{
  "manageEntity": {
    "action": "Save",
    "entityId": "1643951333",
    "entityType": "Track",
    "nonce": "0xbd41cf4a9d27f12449a0a1b57d36e41dd308fc4bc8500ac3f466d30dfc7fb94f",
    "signature": "0x5075db20fff0635d1dde4dc97c69595e650dd7a7372a06f20c2b05f1b0ba19192ec88f484e97d0fd96d116b4b8736c627f34cf013219f835dcb1ab395c5306151c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}