{
  "manageEntity": {
    "action": "Save",
    "entityId": "540260",
    "entityType": "Track",
    "nonce": "0xabbb64782103d3593fb961cb48366b3c0731ee1d7704502a299a43d62ead2e38",
    "signature": "0xaddb671f840466fa7d635515785ce0b906dc31968a61ec19d77990f4e3b6aeeb6e10e662a00a51eb4573db3c9461be9a0f373a22789830627c06d147c9a2f7801c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}