{
  "manageEntity": {
    "action": "Save",
    "entityId": "728373",
    "entityType": "Track",
    "nonce": "0x4b30a339b9cc6af1fbd6a5b9a110831cee07042d7bf0fc919e3e5a687f3e2acc",
    "signature": "0x6457efc016d7dbb57f407edd6abc619831ad1ac551c06062301e207b79a522ff0cfbb4227303aab81f930ef4306ffd4f4f59f87ca4ff68ba1ab1fdc79abf7bbe1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}