{
  "manageEntity": {
    "action": "Save",
    "entityId": "1355749914",
    "entityType": "Track",
    "nonce": "0x5cdbf574da287cb7a55e5dd55017a926fc92a2c4224aec534a649b8d625b4d7b",
    "signature": "0x28d84bc19cfb02eead3f659c2d311024344a83cb000ef169b76bd6cc5f5701d34729f878c9b48b91d7b2452fdcaea6a56f6732217dd9862dcf605d14e26e5ea11c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}