a2de3728af836ee9ea5e591ea7d0dd96bffe3567006dbbffaa55de74c75fe512df611c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}