{
  "manageEntity": {
    "action": "Save",
    "entityId": "425219005",
    "entityType": "Track",
    "nonce": "0x938d2e1ee19d0ac608d07dabc2b6f0a57eded55443d95d8f2f4e5ae49f7823f2",
    "signature": "0x7b1b85453d1ef69c54daffc918b0e5bb3c720ad18ace4b317478466e19cda66c107c1944172e7a19b586ac01289a6d46c9c094162914932eb504fe9d28208cf71b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}