{
  "manageEntity": {
    "action": "Save",
    "entityId": "405623127",
    "entityType": "Track",
    "nonce": "0x76cb7d465ec90a9a14db3c9e8bf682ab413fa96296a838e741ff0457675f898b",
    "signature": "0x0ad3c0cf365ac9ae125df301ad4ecb4c2ae16f6219e65f335bd89c57500f6bf217576d0caf44532283399c718c633508d4b651910965d65aaf4730d59c755f4f1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}