{
  "manageEntity": {
    "action": "Save",
    "entityId": "550349643",
    "entityType": "Track",
    "nonce": "1792675681343060963",
    "signature": "0xce6ee1d51ffd0c1a450d483c6654fb4d308a037182aee9851cfe1f6f407bc9b64ec1f19a701f6cebb9810dce73a652d251c86a3957cebe14956bf9a5873529801c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}