{
  "manageEntity": {
    "action": "Save",
    "entityId": "1365161600",
    "entityType": "Track",
    "nonce": "0xa44188bbd4ca60ff5bc32d39ee6ebf64ae26b1d94651945f3f62d11862918844",
    "signature": "0xf19a1a10ddc4abdd3779f43c5741777762f10695ee98f3c8db0e41e72bdcccc664635c039f75c73778270c97285615c0493d87fa3cf48b1eb26ac1a2342fd5ed1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}