{
  "manageEntity": {
    "action": "Save",
    "entityId": "854783",
    "entityType": "Track",
    "nonce": "0xfeae94aa160c716fdece4dda9eabdcd92dacc2325a8af010c4aefb9f14f3fcc8",
    "signature": "0x3c2d7c9c60e6bbc2d96a7dd09f0c92061d84322a087b309a2b0a9901d6d09aaf7369eb80c93fd416fda3c53d5a3ff24c580c442bb33aa205119ff4387ee1aacb1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}