{
  "manageEntity": {
    "action": "Save",
    "entityId": "1872835149",
    "entityType": "Track",
    "nonce": "0x46336d72928c74e1e610fc7029d659dcd96774bde78cc7fe7b921d9f28b61b50",
    "signature": "0x4ac54c36b77e1aca65815c7e67fc324b5bb7c58dbefa6b4049e1ea0a433064a12470f88cae0fa750a8fe7511557204c9205f8c08f4e8ee775efa6d69b67c6f331c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}