{
  "manageEntity": {
    "action": "Save",
    "entityId": "858258486",
    "entityType": "Track",
    "nonce": "0x99f2569d3e442eebb358f78747a15d2692ba7e0c7d02e396b077930f667dcd58",
    "signature": "0x74ea10982f91f017e98f5d0b6f65abf001ae1d525a7a7b7d26f6b25475a6bc1632fc8563c46aeb2ced752dd422cb077b87d173978a6c1dbd2e0c62dec4b8bb421c",
    "signer": "0x80AAb49C8754361f9D9bCBBcdF58F48b88b58Ee7",
    "userId": "160381064"
  }
}