{
  "manageEntity": {
    "action": "Save",
    "entityId": "252465027",
    "entityType": "Track",
    "nonce": "1790151578590707603",
    "signature": "0x61bc7f51d85ef0b992473ebd0e9f5fd4826d32f073f3b86e3bcc9b85e3836f16296f6e9f6f7b9f58dc0317a7722621cec131e33fa2ea9ea846e33b1c363790bc1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}