{
  "manageEntity": {
    "action": "Save",
    "entityId": "250872",
    "entityType": "Track",
    "nonce": "0x5bc67e35e13f271cee65c017ae22ebfa78f97bfdff80a6108c4524147988d689",
    "signature": "0xaae11b31500c78aa7d0ea53993ab0e9cbf3afbc67873c512564b5bd8492b038970a4dd6e67e6edfe3887b4855f80b0d259dcb230da5e11083012cf6251ac8e221b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}