{
  "manageEntity": {
    "action": "Save",
    "entityId": "1854944736",
    "entityType": "Track",
    "nonce": "0x834685c82c186a2a0fd72e2fc2584072803b44ce94f85b29eb503eeb56300ff5",
    "signature": "0xb04e48c92e0851a2a5d3e2f43f9a05b604855ce064cfb037b49f4b1642a752dd2197857037ef7a50955e9a7b8d881284f1afd85a034e9998b7b86c9e33082ba61c",
    "signer": "0x5c51216FbbB9B7A562f11267f91f72A7be1e8DE3",
    "userId": "301637"
  }
}