{
  "manageEntity": {
    "action": "Save",
    "entityId": "1519396410",
    "entityType": "Track",
    "nonce": "0x8302a0c4e9e569024360305002ee37fe50a47eda7b78d498080e666f584e37be",
    "signature": "0xe5e856b7d1b4453d67cb3875bf7547f9475bd2d81decca1a68d5e860165c0b1d7f590c6b3319b3f79af0c8a2fb2317e33ee7283a3e415b65ac6db9f322c2fd921b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}