{
  "manageEntity": {
    "action": "Save",
    "entityId": "854775",
    "entityType": "Track",
    "nonce": "0x31a689a07d1206da1f9213ca7611b0ad25ebf26927e7d5e6a2c036c5c8fa6567",
    "signature": "0xcfc9ea377672db89ece21ed2f9d067dd1b3bb2a90c501b91bda09831e72490cd4357517f2d581e735767ac2ba24f895dc7a247538e7b7d2e93c909edb22df36f1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}