{
  "manageEntity": {
    "action": "Save",
    "entityId": "258497",
    "entityType": "Track",
    "nonce": "0xcbaa43d54daeb83ec3fa97c7bc898ef514626a961e425e7a579309791230fbe5",
    "signature": "0xa86d3e60bb3728fe4527c2e0a6258ebdebc01670337decb6af10150bdb238e332ea5f2a5365d026f1c362c0b323b242bb8e9013ef784f85e509626d4b27f07f11b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}