{
  "manageEntity": {
    "action": "Save",
    "entityId": "1273490988",
    "entityType": "Track",
    "nonce": "0x503b112080400b61727447b49c3637bd7bb1ac9b3f767e8c43c35f4b9916deab",
    "signature": "0x1aab0d9ba55ffc444a1fa43b5324e5d9bea419a811dbe6a597e3b7a22774d7be749e885c2b05b970a97b8f0a48bc336931cbd9a831f7068de9bd621185a2d6f51b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}