{
  "manageEntity": {
    "action": "Save",
    "entityId": "1646754179",
    "entityType": "Track",
    "nonce": "0x38bae55239aa832e34f06803d3d1eda815c0070900df82f3d64e3b7d7c916abb",
    "signature": "0x2c00ddc875e91a5c61689ad928d368a455263f7571734226de1158d842b475df69c9722bd2ea99a35bc7ad8870d53dd5740c0611f5b0439690f8051b0c7465ea1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}