{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564198557",
    "entityType": "Track",
    "nonce": "0x60f7907926880c3df8a37c92560d2b318980061e40817695131812168fb4222d",
    "signature": "0x45f5f54494e03a7af1b6ac79a01325ab3a2dda0a201ecad2a97dc2ffe5844be423080d393e2e55c1348f8c4d94b806664a38a233fc35c3e31db44c13043eec8a1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}