{
  "manageEntity": {
    "action": "Save",
    "entityId": "756452288",
    "entityType": "Track",
    "nonce": "1786482573579075083",
    "signature": "0x920da38926a5857784258ba711a246ff80de1fe464f00e618613df902356c0a451304637f48a81a991b6fa0af21ad7e0442339cb112c6d1f10712f059e7e01841b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}