{
  "manageEntity": {
    "action": "Save",
    "entityId": "658529227",
    "entityType": "Track",
    "nonce": "0xf7d7db73572dd47c04af691ee82a0f6967b3c978ea7ae43f491dfb5a797bf4dc",
    "signature": "0xffc20b73c703f0f75615b9fcc0eaa2b02cf0cddfb955f9b9f521fd53374aeb2e22a7b16718c29f52363c04c8add81257e54704c2de215f82c86ed85b9bcb05151b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}