{
  "manageEntity": {
    "action": "Save",
    "entityId": "1964447136",
    "entityType": "Track",
    "nonce": "0xca17021c3810736bc156b1d8c53c51a7d354e2e7d0ffd354cbfac56a1d5842a2",
    "signature": "0x4503a72d94afceccf57f66093ea65fd7d2eeb17e9e9c97dc29f8588c75dab25c2ef002d99d982dc3ce63d8f7d02c0627ed46a8c9df8603e82a929e2cfb03a9c01c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}