{
  "manageEntity": {
    "action": "Save",
    "entityId": "1591717273",
    "entityType": "Track",
    "nonce": "0x7e5bdc6321a1d0f82bdb936d7608eff61c6fc4b6da8d06a6a7ffcaff786aeff2",
    "signature": "0x454be05fd1334f006bf0f282a0555f4ac37dbc4a7a6deb643539f47f80d5de8b545280b53cffe5a5c3f9ab1b1240dc18a959acd93ce36b2ffac0f15c70834e351b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}