{
  "manageEntity": {
    "action": "Save",
    "entityId": "569796450",
    "entityType": "Track",
    "nonce": "0xe6ad3c51cb88dc699afca2fe96daeb61fc45ff3e4d9d2fe587da473c59f88a88",
    "signature": "0x822133e5a660d49b02a77c162e0c72eff75f35d17433b62cb53008990619f771090f9f92cd41af27ee21f032697b40aa1c2dd26e0f653a603858b2497ef355541c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}