{
  "manageEntity": {
    "action": "Save",
    "entityId": "724369",
    "entityType": "Track",
    "nonce": "0x33aae6fedcc92290449f13422801e3136c90ff447c002dcc3dd8e8420ee48616",
    "signature": "0xb62f9016fe8a22bcd20afad429d1601c43e82ce871dc46ec366368703ca5b81527e1da5bad48399a09a9ef5add632d1a31804692081dfae68eea60b070b63e8a1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}