{
  "manageEntity": {
    "action": "Save",
    "entityId": "144948511",
    "entityType": "Track",
    "nonce": "0x4a6008297436790514c7fcd55ae883b605debb8d6c702429330ab911a3b41dbc",
    "signature": "0x2c9cb2fae231be7c54ddb50e91c8ab98d1280c65523f15e246bdaf1ba6c4dd5e4abb9d96d6f074c89b0e26547f8b65cab015b7fdf5ed93121bd962cb9af2d3d61c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}