{
  "manageEntity": {
    "action": "Save",
    "entityId": "487559",
    "entityType": "Track",
    "nonce": "0x38f02d3c8fedc329f8b0fc2ba8ff41d2a81ae25ea1c8d51e99682fc784e4d397",
    "signature": "0xb4b150e47f5e5bad9856b621c870dd73df580cf2018c3e871737938158ada886080b9192fb13495c7c5cadfabf0ea5a212e6bba6b3fb2b049daee2be8a3dcb2e1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}