{
  "manageEntity": {
    "action": "Save",
    "entityId": "472623779",
    "entityType": "Track",
    "nonce": "0x5304049f883aee90094ad64c884a3ba716ad63848003b1fa771893064121690b",
    "signature": "0x4606e4bdcf4ddfa5809660db8410b819948ad82785d03b294fa778e68b7410a10692313deefe17c0ae129a006bf71ccfc81ee5fe98116f4cbf18544bf9485e4d1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}