{
  "manageEntity": {
    "action": "Save",
    "entityId": "492150625",
    "entityType": "Track",
    "nonce": "0xa91c583fbe0d7204a68dcb9b5f9c0d897ee6eef0e6b7099d6afda6abd0b06254",
    "signature": "0x5917a4b5177227b4034d8f33a32b96a63d50531db10b14713e806129532ec67107b98832fbe1bb1cca13dba4c7d9309e3fcffcdf8ac8cccdac4e4181877766b81c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}