{
  "manageEntity": {
    "action": "Save",
    "entityId": "43178",
    "entityType": "Track",
    "nonce": "0xf2178add026a10c3d439cf47e111ae6196130dd5805ae69e2cec72ea7da7a840",
    "signature": "0xcb3b6e1ed70436dca0dfc5de2da7d60b8cfa3525f6997ed02ef48d71eceeed484cf4ee34c72ba4ac8be5c16b7e7f9aeeef2b90c064a220c26fc0a86457fcfbd61c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}