{
  "manageEntity": {
    "action": "Save",
    "entityId": "1370170102",
    "entityType": "Track",
    "nonce": "0x3bd799e862b9fffbca446a6c0828d9aa7f5a15a31f7a28f2946ee54d5eb8139f",
    "signature": "0xff5af364b8ca4b609d257202b8a50c18c7603127ad4f1f235d09d239cb33c5c8017bef0206022320cca428e4973f5bd4ffa5bfa2d2d0e4bd1a2d23565cb5102c1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}