{
  "manageEntity": {
    "action": "Save",
    "entityId": "294542298",
    "entityType": "Track",
    "nonce": "0x40f0979a9f2132955348623cf07ba2090def97bad7374a878407adcfa748a2a6",
    "signature": "0x48af36e3481605393aebf2e0ba2f7f3207278683d349ca1c807904c745b1d24e6619115ba521013ead4451c307d66782cea3d149bbf6a3b35f72d8b2efc0a3e81c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}