{
  "manageEntity": {
    "action": "Save",
    "entityId": "261040937",
    "entityType": "Track",
    "nonce": "0x1f6c71f07c2faab9bba06a239b09ae8334902387a766128a1747509985a0e174",
    "signature": "0x3b6710ab9b0250ed2d69893012324b03dae5a94cb8a9ae803e1c560a51b8bc2a641ef80233f69838281d2d3457b2dc30ba42ec34b1fbffbc921ecfd0d39847e11b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}