{
  "manageEntity": {
    "action": "Save",
    "entityId": "389752393",
    "entityType": "Track",
    "nonce": "1792068722894985411",
    "signature": "0x5dddeb3a9bcf359529e11043b0239345b98c6c42688701f561df96e8aa8099704f5cc678361b424047a79ba84ab1f841534db4b442105822f3f8efd3983d8b611c",
    "signer": "0x23dF8876fD80368D375d911e3CbDFd15B8e85CB5",
    "userId": "827420993"
  }
}