{
  "manageEntity": {
    "action": "Download",
    "entityId": "1640589129",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"city\":\"Taipei\",\"region\":\"Taiwan\",\"country\":\"Taiwan\"}}",
    "nonce": "0xe4041545ec3d4117c2ebed2eb2ccd22255d9483c6bf0bdd2926a0379d3693578",
    "signature": "0x29fd6e250985716844cbf587f2a4b183c0ad4d573283939f0508680fee042ea8564581c8885df87e924522217cd183f3649e8b95a14eac7f434d87a3a46e33e51c",
    "signer": "0x8adD917b209463A5C0F5deB4ca9AF44Fb119Dc9f",
    "userId": "162361300"
  }
}