{
  "manageEntity": {
    "action": "Save",
    "entityId": "403995661",
    "entityType": "Track",
    "nonce": "0x0ce6003cc3fc890fe69edfab3c51563903639743b604804be866a8d1e768cfae",
    "signature": "0xec5045d84713aff33a8ab74d618f494c7317fb08ba583c62b29eba3b43c4e3371e7a86f57295fb59467e75834bd925f68626a325fdce15114a4e6118fee90b251c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}