{
  "manageEntity": {
    "action": "Save",
    "entityId": "908917174",
    "entityType": "Track",
    "nonce": "0x13f7d7aebb2103536d6f8191b1b698b81e3235c1f1100283d80275369b1a1759",
    "signature": "0x48429b72e092300cc93e1ae2666102e5432b8b38457b55eb89c4f365c6f1c3c1191062da323b4b25f01f4370e8b0988f049c2abb9a12c1ca2d4bf77827a864431b",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}