{
  "manageEntity": {
    "action": "Save",
    "entityId": "778342864",
    "entityType": "Track",
    "nonce": "0x431bc15e792b3f1e23218f0b9e9558f6e618162c03fbe857daa636daf802a282",
    "signature": "0xc712d33eb5de3bc3d615586b737ba9aa0b3d19f88a6927409a60738d7854bf477d65ac8798918b2160d563578ca590ba6e13a4ceb9791a98f124ec276667e58c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}