{
  "manageEntity": {
    "action": "Save",
    "entityId": "516103172",
    "entityType": "Track",
    "nonce": "0x7fd207f2d47b93e4f106537dd81c062904d136f7c3cc529e6dc671c88ca2f8ad",
    "signature": "0x565c51a7dbda7975740d23351928b3ff95e301370cf994797b28722871d687a36b6e9c86f831f08f9d9ebc4ed0404028b8450112076983ea346e0cb27aa06cc01b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}