{
  "manageEntity": {
    "action": "Save",
    "entityId": "1887963651",
    "entityType": "Track",
    "nonce": "0x7636777fda0f7bba963a3fa0bb73be290431a5f300c5f4828a17b14da92fc94d",
    "signature": "0x0565c834e7379ee30a5f964acfe48fbe2dd966b117cecc0f39067fd3291961057591fe7b1a64046c18c4017414bd1d797c5b2b8078de6d219d8d68c27f620aa11b",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}