{
  "manageEntity": {
    "action": "Save",
    "entityId": "887598522",
    "entityType": "Track",
    "nonce": "1789918139828993671",
    "signature": "0x30902baa084aab8e593903624fb8722b7372fe26dc6af80d1dc7470030353ebf2e235daf0ff7617636b7c523984b463f2ac387fff131e7761e3dbc55c7d30c021c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}