{
  "manageEntity": {
    "action": "Save",
    "entityId": "707448493",
    "entityType": "Track",
    "nonce": "0x4a4331d61ba83e04fb7362b738476218a5159147f752a4409bb870130518fad6",
    "signature": "0xbec0e9a25c73f4c7ad1934913471701b0d3c363028c3f25db72d2ef77b70f8912fffe6cd3bd04bab54fea476c148fb0628ea9ff1394733f2866fed79000880131c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}