{
  "manageEntity": {
    "action": "Save",
    "entityId": "183239423",
    "entityType": "Track",
    "nonce": "0xd0f304032e5c7e480297415924f2038ceda88ed409bde15146e408c0d5878f3f",
    "signature": "0x634ab95ab11b871bcc6f85948c388df3ef015b81ed69662ae0f6bbb64bf8b3454098d7c704892715a99dc2c3deb13e2672e6853742eda66dbcbc1888ec2854ba1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}