{
  "manageEntity": {
    "action": "Save",
    "entityId": "1958544408",
    "entityType": "Track",
    "nonce": "0xce6fb525b1d1c7d0f244d0149245a5755a2eb803986f7557f0273f4f3f11d630",
    "signature": "0xcb8132647cbcf1a360cc4f237f2a75bbd8b13dcde48a5426172ea7b84fca9ee22f9cb426a13c6a72e770a508dd8d30de0ef8a01f912bb13c1d4df076c46a2f421c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}