{
  "manageEntity": {
    "action": "Save",
    "entityId": "491320875",
    "entityType": "Track",
    "nonce": "0xdbf17b36c36109b9824c73f409a13b1f9480b5db3a92381bec8d3397b5d0de6c",
    "signature": "0xcd51fe52ff1bc8fa97a1a2ac1c50d7a4b50cdd1bbaf38ab9cf528a88ae4d600a2b80a0f96da469c808274bab1755a83e57c7fb2bc5b9750acbd1dde14f8cce521c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}