{
  "manageEntity": {
    "action": "Save",
    "entityId": "544487",
    "entityType": "Track",
    "nonce": "0xd9605f9712e4d734e125a00ae23f29e8e02e8b32b0b857952902eac4831294f0",
    "signature": "0x4d2b03ac52e30677cc98a9d690138ee4cae877594f5768522ebc31aca53fac3a1b70c5264a8482dbfcc51d79ddaaa0e148ed31a66a56e65d4a9892f685c21ee31c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}