{
  "manageEntity": {
    "action": "Save",
    "entityId": "575049490",
    "entityType": "Track",
    "nonce": "0x61d3822c47af61dee8c6f627684f8b266786861b663c6afad24c303a86fc1587",
    "signature": "0x12762600c4f1cece6eb85aa1bfdceb0d24b795fd15c361b60c545be7f42c6ea50cf45cad705b84e1c22930bf7919412978c24f5ae03a1e0d99b4dbba56b4b6f31b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}