{
  "manageEntity": {
    "action": "Save",
    "entityId": "404482011",
    "entityType": "Track",
    "nonce": "0x4baa4848eb847ccf41c7f37d8d32e10b082fa451d4187afdc7a5a04e3293c332",
    "signature": "0x4b31c52443d511a90f35e7c1e643a74ccce048cf3054fdecfcb78400628751be53f45d46c486c83e0f9bc674d0a5057410b4309a94ae0fc742796b0a53500c231b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}