{
  "manageEntity": {
    "action": "Save",
    "entityId": "919451",
    "entityType": "Track",
    "nonce": "0x9d7076a8b3ead47fe733bba8ebdf2f082314af3f544630452822a018d7d3e404",
    "signature": "0x08518005fb398c2b5b58c6434ae45c4b57f80fc68393937b090b1705821abccb19ae95cbcd56b80246feda015d35634da98b454ce17956f5b12e28c903c25d801c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}