{
  "manageEntity": {
    "action": "Save",
    "entityId": "21735",
    "entityType": "Track",
    "nonce": "0x64c253cf9548943654c066c0eb8a8aed18cb6df8973799f2d5ede4b1fc69816b",
    "signature": "0x41d12e542af0e5d95a7f513faaa23d316ad81d7441d6d732c5fe0ccb159aa7351aaf2352daf3de8ab2cb4d2e9127b45ad84d0dc9bde1914bf84d069741b63da61b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}