{
  "manageEntity": {
    "action": "Save",
    "entityId": "537706239",
    "entityType": "Track",
    "nonce": "0x3e695f88512381e5a7b463ca71271d34dbec9e354fc029e4a45de9c0ace662ea",
    "signature": "0xe8eb39bb614dec8aae1bc627de5f1b2038ea48f61eb6f05557fd3439d27fbe8e4940bc0a105bf9fc387626c9473ef3a65fecc7612acb59ce9a0986b44ea8c1311c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}