{
  "manageEntity": {
    "action": "Save",
    "entityId": "1637136909",
    "entityType": "Track",
    "nonce": "0xfc0c338e6d58cd0b4374564a6ca01bf2853443b5b6461fcae7e00a253d6e5fb8",
    "signature": "0x8f271c34fc514d540ed2433223bbc6503de375b1a8402070111289874e74bbe948ba64fe863c04a5c33f3ab6641e4990a4a533eb0441ea626a597a17d30243cd1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}