{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904718683",
    "entityType": "Track",
    "nonce": "0xa144aca10a9e696556e87db98f10f271e7027644908e11d69e775c79e726c09a",
    "signature": "0xd8c39c9ec24ee8661351b406cb7d0a56b9235e30f18994f06223a2c6153ff28825062420c99a7324e51a6dba0f3cb915dc757697abbb518e608ac52c2f834f791c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}