{
  "manageEntity": {
    "action": "Save",
    "entityId": "199138991",
    "entityType": "Track",
    "nonce": "0xb6d172d61618cb99cbf4e23362ffb45eb2a2c1dc0964a4b9cc245a1a4357864e",
    "signature": "0x4b1bce5eff0811901eacdd7d8222b6a8be3fa76aafbbc306b3650639addb81e421742ab1ee61cae9a7a20d966d005437751bb81daf4f5feda9835f775dc5d27a1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}