{
  "manageEntity": {
    "action": "Save",
    "entityId": "815487271",
    "entityType": "Track",
    "nonce": "0xd536cb56e2a2830f54a1817d4f219c64226f53aaf5018ee1f4ae819a9cd004fe",
    "signature": "0xb120b23234072998b4437f2972dda74656c6babb90e237be32eb568cc794ec5d681c352d80426d70812453d52e88fe8c4e358a0e6cd5131d54fb9a27cc55cd921c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}