{
  "manageEntity": {
    "action": "Save",
    "entityId": "677369539",
    "entityType": "Track",
    "nonce": "0xd751187378c7516ebfa7816ea4d2e360fa2116c27231c5db67845e5d5aea7cb7",
    "signature": "0xd6bbd4beb50a3201b38ba56e95cf1e80a498d7a89afb23462579559accba059461571531a980e14de8f4cd451441abe12a9f11c907be9dba6a1f0b2d3948fc0b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}