{
  "manageEntity": {
    "action": "Save",
    "entityId": "430892369",
    "entityType": "Track",
    "nonce": "0x370d3e45f0578eacdc02b338a5bdc4a8daea7058bd432265c0bc41596cd2dcd9",
    "signature": "0x3386884403b9360f49d58bbee47504868a731f3a9cb74eadc845baf2ab7f85b2719964700e3502c5e9c4160d914d56255c9a2ef443165ac51a268537a04de1001c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}