{
  "manageEntity": {
    "action": "Save",
    "entityId": "1502716452",
    "entityType": "Track",
    "nonce": "0x617d02e43968b85b668e85ce7acfa367025ef6b9c2794706f970585fa746e5ce",
    "signature": "0xe1aef3621b076b9d633bc7d033786a95c95d8804b0404584cb321b03f7f0ac8e7e9e8b176e796c8fd11c73ca31c6d94129ad4282a2cb362d69622e8c4cce19b81c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}