{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990494978",
    "entityType": "Track",
    "nonce": "0x9f5ad63b3b7a20572491f509da547039d8610e73a5c14e8673ab3f362500a01c",
    "signature": "0xca963d0528deb0e36415d674ed778c99d7a6e1042eb307808b4929c559d68481054d07fec3e2ce884cff1b0c282cf4bb880d60d14972c450361d628ac09132211c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}