{
  "manageEntity": {
    "action": "Save",
    "entityId": "245893229",
    "entityType": "Track",
    "nonce": "0x639b7afb2112f15e3e58d7daf6d81395ab718cc9d34c10c622265256e2d83144",
    "signature": "0x88ff2166abaddbfa6355d7b6d59c9a6aadbbdfcf0220f81ea2d690233d64f09b6f7d74396204258d7912b2e03efcdba5eceabf3b963d139d2ba531ef76b065b91b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}