{
  "manageEntity": {
    "action": "Save",
    "entityId": "328638",
    "entityType": "Track",
    "nonce": "0x3f524790e9b296fc0eabb379620cee98407e2ddfdc2327b59f8c85d16952fbc0",
    "signature": "0xe414a5212aa1c46f1cd49829ca6c802e207bfda1f873da047133b098ccca42400281a3267440e437bcd8d03bdd73ea4c0e70237c8a06aca54ac7cf03681966c11b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}