{
  "manageEntity": {
    "action": "Save",
    "entityId": "448126147",
    "entityType": "Track",
    "nonce": "1785530531637017356",
    "signature": "0xa6aa9977e45273365dd1cfeeeeb3194e452324207dbd262855bfd7efb66532ed486e29856e43512d9f037677f1c5146d1393af41a5e46736f9e996487ba4c8981b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}