{
  "manageEntity": {
    "action": "Save",
    "entityId": "570405315",
    "entityType": "Track",
    "nonce": "0x547768adfcc7ca39dc6774fa765579f0c4fb3e0b50c41858321fcb60727fa418",
    "signature": "0xe5bb5af9dc0f8fdd5c6b8436ab53c1feb3cc94ef7e81159d1ad9642f127d0d514be0293b11a2fbbf0538b70eb4caae2f1f503d8ccceb0431b0cf5621b06ea5281c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}