{
  "manageEntity": {
    "action": "Save",
    "entityId": "923975548",
    "entityType": "Track",
    "nonce": "0x4e8a3322c278348cd191ec5e151be229ed0b07861f32d418bdf1d780550400d3",
    "signature": "0x44c1859dad32c9d884fae378b5c4b46c1397deb09d463b632ed70849cce001f47719a2e33cd6424aba8301f636e8e5c4aa98a9d47a12a189bd06756218b21a901b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}