{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564855223",
    "entityType": "Track",
    "nonce": "0x6149859c33f361d3e520634fae35ff3eb23d2aad8d8f5066f5c07c64b64a0eac",
    "signature": "0xd91acf148e4576553ed9b78484e74f13c60dcd5dc789d60315bcdc71f308df5544cf103539455bdb93c541ddca689b72b0c5399c04b71ffb10792aacdc126cd21c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}