{
  "manageEntity": {
    "action": "Save",
    "entityId": "305294393",
    "entityType": "Track",
    "nonce": "0xd376e4585f7485e0bc7ee38ea65e3917c3451c3b22451ef17048d31becbec0b4",
    "signature": "0x540c5d6d69517484a816f0fcb228ab1f9ddef6daf1f9b5fcac0e65b391566ff27b0ce0af41572bf4e7c78d2fee78e268d62de58f53b3677337a1764a8d75eee81b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}