{
  "manageEntity": {
    "action": "Save",
    "entityId": "480252",
    "entityType": "Track",
    "nonce": "0x42c4f7f94b45a71b16486b3afe58ecde39012170a2681199cbd79c54dc3767da",
    "signature": "0x880774d2ab0334d0fac818c7fadc00203d63f2525168d21f0bd535af7c9a577f758eee122b7cc10a6995fba57f37b3cbf9e092cc4647c87ed58990d0820424691c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}