{
  "manageEntity": {
    "action": "Save",
    "entityId": "688577066",
    "entityType": "Track",
    "nonce": "0xbc889afec79b464c0f62b991183b44d672acda08f619a18db965891e96cc942e",
    "signature": "0x090ee2da679788248fa2735eb0f7c8252d3cbe1c8b6bc66513b8c63829a683f50245a3529904d32738cc86fffa314e3871ccbdac61644efe5a9689de49f0f8611c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}