{
  "manageEntity": {
    "action": "Save",
    "entityId": "1666469057",
    "entityType": "Track",
    "nonce": "0x5d8a628dfe8a222e8a210533d4c2e40d7afa2b223b6f3ff2ecac8a0b7590b2fa",
    "signature": "0xe3495cfc6ac9e86defc0ea7baaba4137f1a4f859ac06642752037c562ca3800c61298a3ec2e4be528c6928ca8b92c7abc87a21c7874d6f3aa094a20982da249c1b",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}