{
  "manageEntity": {
    "action": "Save",
    "entityId": "687371850",
    "entityType": "Track",
    "nonce": "0x72bd3ff4270b5ec59127d9ec61184edd08651d9f701b534893285f73b9e7f1a5",
    "signature": "0x983fcca468f8883343b2cd45577660b3614f5753b59fd9b071d2ffc55bc7656b3be64ee44cebc6c3859ca5619ff2e2b529abaaff9f3a60beb33d9268907dba7e1b",
    "signer": "0x24844077bE6bb825c0548F36B4EFA030d05Ee1CD",
    "userId": "601282125"
  }
}