{
  "manageEntity": {
    "action": "Save",
    "entityId": "446014706",
    "entityType": "Track",
    "nonce": "0x16fc2ec6c51ca51bcb0eacb20a6e4282dafcb3285a3566564e6407f3fe387d4d",
    "signature": "0x828ac341594e9f7e410e44a5949a52c2b3ce953a147ff61624cb71281de487352b645e484472db6c07928dd1c62f203a426fa65279b4f322e47630dbdcd39db51b",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}