{
  "manageEntity": {
    "action": "Save",
    "entityId": "221402",
    "entityType": "Track",
    "nonce": "0x22c2fa94a3463bae8d587d154f0ebe5f7a536ba823335c36235fe1d2946b0d7d",
    "signature": "0xf6bebef34a67a371c786220e90225905de69a3a1442f644eae1fe6841e9a5dae6425b5502301d75e5f2fd1ec37ea3828261057d524b2a385df89aa039ef23ff11c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}