{
  "manageEntity": {
    "action": "Save",
    "entityId": "142775029",
    "entityType": "Track",
    "nonce": "0x948f0adbc7749f56fc14f2e0cbbe69b2a3e18d1be2759259f6903b393a04e395",
    "signature": "0x55c37c17c3e8083bec760ef2801c5011e9fcf45768ab5d9573050f7b3e8c3d0310b50a7450e953d2a73379cd4463c069b8de74d074a29ee5f63990286b6a45511b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}