{
  "manageEntity": {
    "action": "Save",
    "entityId": "903774590",
    "entityType": "Track",
    "nonce": "0x60c3f4e55c8a882f908a136d3c52aef91ec3b24ccd62d346e8eb7abf69ca9be2",
    "signature": "0x8e6f1fbb70c01b5901bb6cc0e7c2e1303041d1d1e832cb0c786db2e6fa94cb9b76850d1a176ba1b0a1d8fae40a480774597faef4a6023ffee43a44c44c28264f1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}