{
  "manageEntity": {
    "action": "Save",
    "entityId": "1650912997",
    "entityType": "Track",
    "nonce": "0x65ce654f72f1df5b91a68400d249e2cac3a6d49d340b1d5bc0976d83e971620c",
    "signature": "0x7c4bdd148280206f638453ee20e1863c713d8434300ef13b166e511be9a1d84275b3951ca1af7dfe9a2a2d62217b893c39733959c9d65f2c91b116e24c0fc7221c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}